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Background:
Systematic Review

Gram-Negative Endogenous Endophthalmitis: A Systematic Review

by
Giorgio Tiecco
1,
Davide Laurenda
1,
Alice Mulè
1,
Stefania Arsuffi
1,
Samuele Storti
1,
Manuela Migliorati
1,
Alessandro Boldini
2,
Liana Signorini
3,
Francesco Castelli
1 and
Eugenia Quiros-Roldan
1,*
1
Department of Clinical and Experimental Sciences, Unit of Infectious and Tropical Diseases, University of Brescia and ASST Spedali Civili di Brescia, 25123 Brescia, Italy
2
Department of Neurological and Vision Sciences, Eye Unit, University of Brescia and ASST Spedali Civili di Brescia, 25123 Brescia, Italy
3
Unit of Infectious and Tropical Diseases, ASST Spedali Civili di Brescia, 25123 Brescia, Italy
*
Author to whom correspondence should be addressed.
Microorganisms 2023, 11(1), 80; https://doi.org/10.3390/microorganisms11010080
Submission received: 19 November 2022 / Revised: 20 December 2022 / Accepted: 24 December 2022 / Published: 28 December 2022
(This article belongs to the Special Issue 10th Anniversary of Microorganisms: Past, Present and Future)
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Review Reports Versions Notes

Abstract

:
Background: Gram-negative bacteria are causative agents of endogenous endophthalmitis (EBE). We aim to systematically review the current literature to assess the aetiologies, risk factors, and early ocular lesions in cases of Gram-negative EBE. Methods: All peer-reviewed articles between January 2002 and August 2022 regarding Gram-negative EBE were included. We conducted a literature search on PubMed and Cochrane Controlled Trials. Results: A total of 115 studies and 591 patients were included, prevalently Asian (98; 81.7%) and male (302; 62.9%). The most common comorbidity was diabetes (231; 55%). The main aetiologies were Klebsiella pneumoniae (510; 66.1%), Pseudomonas aeruginosa (111; 14.4%), and Escherichia coli (60; 7.8%). Liver abscesses (266; 54.5%) were the predominant source of infection. The most frequent ocular lesions were vitreal opacity (134; 49.6%) and hypopyon (95; 35.2%). Ceftriaxone (76; 30.9%), fluoroquinolones (14; 14.4%), and ceftazidime (213; 78.0%) were the most widely used as systemic, topical, and intravitreal anti-Gram-negative agents, respectively. The most reported surgical approaches were vitrectomy (130; 24.1%) and evisceration/exenteration (60; 11.1%). Frequently, visual acuity at discharge was no light perception (301; 55.2%). Conclusions: Gram-negative EBEs are associated with poor outcomes. Our systematic review is mainly based on case reports and case series with significant heterogeneity. The main strength is the large sample spanning over 20 years. Our findings underscore the importance of considering ocular involvement in Gram-negative infections.

1. Introduction

Endogenous endophthalmitis (EE) is a rare but devastating complication of bloodstream infections found in less than 0.5% of patients with fungemia and 0.04% of patients with bacteraemia [1]. When left untreated, endogenous bacterial endophthalmitis (EBE) can damage the eye’s structures, leading to visual impairment and even blindness [2]. From any possible source of infection, the aetiological agent may spread through the bloodstream across the blood–retinal barrier (BRB), eventually reaching the eye structures [2]. Nearly 10% of EBE worldwide are caused by Staphylococcus aureus (S. aureus), which is also the leading cause of EBE in the USA and Europe, comprising approximately 25% of these cases [3].
S. aureus itself can alter BRB tight junctions by disrupting the expression and/or organisation of the ZO-1 protein [4]. In other words, S. aureus possesses the ability to cause EBE regardless of pre-existing vascular leakage [5]. However, other bacteria are involved in the aetiology of EBE: Streptococcus spp. (including viridans group, S. pneumoniae, Streptococcus milleri group and group A and B streptococci), and Gram-negative pathogens such as Escherichia coli and especially Klebsiella pneumoniae represent important causes of EE [1]. A higher rate of endophthalmitis has been reported in patients with hypervirulent K. pneumoniae (hvKp) bacteraemia associated with liver abscesses and prostate involvement [6]. Unlike S. aureus, no intrinsic pathogenic activity has been demonstrated for these bacteria. However, predisposing conditions that might cause damage to the BRB do exist. Diabetes mellitus ranks highest among the comorbidities related to EBE. It is associated with 33% of cases and causes significant permeability alterations in the BRB [4]. Studies in animal models have suggested that an increased BRB permeability could contribute to an increment in bacterial transmigration from the bloodstream into the eye [5].
It is uncertain whether it is necessary to conduct ocular screening for Gram-negative EBEs in day-by-day clinical practice. Literature on EBE consists mostly of case series or single case reports and only a few analyses on humans investigate risk factors for BRB alteration in cases of ocular involvement secondary to Gram-negative bloodstream infections [2]. Lastly, several primary focal ocular lesions might break into and seed the vitreous causing EBE, but these pathogenetic aspects are not well defined, especially for Gram-negative bacteria [7,8,9]. Our primary aim is to systematically review the current literature to properly assess the risk factors, main aetiologies, and early ocular lesions in case of EBE due to Gram-negative bacteria.

2. Methods

Our methods meet the Preferred Reporting Items for Systematic Reviews and Meta-Analysis (PRISMA) updated guideline for systematic review stated in 2020 [10].

2.1. Eligibility Criteria

All articles published in peer-reviewed medical journals between January 2002 and August 2022 regarding EBE during Gram-negative infection were included. We excluded articles regarding non-bacterial EE or EE secondary to Gram-positive infection papers in which data regarding EBE due to a Gram-negative infection were available but impossible to extrapolate. Articles published in non-English languages, pre-print or ahead of print analysis, pre-clinical studies, reviews, systematic reviews, and metanalysis were excluded too.

