Publication: Comparative persistence of human sewage-specific enterococcal bacteriophages in freshwater and seawater
Issued Date
2018-07-01
Resource Type
ISSN
14320614
01757598
01757598
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2-s2.0-85047226318
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Mahidol University
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SCOPUS
Bibliographic Citation
Applied Microbiology and Biotechnology. Vol.102, No.14 (2018), 6235-6246
Suggested Citation
Namfon Booncharoen, Skorn Mongkolsuk, Kwanrawee Sirikanchana Comparative persistence of human sewage-specific enterococcal bacteriophages in freshwater and seawater. Applied Microbiology and Biotechnology. Vol.102, No.14 (2018), 6235-6246. doi:10.1007/s00253-018-9079-1 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/45120
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Title
Comparative persistence of human sewage-specific enterococcal bacteriophages in freshwater and seawater
Abstract
© 2018, Springer-Verlag GmbH Germany, part of Springer Nature. Enterococcus faecalis bacteria have been recently reported for their ability to host bacteriophages that are specifically from human sewage, suggesting their application to track human fecal contamination in water resources. However, little is known about the survivability of sewage-specific enterococcal bacteriophages in various water matrices under ambient and storage conditions. In this study, bacteriophages that were derived from the Thailand-isolated E. faecalis strains AIM06 and SR14 exhibited morphologies consistent with the Siphoviridae, Podoviridae, and Myoviridae families. Four representative bacteriophages were separately spiked into environmental water samples (n = 7) comprising freshwater and seawater with low- and high-pollution (LF, HF, LS, and HS, respectively) levels, defined according to Thailand Water Quality Standards. All bacteriophages decayed fastest in HS or HF samples at 30 °C, reaching a 5-log10 reduction in 2.2 to 9.8 days, and slowest in LS samples, requiring 8.8 to 23.5 days. The decay rates were 5 to 53 times lower at a storage temperature of 5 °C. HF samples could be stored for as little as 2.5 days to prevent the decay of 50% of the phages. Myoviridae phages decayed faster than Siphoviridae phages and Podoviridae phages in most water matrices at 30 °C. Moreover, the decay rates were 1.8 to 92 times slower in filtered samples, emphasizing a strong role for water constituents, i.e., suspended solids and natural microorganisms, in phage persistence. This study emphasized that differential enterococcal bacteriophage persistence should be considered when planning the monitoring and interpreting of fecal sources by microbial source tracking.