Impact of Wastewater from Different Sources on the Prevalence of an- timicrobial-resistant Escherichiacoli in Sewage treatment Plants in South India

Bairy, Indira (2015) Impact of Wastewater from Different Sources on the Prevalence of an- timicrobial-resistant Escherichiacoli in Sewage treatment Plants in South India. Ecotoxicology and Environmental Safety, 115. pp. 203-208.

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Abstract

The sewage treatment plant (STP) is one of the most important interfaces between the human population and the aquatic environment, leading to contamination of the latter by antimicrobial-resistant bacteria.To identify factors affecting the prevalence of antimicrobial-resistant bacteria, water samples were col-lected from three different STPs in South India. STP1 exclusively treats sewage generated by a domestic population. STP2 predominantly treats sewage generated by a domestic population with a mix of hospital effluent. STP3 treats effluents generated exclusively by a hospital. The water samples were collected between three intermediate treatment steps including equalization, aeration, and clarification, in addi-tion to the outlet to assess the removal rates of bacteria as the effluent passed through the treatment plant. The samples were collected in three different seasons to study the effect of seasonal variation.Escherichia coliisolated from the water samples were tested for susceptibility to 12 antimicr bials. The results of logistic regression analysis suggest that the hospital wastewater in flow significantly increased the prevalence of antimicrobial-resistant E. coli, whereas the treatment processes and sampling seasons did not affect the prevalence of these isolates. A bias in the genotype distribution of E. coli was observed among the isolates obtained from STP3. In conclusion, hospital wastewaters should be carefully treated to prevent the contamination of Indian environment with antimicrobial-resistant bacteria.

Item Type: Article
Uncontrolled Keywords: Hospital effluent; Sewage treatment plant; India; Environmental contaminatio;n Antimicrobial resistance; E coli
Subjects: Medicine > MMMC Manipal > Microbiology
Depositing User: KMC Manipal
Date Deposited: 07 Mar 2015 04:08
Last Modified: 07 Mar 2015 04:08
URI: http://eprints.manipal.edu/id/eprint/142105

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