2.2. Information Sources and Search Strategy

With the assistance of a professional medical librarian at our institution, we determined our process for the literature search. We consulted the United States National Library of Medicine, PubMed (last accessed August 2022), and the Cochrane Controlled Trials (last accessed August 2022). References for this review were identified with the following research terms combination: “endogenous endophthalmitis” AND “gram negative”. As the term “gram negative” was often taken for granted in the title or abstract of articles regarding EBE caused by Klebsiella spp., E. coli, or Pseudomonas spp., we decided to expand our search strategy by also including these combinations: “endogenous endophthalmitis” AND “Klebsiella” OR “Pseudomonas” OR “Escherichia coli” which are considered as the Gram-negative bacteria predominantly involved in EBE [11,12].

2.3. Selection and Data Collection Process

A team of 7 resident doctors in Infectious and Tropical Diseases of the University of Brescia, Italy, read the abstract of each scientific work and independently selected the articles according to the established criteria (SA, DL, MM, AM, SS, GT). A Professor in Infectious and Tropical Diseases and an Ophthalmologist of the ASST Spedali Civili di Brescia, Italy, revised the included and the rejected papers. Then, resident doctors formed two teams: the first one (SA, AM, SS, GT) collected data by considering each selected article full text, while the second group (DL, MM) created a thorough database to revise, compare and synthesise data. An ophthalmologist revised the collection and synthesis of the ophthalmologic data. No automated tools were used.

2.4. Data Items

For each selected article, we collected information regarding the number of patients with an EBE due to a Gram-negative infection, their demographic data (age, sex, and ethnicity), comorbidities, and the number of eyes involved, specifying (when available) if a right/left eye was affected. Aetiological data (Gram-negative bacteria involved, culture type and source of infection), as well as initial ocular lesions and visual acuity were reported. Furthermore, we assessed ocular and systemic complications, medical therapy (anti-Gram-negative topical, intravitreal, or systemic antibiotics along with the addition of steroids) and the eventual surgical approach employed. We reported the general and ocular outcome and of a follow-up visit within the 12 months after discharge had been performed. Missing or unclear data were reported as “non-available”. Similarly, we considered “non-available” data regarding EBE due to a Gram-negative infection but impossible to extrapolate because included in more comprehensive studies concerning endophthalmitis in general.

2.5. Synthesis Methods

All the collected data were reported in a single table that was revised by an independent group. Every column was specifically associated with a different item. In the case of columns with less than 5 records, a grouping of the result was performed: i.e., in the case of poorly represented bacterial species, we preferred grouping them under an “other gram-negative aetiology” column. We limited our study to a descriptive analysis of our findings due to the wide heterogenicity of the articles selected. The percentage calculation was performed in consideration of the number of data available for each specific item. No models to identify the presence and extent of statistical heterogeneity or sensitivity analyses to assess the robustness of the synthesised results were performed.

2.6. Bias and Certainty Assessment

This is a systematic review for which a descriptive analysis has been performed due to the wide heterogenicity of the selected articles. Risk of bias or certainty (or confidence) in the body of evidence was not assessed.

3. Results

3.1. Study Selection and Search Results

A total of 154 papers were identified through our search. We excluded 19 duplicate articles. A further eight analyses were removed as five were systematic reviews or meta-analyses [3,13,14,15,16] and three were pre-clinical sciences papers [17,18,19]. Moreover, two studies were excluded because the full text was unavailable [20,21] and one paper was removed due to a lack of data regarding the peer-revision process of the journal [22]. The remaining 124 articles were assessed for eligibility. Seven were excluded as data regarding EBE due to a Gram-negative infection were available, but impossible to select [23,24,25,26,27,28,29] and two further analyses were removed as they did not fully meet the inclusion criteria [30,31]. Eventually, 115 studies were included, as shown in the following flow diagram (Figure 1).
Most studies were case reports (57, 49.6%) and retrospectively non-randomized (46, 40%). Regarding the geographic distribution of the studies, 58.1% of the articles were from Asia, 13.2% were from Europe, and 9.6% were from America. Study characteristics, patient comorbidities, and aetiologic data included are summarized in Table 1 [32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127,128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,144,145,146].

3.2. Results of Synthesis

A total of 591 patients were included. Considering the available demographic data, patients were prevalently Asian (98/120, 81.7%), male (302/480, 62.9%), and with a median age of 55.6 years old. As shown in Table 2, the most common comorbidities identified were diabetes mellitus (231, 55%), hypertension and other cardiovascular diseases (79, 18.8%), renal diseases (21, 5.0%), and malignancies (19, 4.5%).
Overall, 592 infected eyes were involved, with a higher percentage of monocular EBE (429, 83.1%) than binoculars (67, 13%). Focusing on the available data, right eyes (277, 53.7%) were more involved than left eyes (239, 46.3%).
A total of 772 Gram-negative bacteria were included. As shown in Figure 2, Klebsiella pneumoniae (510, 66.1%) was the most common pathogen isolated in the case of Gram-negative EBE, followed by Pseudomonas aeruginosa (111, 14.4%), Escherichia coli (60, 7.8%), and Haemophilus influenzae (11, 1.4%).
These pathogens were isolated both from non-ocular (387, 42.5%) and ocular samples (286, 57.5%). More specifically, the microbiological diagnosis was prevalently performed on vitreous culture (239, 83.6%) and blood cultures (273, 70.5%) when considering the overall number of ocular and non-ocular samples, respectively. As shown in Table 3, liver abscesses (266, 54.5%) represented the predominant primary source of infection of the described EBEs, followed by bloodstream infections/sepsis (116, 23.8%), pneumonia (37, 7.6%), and abdominal infections (37, 7.6%).
Overall, 270 initial ocular lesions were described. Vitreous opacity (134, 49.6%) and hypopyon (95, 35.2%) were the most commonly reported distinctive signs of EBE (Table 4). At the patient’s hospital admission, HM or hand motion (84, 25.4%) and LP or light perception (66, 19.9%) were the most frequently described visual acuities. Ocular complications were uncommon: bulbar atrophy (24, 10.9%), retinal detachment (13, 5.9%), and perforation (12, 5.5%) were the most prevalent. The most frequent systemic complications were septic emboli (4, 2.0%) and central nervous system infections (3, 1.5%).
Few studies reported accurate therapeutic information regarding the antibiotics used and their route of administration. Ceftriaxone (76, 30.9%) was the most widely used anti-Gram-negative systemic antibiotic agent, while fluoroquinolones (14, 14.4%) and ceftazidime (213, 78.0%) were prevalently administered as topical or intravitreal agents, respectively. Only 25 studies appropriately reported antimicrobial therapy’s duration, with an overall mean duration of 39.2 days (range 13 to 84 days). Few patients (69, 28.3%) needed concomitant steroids in addition to the ongoing antimicrobial regimen. Regarding the surgical approach, the most frequently reported techniques were vitrectomy (130, 24.1%) and evisceration/exenteration (60, 11.1%).
Regarding the clinical outcomes at the end of the hospitalization, most patients were discharged (238, 85%), and mortality was recorded in only 15 cases. A higher percentage of NLP or no light perception (301, 55.2%) was reported as final ocular outcome compared to the initial visual acuity assessed. Only 25 studies reported follow-up information, and only five relapses occurred within 12 months after discharge.

