Antimicrobial resistance of enterobacteria isolated from water intended for public supply in the Midwest region of São Paulo State, Brazil/Resistência a antimicrobianos de enterobactérias isoladas de águas destinadas ao abastecimento público na região centro-oeste do estado de São Paulo, Brasil
A total of 3,726 water samples from public supply system and collective wells from 62 municipalities were analyzed. Positive samples for total coliforms and/or Escherichia coli were seeded on MacConkey Agar for isolation and identification. Isolated enterobacteria were evaluated for antimicrobial resistance detection and expanded spectrum ?-lactamase production.
RESULTS:
From a total of 67 water samples from 29 municipalities with growth of enterobacteria, 21 (31.34%) were resistant to at least one antimicrobial, seven (10.43%) to two classes of antimicrobials, three (4.47%) to three classes, and one (1.49%) to four classes. The drug with the highest number of resistant bacterial samples was cefoxitin (12), followed by cephalothin (eight), cefotaxime (five), ticarcillin + clavulanate (four), aztreonam (four), nalidixic acid (three), and ampicillin + sulbactam (three). Second generation cephalosporins showed the largest number of resistant bacterial samples (12; 32.43%), followed by penicillins (10; 14.92%), and first generation cephalosporins (8; 25.81%). Three (4.47%) samples were resistant to three classes of antimicrobials and one (1.49%) to four classes.