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Table 3

Ability of MI agar, Colilert®, Chromocult coliform® agar, and DC agar with BCIG culture-based methods to detect total coliforms and E. coli from potable water samples

MI agarColilert®Chromocult coliform® agarDC agar with BCIG
(CFU/100 mL)(MPN/100 mL)(CFU/100 mL)(CFU/100 mL)
Total coliform     
 Positive result ([1–9]) 155/635 (24.4%) 176/635 (26.3%) 156/635 (24.6%) 163/635 (25.7%) 
 Positive result (≥10) 267/635 (42.0%) 161/635 (25.4%) 256/635 (40.3%) 186/635 (29.3%) 
 Total 422/635 (66.5%) 328/635 (51.7%) 412/635 (64.9%) 349/635 (55.0%) 
E. coli     
 Total 102/635 (16.1%) 94/635 (14.8%) 110/635 (17.3%) 85/635 (13.4%) 
MI agarColilert®Chromocult coliform® agarDC agar with BCIG
(CFU/100 mL)(MPN/100 mL)(CFU/100 mL)(CFU/100 mL)
Total coliform     
 Positive result ([1–9]) 155/635 (24.4%) 176/635 (26.3%) 156/635 (24.6%) 163/635 (25.7%) 
 Positive result (≥10) 267/635 (42.0%) 161/635 (25.4%) 256/635 (40.3%) 186/635 (29.3%) 
 Total 422/635 (66.5%) 328/635 (51.7%) 412/635 (64.9%) 349/635 (55.0%) 
E. coli     
 Total 102/635 (16.1%) 94/635 (14.8%) 110/635 (17.3%) 85/635 (13.4%) 
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