4. Discussion

This systematic review estimates the clinical and epidemiological impact of Gram-negative EE, by analysing over a hundred papers spanning 20 years. EBEs, defined as the infection of intraocular tissues resulting from the hematogenous spread of bacteria to the eye, are both a diagnostic and therapeutic challenge for ophthalmologists and infectious diseases specialists [67]. Gram-negative EBEs are an undoubtedly consistent clinical reality associated with poorer outcomes due to the production of endotoxins and the phagocytosis-resistant capsules conferring greater virulence [67,147].
Our search shows that, in East Asian nations, many EBEs are caused by Gram-negative bacilli, including Klebsiella pneumoniae and Escherichia coli [1]. Studies from Singapore and Taiwan showed that up to 70% of the organisms isolated from patients with EBE were Gram-negative [67]. Similarly, other analyses reported frequencies ranging from 22.2% to 77.1%, considering Gram-negative as causative agents of EBE [147]. Interestingly, Klebsiella was found to be the most common causative organism (31.7%-87.6%) followed by Pseudomonas aeruginosa [147].
In our systematic review, Klebsiella pneumoniae was the most common pathogen isolated, while liver abscesses represented the primary source of infection. Indeed, the association of liver abscesses with Klebsiella as the causative organism is observed worldwide, especially when considering hypervirulent strains (hvKp) [6]. Although the mortality rate of hvKp liver abscess is relatively low compared to that associated with pyogenic liver abscesses caused by bacteria other than K. pneumoniae, hvKp infection can lead to metastatic complications that cause significant morbidity such as, for instance, EBE [15]. Most hvKp infections are community-acquired, often afflicting individuals without any predisposing medical condition [15]. The incidence of hvKp infections seems to be rising both in Asia and Europe, and this can be explained by the rates of hvKp-carriers that range from 19% to the alarming percentage of 88% of healthy Chinese adults [15,148]. In a recent systematic review, 1 out of 22 patients with Klebsiella pneumoniae pyogenic liver abscess was found to develop EBE. This is explained by the K antigen, a capsular polysaccharide and a well-established virulence factor that makes K1 serotype infection an independent risk factor for the development of EE [15].
Although cases of EBE have been reported in otherwise healthy and immunocompetent people, EBEs are frequently associated with many systemic risk factors, including chronic immune-compromising illnesses, immunosuppressive diseases or therapies, recent invasive surgery or gastrointestinal procedures, hepatobiliary tract infections, and intravenous drug use [67]. Diabetes is the primary underlying condition associated with EBE (46–63.86%) in Asia. Considering the current scenario of the COVID-19 pandemic, the heavy use of systemic corticosteroids can predispose patients to the subsequent development of EBE via steroid-induced diabetes [147,149]. Although the pathogenic mechanism is poorly understood, it is known that poor glycaemic control might impair neutrophilic hepatic Kupffer cells’ phagocytosis against the bacterial infiltrators arriving with portal blood [15]. A recent review of case series published between 2011 and 2020 stated that while diabetes mellitus remains one of the medical conditions most frequently associated with EBE, malignancies and intravenous drug use represent significant risk factors too [11]. Malignancies were thought to be prevalently associated with endogenous mould endophthalmitis, where Aspergillus spp. and Fusarium spp. were the major pathogens involved [1]. However, malignancies have also been found to be a risk factor in the case of Streptococcus spp., Pseudomonas spp., and Candida spp. endogenous endophthalmitis [11]. In our systematic review, while malignancies are well represented, a small percentage of intravenous drug use is reported. This is consistent with the current literature, since the majority of EBE in people who inject drugs are caused by Gram-positive rather than Gram-negative agents [150].
In our study, vitreous opacity and hypopyon were EBE’s most described initial lesions. However, eye redness (91, 33.8%) alone or together with other ocular signs was commonly reported. This finding, together with the not always severely compromised visual acuity, enlightens the need for ophthalmologists to maintain high suspicion for EBE in patients with intraocular inflammation and significant medical comorbidities [67]. Patients with EBE usually present acutely, complaining only about decreased vision and eye pain [1]. Systemic complications or more alarming local signs such as hypopyon or vitritis might be absent during the initial evaluation [1].
The treatment of EBE should include both ocular and systemic therapy. This is a pharmacokinetic consequence, since most antimicrobial agents have a poor penetration capacity into the avascular vitreous cavity when parenterally administered [67]. Therefore, intravitreal injections are the treatment of choice for EBE. In line with our findings, the most commonly used antimicrobials for empiric treatment are third generation cephalosporines for Gram-negative microorganisms, followed by amikacin and gentamicin, which were mostly used in combination regimens [151]. The notorious Endophthalmitis Vitrectomy Study, a randomized clinical trial conducted between 1991 and 1994, stated that 89.5% of Gram-negative organisms causing endophthalmitis were susceptible to both amikacin and ceftazidime [152]. Although the emergence of multidrug-resistant bacteria is a global issue, the antibiotic susceptibility patterns of Gram-negative bacteria from vitreous isolates have not significantly changed in the United States [152].
The role of additional steroids in EBE management is controversial. A recent study in the Cochrane Library states that the currently available evidence on the effectiveness of adjunctive steroid therapy versus antibiotics alone in managing acute endophthalmitis after intraocular surgery is inadequate [153]. A combined analysis of a very limited number of studies suggests that adjunctive steroids might provide a higher chance of having a better visual outcome at three months [153]. Moreover, another study shows a higher rate of enucleation/evisceration in patients who did not receive steroid therapy [147]. These controversial findings match the differences in clinical approaches to EBE management and treatment revealed by our systematic review, where just a few patients were treated with steroids in addition to the ongoing antimicrobial regimen.
Adequate source control is often warranted in the case of EBE. Surgical intervention is generally recommended for patients infected with virulent organisms, with bilateral involvement, severe vitreous involvement, and progressive worsening [67]. Our systematic review shows that vitrectomy is the most often used surgical procedure as it helps in removing infectious organisms, toxins, and inflammatory cells from the vitreous cavity, thus leading to a better diffusion of antibiotics and a faster recovery [147]. Vitrectomy has several clinical and diagnostic implications: it might save eyes with EBE and restore vision while also providing a higher diagnostic yield compared to a vitreous biopsy, thus helping identify the causative organism [147].
Prognosis is poor in cases of Gram-negative EBE. Despite aggressive therapy, often necessitating surgical intervention, the poor clinical outcome in the case of EBE might be related to a delay in the diagnosis and treatment or the absence of worldwide shared guidelines [15]. Although several factors are associated with the visual outcome, a central role seems to be played by the pathogen involved. A recent study reported that very poor visual acuity (20/400 or worse) is associated with several Gram-negative pathogens such as H. influenzae (69%), Serratia spp. (70%), and Pseudomonas spp. (92%) [1]. Although not uniformly observed across all studies, it has been hypothesized that Gram-negative EE’s poorer outcome could be linked to both Gram-negative endotoxin production and the presence of a phagocytosis-resistant capsule [147].
The findings of this systematic review should be seen in the light of some limitations. First, our research strategy includes a selection bias that cannot be eliminated. Indeed, by including the three main EBE aetiologies, “Klebsiella”, “Escherichia coli”, and “Pseudomonas” in the initial search, it is subordinate that their prevalence will be found to be higher. However, the selection of these species allowed the authors to consider more papers that would have otherwise been wrongfully excluded. Secondly, our systematic review is based on many case reports and case series, with only one prospective study and no RCTs. Consequently, the inclusion of retrospective studies describing aggregate data makes it hard to select data for each patient individually. Lastly, the heterogeneity of the studies included in the absence of methods to assess the risk of bias or certainty in the body of evidence restricted our review to descriptive analysis. Therefore, we limited our comprehensive analysis to a descriptive evaluation of the past 20 years’ literature on Gram-negative EBE. On the other hand, the main strength of this systematic review is the large sample size. In addition, as it was noted during the search phase that most of the scientific output on the subject is produced by ophthalmologists, this systematic review presented Gram-negative EBEs from an infectious diseases specialist’s point of view.

