Heterotrophic bacteria resistant to nine antibiotics after different doses of chlorination.

<p>VAN, CEP, SD, ERY, RIF, GEN, TC, CIP, CHL and ERY&TC represent. vancomycin-, cephalexin-, sulfadiazine-, erythromycin-, rifampicin-, gentamicin-, tetracycline-, ciprofloxacin-, chloramphenicol and erythromycin & tetracycline- resistant bacteria, respectively. Error bars indicate standard deviation for replicates from a single sample.