1. Detection of Cryptosporidium, Giardia, fecal indicator bacteria, and total bacteria in commercial jar water in the Kathmandu Valley, Nepal.
- Author
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Malla, B., Ghaju Shrestha, G. R., Bhandari, D., Tandukar, S., Shrestha, S., Yoshinaga, H., Inoue, D., Sei, K., Nishida, K., Tanaka, Y., Sherchand, J. B., and Haramoto, E.
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CRYPTOSPORIDIUM , *DRINKING water microbiology , *GIARDIA , *DETECTION of microorganisms , *MEDICAL care - Abstract
Introduction: Jar water is a convenient and common source of drinking water in the Kathmandu Valley. How ever, studies including detailed microbial analyses of this source of potable water are lacking. In this study, jar water samples w ere examined for the occurrence of Cryptosporidium, Giardia, fecal indicator bacteria, and total bacteria. Methods: Thirty di"erent brands of jars w ere collected in September 2014. Escherichia coli and total coliforms w ere determined using a Colilert reagent. Ten of the 30 brands w ere selected to test for Cryptosporidium, Giardia, and total bacteria. Bacterial DNA extraction from w ater samples w as performed using the Cica Geneus DNA Extraction Kit, follow ed by quantitative polymerase chain reaction (qPCR) targeting the 16S rRNA gene of bacterial DNA. Protozoan detection w as accomplished by concentrating the samples using the electronegative membrane vortex method, follow ed by immunomagnetic separation and #uorescent staining. Results: E. coli w as detected in 10% of the samples, with a maximum concentration of 2 most probable number (MPN)/100 mL, w hereas total coliforms w ere detected in 97% of the samples, w ith a maximum and mean concentration of 7.3 $ 102 and 3.8 $ 101 MPN/100 mL, respectively. Total coliforms concentrations in 40% of the samples ranged from 102 to 103 MPN/100 mL. Cryptosporidium and Giardia w ere not detected in any of the tested samples. Concentrations of total bacteria in the samples ranged from 104 to 106 cells/100 mL. Conclusions: Ninety-seven percent of the jar water brands were unsuitable for drinking w ithout proper treatment based on the guideline values of the National Drinking W ater Q uality Standards (NDW Q S) of Nepal. ! ere is no guideline value for total bacteria in NDW Q S how ever, high concentrations can be indicative of poor control on regrow th of bacteria and recontamination or ine& cient w ater treatment methods. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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