5. Conclusions

Although the literature on EBE mainly comprises case series or single case reports, Gram-negative EBE is an undoubtedly consistent clinical reality associated with poorer outcomes due to virulence and pathogenetic aspects of the Gram-negative’s structure. Klebsiella pneumoniae is the most common causative pathogen in Gram-negative EBE, especially in the Asian population or diabetic people. Although in our study vitreous opacity and hypopyon were the most often described initial lesions of EBE, eye redness alone or together with other ocular signs was commonly reported. This enlightens the need for ophthalmologists to maintain high suspicion for EBE in patients with intraocular inflammation and significant medical comorbidities. Our findings underscore the importance of considering ocular involvement in the case of Gram-negative infections. In light of an ageing population and considering the concerning phenomenon of Gram-negative antimicrobial resistance, EBEs’ appropriate management remains an open challenge for both ophthalmology and infectious disease specialists.

Author Contributions

Conceptualization, E.Q.-R. and D.L.; writing–original draft preparation, G.T., D.L., A.M., S.A., S.S., M.M. and E.Q.-R.; methodology, G.T., D.L., A.M., S.A., S.S., M.M. and E.Q.-R.; software, G.T., D.L., A.M., S.A., S.S., M.M. and E.Q.-R.; validation, G.T., D.L., A.M., S.A., S.S., M.M. and E.Q.-R.; investigation, G.T., D.L., A.M., S.A., S.S., M.M. and E.Q.-R.; resources, G.T., D.L., A.M., S.A., S.S., M.M. and E.Q.-R.; data curation, G.T., D.L., A.M., S.A., S.S., M.M. and E.Q.-R.; writing—review and editing, G.T., D.L., A.M., S.A., S.S., M.M., A.B., L.S., F.C. and E.Q.-R.; visualization, G.T., D.L., A.M., S.A., S.S., M.M., A.B., L.S., F.C. and E.Q.-R.; supervision G.T., D.L., A.M., S.A., S.S., M.M., A.B., L.S., F.C. and E.Q.-R. All authors have read and agreed to the published version of the manuscript.

Funding

This research received no external funding.

Institutional Review Board Statement

Not applicable.

Informed Consent Statement

Not applicable.

Data Availability Statement

Not applicable.

Conflicts of Interest

The authors declare no conflict of interest.

