期刊
ENVIRONMENTAL RESEARCH
卷 188, 期 -, 页码 -出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.envres.2020.109765
关键词
Drug-resistance; E. coli; Resistant genes; Kelani river; Sri Lanka; India
资金
- Asia Pacific Network (APN) [CRRP 2016-06MY-Kumar]
- Japan Society for the Promotion of Science [18KK0114]
- Indonesian Ministry of Higher Education and Research and Technology scholarship
- Grants-in-Aid for Scientific Research [18KK0114] Funding Source: KAKEN
We evaluate the imprints of urbanization, landuse and lifestyle on the prevalence and provenance of antibiotic resistance in the tropical rivers of Sri Lanka (Kelani and Gin) and India (Sabarmati, and Brahmaputra River). The prevalence of E. coli in the Kelani, Sabarmati, and Brahmaputra Rivers was in the range of 10-27, 267-76,600, and < 50 CFU ml(-1) respectively. Isolated E. coli colonies were subjected to six antibiotics to assess their resistance. We found higher resistance to old generation antibiotics like tetracycline (TC), and sulfamethoxazole (ST) transcends the resistance for fluoroquinolones like norfloxacin (NFX), ciprofloxacin (CIP), and levofloxacin (LVX). Interestingly, both Indian rivers had exhibited relatively higher resistance to TC and ST than the Kelani river or Gin River, implying that the Sri Lankan situation is relatively less critical. At genetic level the resistance for beta-lactams, fluoroquinolones and sulphonamides, were detected in many samples, as reported globally. While the resistance genes for aac-(6')-1b-cr, qnrS and sul1 were detected in both Sri Lankan and Indian Rivers, bla(TEM) and ampC were specific to the Indian Rivers only. Decoupling of the prevalence of metal contamination and antibiotic resistance has been noticed in India and Sri Lanka. Study implies that urbanization, landuse, and lifestyle (ULL) are the three most critical factors governing multidrug resistance (MDR) and fecal contamination.
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