**5. Conclusions**

To conclude, this study presented the perceptions, attitudes and practices of healthcare workers related to the COVID-19 pandemic in four COVID-19 Greek hospitals. HCWs were adequately knowledgeable regarding COVID-19 and infection control measures. Certain misconceptions and knowledge gaps in everyday practice were revealed which could promote future interventions, especially in terms of repeated education on hand hygiene and antimicrobial use in COVID-19 patients.

**Supplementary Materials:** The following are available online at https://www.mdpi.com/2414-6 366/6/3/136/s1, Table S1: Medical doctors' specialties, Document S1: Questionnaire regarding knowledge, perceptions, and practice in regards to the COVID-19 pandemic.

**Author Contributions:** Conceptualization, D.P.K.; methodology, P.I., S.K., A.M. and D.P.K.; software, P.I.; validation, P.I., P.P., K.A., G.P. and D.P.K.; formal analysis, P.I.; investigation, A.M., A.S., V.P. (Vasiliki Papakosta), P.P., V.P. (Vasilis Petrakis), D.P., K.A., C.M.T., E.C., G.P., K.N.S., V.R., D.K. and K.L.; resources, D.P.K., G.P., P.P., K.A., D.K. and K.N.S.; data curation, P.I.; writing—original draft preparation, P.I., S.K. and D.P.K.; writing—review and editing, A.M., A.S., V.P. (Vasiliki Papakosta), P.P., V.P. (Vasilis Petrakis), D.P., K.A., C.M.T., E.C., G.P., K.N.S., V.R., D.K. and K.L; visualization, D.P.K.; supervision, D.P.K., P.P., K.A., G.P.; project administration, D.P.K. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research received no external funding.

**Institutional Review Board Statement:** The study was conducted according to the guidelines of the Declaration of Helsinki, and approved by the Institutional Review Board of University Hospital of Heraklion (protocol code 25/07-10-2020).

**Informed Consent Statement:** Informed consent was obtained from all subjects involved in the study.

**Data Availability Statement:** The data presented in this study are available on request from the corresponding author.

**Conflicts of Interest:** The authors declare no conflict of interest.