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Microorganisms 11 00080 g001 550
Figure 1. Search strategy and selection process flow-chart.
Figure 1. Search strategy and selection process flow-chart.
Microorganisms 11 00080 g001
Microorganisms 11 00080 g002 550
Figure 2. Prevalent aetiology found in this systematic review. Each pathogen included in the “Other” group represents less than 1% of the aetiology reported. Klebsiella spp. = Klebsiella other than K. pneumoniae.
Figure 2. Prevalent aetiology found in this systematic review. Each pathogen included in the “Other” group represents less than 1% of the aetiology reported. Klebsiella spp. = Klebsiella other than K. pneumoniae.
Microorganisms 11 00080 g002
Table
Table 1. Summary table regarding study characteristics, aetiologic data and patients’ comorbidities.
Table 1. Summary table regarding study characteristics, aetiologic data and patients’ comorbidities.
CountryPatientsAetiologySource of InfectionComorbiditiesN° of Eyes (n° RE, n° LE)Monocular/BinocularSurgeryReference
Taiwan48Klebsiella pneumoniae 31
Pseudomonas aeruginosa 11
Escherichia coli 2		Pneumonia 2
Other 20		Diabetes mellitus 32
Hypertension 21
Renal disease 7
Cirrhosis 6
HIV 2
Malignancy 1		48
(RE 24 LE 24)		Monocular 48Vitrectomy 6
Enucleation 18		[32]
Palestine2Klebsiella pneumoniae 2NADiabetes mellitus 2
Malignancy 1		2
(RE 1 LE 1)		Monocular 2NA[33]
China15Klebsiella pneumoniae 13
Escherichia coli 1		Liver abscess 8
Other 6
Pneumonia 4		Diabetes mellitus 1416
(RE 9 LE 7)		Monocular 14
Binocular 1		Evisceration 8[34]
China4Klebsiella pneumoniae 4NANA4
(RE 2 LE 2)		Monocular 4NA[35]
Thailand13Klebsiella pneumoniae 7
Other 4
Escherichia coli 1
Pseudomonas aeruginosa 1		NANANANANA[36]
India3Klebsiella pneumoniae 1
Pseudomonas aeruginosa 1
Haemophilus influenzae 1		NANANANANA[37]
IranNAKlebsiella pneumoniae 14
Escherichia coli 9
Pseudomonas aeruginosa 6		NANANANANA[38]
AustraliaNAKlebsiella pneumoniae 9
Escherichia coli 1
Pseudomonas aeruginosa 1		NANANANANA[39]
IndiaNAOther 28
Pseudomonas aeruginosa 15
Escherichia coli 8
Haemophilus influenzae 7
Klebsiella pneumoniae 6		NANANANANA[40]
China10Klebsiella pneumoniae 10Liver abscess 4
Pneumonia 2
BSI/Sepsis 5
Other 1		Diabetes mellitus 5
Malignancy 2
Cardiovascular disease 1
Other 2
Chronic hepatitis 2		10
(RE 7 LE 3)		Monocular 10Vitrectomy 3
Evisceration 2
Exenteration 1		[41]
Nepal2Pseudomonas aeruginosa 2NANANANANA[42]
China9Klebsiella pneumoniae 8
Other 1		Liver abscess 16NANANANA[43]
TaiwanNAKlebsiella pneumoniae 44
Escherichia coli 9
Other 4
Pseudomonas aeruginosa 6
Haemophilus influenzae 1		NANANANANA[44]
Thailand14Klebsiella pneumoniae 9
Escherichia coli 3
Pseudomonas aeruginosa 2		Pneumonia 1
Other 7		Diabetes mellitus 7
Cirrhosis 2
Hypertension 1
Renal disease 1		14
(RE 9 LE 5)		Monocular 14Vitrectomy 7
Enucleation 1		[45]
Turkey2Pseudomonas aeruginosa 1
Other 1		NANANANANA[46]
Hong Kong19Klebsiella pneumoniae 12Liver abscess 18
BSI/Sepsis 18
Pneumonia 3
Other 4		Diabetes mellitus 10
Chronic hepatitis 3		24
(RE 10 LE 14)		Monocular 14
Binocular 5		Vitrectomy 3
Evisceration 9		[47]
Taiwan48Klebsiella pneumoniae 48Liver abscess 33
Pneumonia 2
Other 6		Diabetes mellitus 34
Hypertension 17
Malignancy 7
Chronic hepatitis 4		10
(RE 2 LE 8)		Monocular 8
Binocular 1		Vitrectomy 2
Enucleation 1
Evisceration 1		[48]
Taiwan9Escherichia coli 3
Other 3
Pseudomonas aeruginosa 2		NADiabetes mellitus 4
Hypertension 4 Malignancy 2
Drug abuse 1		58
(RE 27 LE 31)		Monocular 38
Binocular 10		Vitrectomy 18
Enucleation 1
Evisceration 11		[48]
Taiwan7Klebsiella pneumoniae 3
Pseudomonas aeruginosa 3
Other 1		Pneumonia 1
Other 1		Diabetes mellitus 5
Cirrhosis 1		8
(RE 5 LE 3)		Monocular 6
Binocular 1		Vitrectomy 1
Enucleation 1		[49]
Taiwan14Klebsiella pneumoniae 12
Escherichia coli 1
Pseudomonas aeruginosa 1		Liver abscess 8
Pneumonia 1 Other 2		Drug abuse 114
(RE 10 LE 4)		Monocular 14NA[50]
India8Pseudomonas aeruginosa 6
Other 2		NANA8Monocular 8NA[51]
USA, South KoreaNAKlebsiella pneumoniae 24
Escherichia coli 1
Haemophilus influenzae 1
Other 1		NANA29NAEvisceration 2[52]
Israel1Escherichia coli 1Other 1NANANANA[53]
Iran1Pseudomonas aeruginosa 1NADiabetes mellitus 1NANAEvisceration 1[54]
South Korea8Klebsiella pneumoniae 8Liver abscess 8NANANANA[55]
India9Klebsiella pneumoniae 1
Pseudomonas aeruginosa 3
