## 3 Results
### (a)  
Figure 2: **(A) The percentage of antibiotic resistance of _E. coli_ isolates (n = 46) from drinking water recorded per phylogeny in connection with the tested antibiotics. AM: ampicillin; AMC: amoxicillin; cicillin/clavulanic acid; CAZ: cefazidime; CFR: cefotaxime; FOVX: cefoxitin; CIP: ciprofloxacin; CN: gentamicin; MEM: meropenem; SXT: trimethoprim/sulfamethoxazole; TE: tetracycline. Antibiotics of the same group classified into groups referred to as A-G: A: AM and AMC; B: CAZ, CFR, CTX, and FOX; C: CIP; D: CN; E: MEM; F: SXT; G: TE. (B) The percentage of antibiotic resistance of coliform isolates (n = 114) from drinking water recorded per genus in connection with the tested antibiotics. AM: ampicillin; AMC: amoxicillin acid; CAZ: ceftazidime; CFM: cefoxime; CFR: cefotaxime; CXM: cefuroxime; FEP: coFeqtime; FOVX: cefoxitin; CIP: ciprofloxacin; CN: gentamicin; IMP: impienem; MEM: meropenem; SXT: trimethoprim/sulfamethoxazole; TE: tetracycline. Antibiotics of the same group classified into groups referred to as A-G: A: AM and AMC; B: CAZ, CFR, CTX, and FOX; C: CIP; D: CN; E: MEM; F: SXT; G: TE. (B) The percentage of antibiotic resistance of coliform isolates (n = 114) from drinking water recorded per genus in connection with the tested antibiotics. AM: ampicillin; AMC: amoxicillin; ciculiar (c)advulanic acid; CAZ: ceftazidime; CFM: cefoxime; CFR: cefotaxime; CXM: cefuroxime; FEP: coFeqtime; FOVX: cefoxitin; CIP: ciprofloxacin; CN: gentamicin; IMP: impienem; MEM: meropenem; SXT: trimethoprim/sulfamethoxazole; TE: tetracycline. Antibiotics of the same group classified into groups referred to as A-G, where Group A: AM and AMC; Group B: CAZ, CFM, CFR, CTX, and FER; FOVX: CIP; Group D: CN; Group E: IMP and MEM; Group F: SXT; Group G: TE. The analysis of resistant coliforms per genus indicated that the highest percentage of isolates exhibiting resistance to any antibiotic belonged to _Enterobacter_ and _Serratia_ (100.0%), followed by _Citrobacter_ (82.1%, 46 of 56) and _Klebsiella_ (72.5%, 37 of 51) (total AMR + MDR; Figure 3B). The AMR/MDR classification of antibiotic resistance for the _E. coli_ phylogroups indicated that 73.9% (34 of 46) and 26.1% (12 of 46) of the isolates were characterized as AMR and MDR, respectively (Figure 3A). The relevant results for coliforms indicated that 96.5% (110 of 114) and 3.5% (4 of 114) of the isolates were characterized as AMR and MDR, respectively (Figure 3B). Regarding the levels of drug resistance, the percentage of _E. coli_ isolates that were resistant in one antibiotic group (AMR1) were 50.0% (23 of 46), in two antibiotic groups (AMR2) 23.9% (11 of 46), in three antibiotic groups (MDR3) 19.6% (9 of 46), and in four antibiotic groups (MDR4) 6.5% (3 of 46) (Figure 3A). The relevant percentages recorded in connection with coliforms were 42.1% (48 of 114) for AMRI, 54.4% (62 of 114) for AMR2, and 3.5% (4 of 114) for MDR3, whereas no MDR4 was detected (Figure 3B). The analysis of drug resistance conducted with reference to antibiotic groups indicated that most AMR and/or MDR isolates of _E. coli_ (78.3%, 36 of 46) or coliforms (93.9%, 107 of 114) exhibited resistance against group A (ampicillin and amoxicillin/clavulanic acid). None of the _E. coli_ isolates exhibited resistance to groups D (gentamicin) and E (meropenem), whereas with regard to coliforms, the antibiotic groups for which resistance was not recorded were groups C (ciprofloxacin), D (gentamicin), E (impienem and meropenem), and F (trimethoprim/sulfamethoxazole), (Figure 2A,B). The MDR3 _E. coli_ isolates studied here were in all the cases resistant to antibiotic group A (ampicillin and amoxicillin/clavulanic acid) with the other two being in decreasing order of frequency antibiotic groups G (tetracycline), F (trimethoprim/sulfamethoxazole), and B (ceftazidime, cefadroxil, cefotaxime, and cefoxitin) or C (ciprofloxacin) (Table 3). The MDR4 _E.