*Escherichia coli* (*E. coli*)

It was the most studied organism (25%) in Nigeria, but had a skewed distribution, with a higher concentration of *E. coli* studies in South West Nigeria and none in the North East and South East (Figure 2). The distribution of the studies revealed that 57 antibiotics were used to test AMR in *E. coli* isolates, with gentamycin, tetracycline, ciprofloxacin, cotrimoxazole, ampicillin, streptomycin, amoxicillin-clavulanic acid, ofloxacin, ceftriaxone, nitrofuran, perfloxacin, amoxicillin, nalidixic acid, chloramphenicol, cefuroxime, ceftazidime, neomycin, and sparfloxacin being the most prominent in descending order, respectively (Figure 4a). All the reports on *E. coli* isolates revealed "no resistance" to Apramycin, cefepime, cefoxitin, ceftiofur, colistin, florfenicol, Imipenem, meropenem, vacomycin, cefazoline, ertapenem, and tigecycline in the studies that incorporated into the panel of antimicrobial tested. The *E. coli* isolates researched showed "very-low resistance" to "no-resistance" levels in some antibiotics: Amikacin, aztreonam, norfloxacin, ofloxacin, tobramycin, cefalotin, ticarcillin clavulanate, and cefpodoxime in all reports that used them. However, all reports had a "very high resistance" level to cloxacillin, penicillin, teicoplanin, and sulphadimidine where they were included. We observed other various patterns of resistance levels to the remaining antibiotics studied (Figure 4a, Figure S13).

#### *Salmonella*

It was the second most studied organism (14%) in all geopolitical zones, except the South East and South South where there were none (Figures 1 and 2). The distribution of the studies revealed that 27 antibiotics were used to test for AMR in *Salmonella* isolates, with a close distribution in the number of appearances of individual antibiotics (Figure 4b). The pattern of resistance reported showed that *Salmonella,* studied in all the reports, had no resistance to apramycin, aztreonam, cefotaxime, ceftiofur, colistin, pefloxacin, and co-trimoxazole. We observed that florfenicol, neomycin, ofloxacin, and spectinomycin, respectively, had 40%, 50%, 50%, and 30% of the report on them to be "very low resistance", but had the remaining 60%, 50%, 50%, and 70% of their reports as the "no resistance" category. Cefalotin and kanamycin had all their reports as the "very low resistance" category. However, all reports on amoxicillin, enrofloxacin, and triple sulphur had "very high resistance". Other various patterns of resistance were observed in the remaining antibiotics studied (Figure 4b, Figure S14).