Other 4		BSI/Sepsis 1NANANAVitrectomy 3
Evisceration 1		[56]
India11Pseudomonas aeruginosa 5
Other 3
Escherichia coli 2		NADiabetes mellitus 4
Gastrointestinal disorders 1
Cirrhosis 1
Chronic hepatitis 1		9
(RE 7 LE 2)		Monocular 9No surgery[56]
USA2Pseudomonas aeruginosa 2BSI/Sepsis 1Other 1
Immunosuppression 1
Malignancy 1		2Monocular 2Enucleation 2[57]
South Korea23Klebsiella pneumoniae 20
Escherichia coli 1
Pseudomonas aeruginosa 1		Liver abscess 17
Pneumonia 2
Other 1		NA23
(RE 14 LE 9)		Monocular 23Vitrectomy 9
Enucleation 1		[58]
India3Pseudomonas aeruginosa 1
Haemophilus influenzae 1
Other 2		NANANANANA[59]
Korea8Klebsiella pneumoniae 8
Escherichia coli 1		Liver abscess 5Diabetes mellitus 4
Hypertension 3
Renal disease 3
None 2
Cardiovascular disease 1
Gastrointestinal disorders 1
Lung diseases 1 Other 1		8
(RE 5 LE 3)		Monocular 8Vitrectomy 2
Enucleation 1		[60]
India14Pseudomonas aeruginosa 8
Other 4
Klebsiella pneumoniae 2		BSI/Sepsis 11Pregnancy complications 3
Gastrointestinal disorders 1		17
(RE 11 LE 6)		Monocular 11
Binocular 3		Vitrectomy 5[61]
South Korea8Klebsiella pneumoniae 6
Escherichia coli 1 Other 1		NANA8Monocular 8NA[62]
South Korea30Klebsiella pneumoniae 30Liver abscess 18
Pneumonia 5
Other 6		Renal disease 2
Diabetes mellitus 12 Cirrhosis 6
Malignancy 3
Alcohol abuse 1		NANANA[63]
Taiwan42Klebsiella pneumoniae 42Liver abscess 42Diabetes mellitus 33
Hypertension 18
Gastrointestinal disorders 8
Other 3		53
(RE 24 LE 29)		Monocular 31
Binocular 11		Vitrectomy 9[64]
Taiwan8Pseudomonas aeruginosa 8NANA9
(RE 5 LE 4)		Monocular 7Binocular 1Evisceration 7[65]
South Korea15Klebsiella pneumoniae 7
Pseudomonas aeruginosa 7
Escherichia coli 1		Liver abscess 3
Pneumonia 2
Other 3		Diabetes mellitus 6
Lung diseases 2
Hypertension 1
Renal disease 1
Chronic Hepatitis 3
Malignancy 1
None 1		15Monocular 15Vitrectomy 8
Evisceration 2		[66]
China1Klebsiella pneumoniae 1Liver abscess 1Diabetes mellitus 11
(RE 1)		Monocular 1No surgery[67]
Taiwan9Klebsiella pneumoniae 8BSI/Sepsis 8
Pneumonia 2		Diabetes mellitus 5
Chronic hepatitis 1 Other 3		10
(RE 5 LE 5)		Monocular 8
Binocular 1		Vitrectomy 1[68]
Singapore5Klebsiella pneumoniae 5Liver abscess 5
BSI/Sepsis 5		Diabetes mellitus 4
Hypertension 1		7
(RE 4 LE 3)		Monocular 3
Binocular 2		Vitrectomy 1[69]
New ZealandNAOther 3NANANANANA[70]
Germany1Other 1NANA1Monocular 1NA[71]
India2Klebsiella pneumoniae 1
Pseudomonas aeruginosa 1		BSI/Sepsis 1Diabetes mellitus 1
Renal disease 1
Chronic hepatitis 1		2
(RE 1 LE 1)		Monocular 2Evisceration 1[72]
Australia1Pseudomonas aeruginosa 1Other 1Diabetes mellitus 11
(LE 1)		Monocular 1Evisceration 1[73]
Taiwan45Klebsiella pneumoniae 45Liver abscess 39
Pneumonia 5 Other 4		NANANANA[74]
Taiwan6Escherichia coli 2
Other 2
Pseudomonas aeruginosa 1		NANA56
(RE 33 LE 23)		Monocular 34
Binocular 11		Vitrectomy 6[74]
USA1Klebsiella pneumoniae 1BSI/Sepsis 1Diabetes mellitus 1
Hemopathy 1		1
(RE 1)		Monocular 10Evisceration 1[75]
Singapore10Klebsiella pneumoniae 10Liver abscess 10Diabetes mellitus 7
Cardiovascular disease 1		10
(RE 7 LE 3)		Monocular 10Vitrectomy 3
Evisceration 2		[76]
United Kingdom7Klebsiella pneumoniae 1
Escherichia coli 4 Other 2		Liver abscess 1
Other 5		Diabetes mellitus 4
Other 1
Renal disease 2
Alcohol abuse 1		7
(RE 4 LE 3)		Monocular 7NA[77]
South Korea7Klebsiella pneumoniae 7Liver abscess 4
BSI/Sepsis 2		Diabetes mellitus 5
Cirrhosis 1		10NAVitrectomy 7[78]
China4Klebsiella pneumoniae 4Liver abscess 4Diabetes mellitus 24
(RE 2 LE 2)		Monocular 4Evisceration 4[79]
Spain1Other 1NADiabetes mellitus 11 (RE 1)Monocular 1No surgery[80]
Spain1Pseudomonas aeruginosa 1BSI/Sepsis 1Immunosuppression 1
Lung diseases 1		1 (RE 1)Monocular 1No surgery[81]
Canada2Klebsiella pneumoniae 2BSI/Sepsis 2
Liver abscess 1
Other 1		Diabetes mellitus 1
Gastrointestinal disorders 1		4
(RE 2 LE 2)		Binocular 2Enucleation 2[82]
Germany, India, Mexico, France2Klebsiella pneumoniae 1
Other 1		Other 1Lung diseases 1
Immunosuppression 1
Other 2		2
(RE 1 LE 1)		Monocular 2Vitrectomy 2[83]
India1Escherichia coli 1Other 1Diabetes mellitus 12
(RE 1 LE 1)		Binocular 1No surgery[84]
China1Klebsiella pneumoniae 1BSI/Sepsis 1Diabetes mellitus 1
Other 1		1
(LE 1)		Monocular 1Vitrectomy 1[85]
Portugal1Klebsiella pneumoniae 1Liver abscess 1NA1
(RE 1)		Monocular 1Vitrectomy 1[86]
