Abstract
The distribution of resistance to ampicillin, chloramphenicol, sulfonamides, tetracycline, and streptomycin among coliform in the
Gomti river water samples was investigated. The coliform populations were isolated on Mac Conky and eosin methylene blue
(EMB) agar plates supplemented with antibiotics. The incidence of resistance among the coliform population varied considerably
in different drug and water sampling sites. Coliform bacteria showed lower drug resistant viable count in sampling site-III
(receiving treated wastewater) as compared to more polluted site-I and site-II. Viable count of coliform population obtained on
both medium was recorded higher against erythromycin from sampling site-III. Lower viable count of coliforms was recorded
against tetracycline in site-II and III. Similar resistance pattern was obtained in the frequency of
E. coli
and Enterobacter species
from all the three sampling sites. Percentage of antibiotic resistant
E. coli
was observed higher than Enterobacter spp among the
total coliforms against all antibiotics tested without Erythromycin and penicillin in site-I and II respectively. Isolates of
E. coli
and
Enterobacter spp. showed their tolerance level (MIC) in the range of 2-100 against the antibiotics tested. Maximum number of
isolates of both genus exhibited their MICs at lower concentration range 2-5µg/ml against ciprofloxacin, tetracyclin and
amoxycillin.