Abstract
The presence of antibiotic resistant bacteria was found among standard plate count (SPC) populations of chlorinated drinking water from two districts in Cairo. SPC values obtained were low, ranging between 20 and 3 800 mL−1. Most strains appeared to be ampicillin resistant (89.7%). Those were followed by sulfaguanidine (78.1%) and streptomycin (56.9%). The majority of the tested strains were resistant to two or more antibiotics (multiple antibiotic resistant, MAR) which represent 62.4 to 98 % of the total isolates of the mean obtained in a month. Identification of 363 MAR strains revealed that gram-positive rods were dominant in chlorinated drinking water. Gram-negative fermentative-rods, gram-positive cocci and gramnegative nonfermentative rods represent the second, third and fourth group of the identified MAR phenotypes. The impact of the antibiotic resistant bacteria in drinking water as a health hazard is discussed.
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