USA1Klebsiella pneumoniae 1NADiabetes mellitus 1
Drug abuse 1		1 (RE 1)Monocular 1No surgery[87]
USA1Klebsiella pneumoniae 1Liver abscess 1Chronic hepatitis 11
(LE 1)		Monocular 1No surgery[88]
India1Other 1Other 1NA1
(RE 1)		Monocular 1Vitrectomy 1[89]
India1Klebsiella pneumoniae 1Other 1NA1
(LE 1)		Monocular 1Enucleation 1[90]
Japan2Klebsiella pneumoniae 1Liver abscess 2Diabetes mellitus 1
Other 1		2
(RE 2)		Monocular 2Vitrectomy 3
Enucleation 1		[91]
United Kingdom1Escherichia coli 1Other 1Gastrointestinal disorders 1
Hypertension 1		1 (LE 1)Monocular 1NA[92]
China1Klebsiella pneumoniae 1NADiabetes mellitus 1
Lung disease 1		1
(RE 1)		Monocular 1Vitrectomy 1
Enucleation 1		[93]
India1Klebsiella pneumoniae 1NAChronic hepatitis 11
(LE 1)		Monocular 1NA[94]
USA1Klebsiella pneumoniae 1Liver abscess 1Diabetes mellitus 11
(LE 1)		Monocular 1No surgery[95]
China1Klebsiella pneumoniae 1Liver abscess 1Diabetes mellitus 11
(RE 1)		Monocular 1Vitrectomy 1[96]
Canada1Klebsiella pneumoniae 1Other 1Diabetes mellitus 1
Renal disease 1		1
(LE 1)		Monocular 1Vitrectomy 1[97]
China1Klebsiella pneumoniae 1Other 1Diabetes mellitus 1
Hypertension 1		1
(LE 1)		Monocular 1Vitrectomy 1[98]
India1Klebsiella pneumoniae 1Other 1None 11
(LE 1)		Monocular 1No surgery[99]
South Korea1Klebsiella pneumoniae 1Liver abscess 1None 11
(RE 1)		Monocular 1Vitrectomy 1[100]
South Korea1Klebsiella pneumoniae 1Liver abscess 1None 11
(RE 1)		Monocular 1Vitrectomy 1[100]
India1Other 1BSI/Sepsis 1None 11
(LE 1)		Monocular 1Vitrectomy 1
Evisceration 1		[101]
China1Klebsiella pneumoniae 1NAAlcohol abuse 1
Gastrointestinal disorders 1		1
(RE 1)		Monocular 1Vitrectomy 1[102]
Australia4Klebsiella pneumoniae 4Liver abscess 4
Pneumonia 1
BSI/Sepsis 3
Other 1		Dyslipidaemia 3
Diabetes mellitus 2
Hypertension 1
None 1		6
(RE 3 LE 3)		Monocular 2
Binocular 2		Vitrectomy 4
Enucleation 1		[103]
France1Klebsiella pneumoniae 1Liver abscess 1None 11
(LE 1)		Monocular 1No surgery[104]
USA1Klebsiella pneumoniae 1BSI/Sepsis 1Diabetes mellitus 11
(RE 1)		Monocular 1Enucleation 1[105]
Australia1Escherichia coli 1NADiabetes mellitus 11
(LE 1)		Monocular 1Vitrectomy 1[106]
Saudi Arabia1Other 1Other 1NA1
(LE 1)		Monocular 1Vitrectomy 3[107]
United Kingdom1Other 1NARenal diseases 11
(LE 1)		Monocular 1No surgery[108]
United Kingdom2Klebsiella pneumoniae 2
Pseudomonas aeruginosa 1		Pneumonia 1
Other 1		Diabetes mellitus 1
Renal diseases 1		3Monocular 1
Binocular 1		NA[109]
China1Klebsiella pneumoniae 1Liver abscess 1Diabetes mellitus 11
(LE 1)		Monocular 1Vitrectomy 1[110]
Australia1Klebsiella pneumoniae 1Liver abscess 1Dyslipidaemia 12
(RE 1 LE 1)		Binocular 1Vitrectomy 1[111]
China1Other 1NANA1
(LE 1)		Monocular 1Vitrectomy 1[112]
China1Klebsiella pneumoniae 1Pneumonia 1
BSI/Sepsis 1		Other 1
Chronic hepatitis 1		2
(RE 1 LE 1)		Binocular 1No surgery[113]
India1Klebsiella pneumoniae 1Other 1Pregnancy complications 11
(LE 1)		Monocular 1No surgery[114]
India6Klebsiella pneumoniae 2
Pseudomonas aeruginosa 2		NANANANANA[115]
Japan1Klebsiella pneumoniae 1BSI/Sepsis 1None 12
(RE 1 LE 1)		Binocular 1No surgery[116]
Japan1Klebsiella pneumoniae 1Other 1Other 21
(LE 1)		Monocular 1Vitrectomy 1
Enucleation 1		[117]
United Kingdom1Other 1Other 1None 11
(RE 1)		Monocular 1No surgery[118]
Saudi Arabia1Klebsiella pneumoniae 1Liver abscess 1Diabetes mellitus 11
(RE 1)		Monocular 1Vitrectomy 1
Evisceration 1		[119]
Thailand1Klebsiella pneumoniae 1BSI/Sepsis 1Diabetes mellitus 11
(LE 1)		Monocular 1Vitrectomy 1[120]
Saudi Arabia2Klebsiella pneumoniae 2Liver abscess 2Diabetes mellitus 2
Cardiovascular disease 1
Hypertension 1
Lung diseases 1		3
(RE 1 LE 2)		Monocular 1
Binocular 1		Vitrectomy 1[121]
Croatia1Pseudomonas aeruginosa 1BSI/Sepsis 1Hypertension 1
Cardiovascular disease 1		2
(RE 1 LE 1)		Binocular 1No surgery[122]
Canada1Escherichia coli 1NAHypertension 11
(RE 1)		Monocular 1Vitrectomy 1[123]
Taiwan2Klebsiella pneumoniae 1Other 2Diabetes mellitus 23
(RE 2 LE 1)		Monocular 1
Binocular 1		No surgery[124]
Nepal2Escherichia coli 2NANA2
(RE 2)		Monocular 2NA[125]
Taiwan1Citrobacter spp. 1Other 1NA1
(RE 1)		Monocular 1NA[126]
USA1Klebsiella pneumoniae 1Liver abscess 1None 11
(RE 1)		Monocular 1Enucleation 1[127]
Spain1Other 1Other 1Diabetes mellitus 1
Other 1		1
(LE 1)		Monocular 1Evisceration 1[128]
Belgium1Klebsiella pneumoniae 1Liver abscess 1Diabetes mellitus 11
(RE 1)		Monocular 1No surgery[129]
Thailand1Pseudomonas aeruginosa 1Other 1None 11
(LE 1)		Monocular 1No surgery[130]
Hong Kong1Pseudomonas aeruginosa 1NALung diseases 11
(RE 1)		Monocular 1Enucleation 1[131]
United Kingdom1Pseudomonas aeruginosa 1Other 1NA2
(RE 1 LE 1)		Binocular 1No surgery[132]
Taiwan1Other 1NADiabetes mellitus 11
(RE 1)		Monocular 1No surgery[133]
Thailand1Other 1BSI/Sepsis 1Other 11
(LE 1)		Monocular 1No surgery[134]
Spain1Pseudomonas aeruginosa 1Pneumonia 1None 11
(RE 1)		Monocular 1Enucleation 1[135]
Australia1Klebsiella pneumoniae 1Liver abscess 1None 11
(RE 1)		Monocular 1Enucleation 1
Evisceration 1		[136]
Malaysia1Klebsiella pneumoniae 1Other 1Diabetes mellitus 1
Malignancy 1		1
(LE 1)		Monocular 1Evisceration 1[137]
USA1Pseudomonas aeruginosa 1Other 1Lung diseases 1
Immunosuppression 1		2
(RE 1 LE 1)		Binocular 1Vitrectomy 1[138]
Japan1Klebsiella pneumoniae 1Other 1Diabetes mellitus 11
(RE 1)		Monocular 1No surgery[139]
USA1Pseudomonas aeruginosa 1Pneumonia 1Lung diseases 11
(LE 1)		Monocular 1Vitrectomy 1[140]
Ireland1Pseudomonas aeruginosa 1BSI/Sepsis 1Pregnancy complications 11
(RE 1)		Monocular 1Evisceration 1[141]
China1Pseudomonas aeruginosa 1NALung diseases 11
(RE 1)		Monocular 1Vitrectomy 1[142]
Slovakia1Pseudomonas aeruginosa 1BSI/Sepsis 1Pregnancy complications 12
(RE 1 LE 1)		Binocular 1No surgery[143]
Japan1Klebsiella pneumoniae 1Liver abscess 1None 12
(RE 1 LE 1)		Binocular 2Enucleation 2[144]
USA1Other 1Other 1Other 12
(RE 1 LE 1)		Binocular 1Vitrectomy 2[145]
Taiwan1Klebsiella pneumoniae 1NARenal disease 11
(RE 1)		Monocular 1No surgery[146]
N° Eyes (n° RE, n° LE) = number of eyes involved (number of right eyes involved, number of left eyes involved); BSI/Sepsis = Bloodstream infection/Sepsis.
Table
Table 2. Comorbidities in the selected population.
Table 2. Comorbidities in the selected population.
Comorbidities
Number of studies with available data84
Number of patients included420
Diabetes mellitus (n, %)231 (55.0%)
Hypertension (n, %)72 (17.1%)
Renal disease (n, %)21 (5.0%)
Malignancy (n, %)19 (4.5%)
Chronic hepatitis (n, %)18 (4.3%)
Cirrhosis (n, %)17 (4.0%)
Gastrointestinal disorders (n, %)14 (3.3%)
Lung diseases (n, %)11 (2.6%)
Other Cardiovascular diseases (n, %)7 (1.7%)
Immunosuppression (n, %)5 (1.2%)
Alcohol abuse (n, %)5 (1.2%)
Pregnancy complications (n, %)4 (0.9%)
People who inject drugs (n, %)3 (0.7%)
Other (n, %)29 (6.9%)
Table
Table 3. Source of infection.
Table 3. Source of infection.
Source of Infection
Number of studies with available data81
Number of patients included488
Liver abscess (n, %)266 (54.5%)
Bloodstream infections/sepsis (n, %)116 (23.8%)
Pneumonia (n, %)37 (7.6%)
Abdominal infections (n, %)37 (7.6%)
Urinary tract infections (n, %)26 (5.3%)
Acute bacterial skin and skin structures infections (n, %)8 (1.6%)
Post-surgery or medical procedures (n, %)8 (1.6%)
Other source of infection (n, %)19 (3.9%)
Table
Table 4. Initial ocular lesions.
Table 4. Initial ocular lesions.
Initial Ocular Lesions
Number of studies with available data70
Number of eyes included270
Vitreous opacity (n, %)134 (49.6%)
Hypopyon (n, %)95 (35.2%)
Redness (n, %)91 (33.7%)
Corneal involvement (n, %)66 (24.4%)
Anterior chamber reaction (n, %)46 (16.7%)
Swelling lid (n, %)37 (13.7%)
Retinal lesions (n, %)27 (10.0%)
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Tiecco, G.; Laurenda, D.; Mulè, A.; Arsuffi, S.; Storti, S.; Migliorati, M.; Boldini, A.; Signorini, L.; Castelli, F.; Quiros-Roldan, E. Gram-Negative Endogenous Endophthalmitis: A Systematic Review. Microorganisms 2023, 11, 80. https://doi.org/10.3390/microorganisms11010080

AMA Style

Tiecco G, Laurenda D, Mulè A, Arsuffi S, Storti S, Migliorati M, Boldini A, Signorini L, Castelli F, Quiros-Roldan E. Gram-Negative Endogenous Endophthalmitis: A Systematic Review. Microorganisms. 2023; 11(1):80. https://doi.org/10.3390/microorganisms11010080

Chicago/Turabian Style

Tiecco, Giorgio, Davide Laurenda, Alice Mulè, Stefania Arsuffi, Samuele Storti, Manuela Migliorati, Alessandro Boldini, Liana Signorini, Francesco Castelli, and Eugenia Quiros-Roldan. 2023. "Gram-Negative Endogenous Endophthalmitis: A Systematic Review" Microorganisms 11, no. 1: 80. https://doi.org/10.3390/microorganisms11010080

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