Influence of hydrologic and anthropogenic factors on the abundance variability of enteropathogens in the Ganges estuary, a cholera endemic region

Batabyal, Prasenjit; Einsporn, Marc H.; Mookerjee, Subham; Palit, A.; Neogi, Sucharit Basu; Nair, G. Balakrish; Lara, Rubén

doi:10.1016/j.scitotenv.2013.10.093

Cited by 35 publications

(15 citation statements)

References 24 publications

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“…Rainfall, phosphorus, TSS and turbidity levels were observed to correlate with Campylobacter concentrations, across the estuary, irrespective of the method applied. Relationships between bacteria and these parameters have been previously reported (Gachter et al, 1988 ; McCarthy et al, 2012 ; Batabyal et al, 2014 ). However, the existence of these specific parameter associations has not been demonstrated for Campylobacter spp .…”

Section: Discussionmentioning

confidence: 73%

Environmental monitoring of waterborne Campylobacter: evaluation of the Australian standard and a hybrid extraction-free MPN-PCR method

et al. 2015

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Campylobacter is the leading agent of diarrheal disease worldwide. This study evaluates a novel culture-PCR hybrid (MPN-PCR) assay for the rapid enumeration of Campylobacter spp. from estuarine and wastewater systems. To first evaluate the current, culture-based, Australian standard, an inter-laboratory study was conducted on 69 subsampled water samples. The proposed Most-Probable Number (MPN)-PCR method was then evaluated, by analysing 147 estuarine samples collected over a 2 year period. Data for 14 different biological, hydrological and climatic parameters were also collated to identify pathogen-environment relationships and assess the potential for method specific bias. The results demonstrated that the intra-laboratory performance of the MPN-PCR was superior to that of AS/NZS (σ = 0.7912, P < 0.001; κ = 0.701, P < 0.001) with an overall diagnostic accuracy of ~94%. Furthermore, the analysis of both MPN-PCR and AS/NZS identified the potential for the introduction of method specific bias during assessment of the effects of environmental parameters on Campylobacter spp. numbers.

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Section: Discussionmentioning

confidence: 73%

Environmental monitoring of waterborne Campylobacter: evaluation of the Australian standard and a hybrid extraction-free MPN-PCR method

et al. 2015

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“…In tropical areas with stable temperatures throughout the year, V. cholerae prevalence is affected by the levels of organic material (Batabyal et al, 2014;Pardío-Sedas, 2007). Our results showed that water temperature, chlorophyll a, and salinity had an effect on the V. cholerae non-O1/non-O139 ompWþ density; however, besides these parameters, turbidity was the most important factor influencing the presence of chxA gene in oysters (Fig.…”

Section: Stationsmentioning

confidence: 66%

“…In a warmer climate, salinity and organic nutrient concentration have been reported as key factors for controlling and limiting further cholera outbreaks (Jutla et al, 2011;Singleton, Attwell, Jangi, & Colwell, 1982). Recently, Batabyal et al (2014) recorded a higher abundance of counts of cultivable Vibrio (CVC) (from~10 2 to~10 5 CFU/L) related with an increase with water temperature (17e37 C) and a greater disposal of untreated sewage into the river during the summer months, with a correlation between CVC, turbidity and salinity statistically significant (R ¼ 0.57, P ¼ 0.006, N ¼ 29). Our results suggest a similar trend.…”

Section: Stationsmentioning

confidence: 99%

Seasonal abundance of Vibrio cholerae non O1/non O139 chxA+ in oysters harvested in a coastal lagoon of Mexico's Gulf coast: A seafood safety risk concern

et al. 2015

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“…More specifically, 27% of all reports of water-related outbreaks caused by HEV-1 and HEV-2 have occurred in the north of India (Ganges Valley). Notably, the main source of freshwater in the region, one of the most populated in the world is the Ganges river, which is the third largest river on the planet by discharge and highly polluted 30 . Another geographical region with recurrent occurrence of HEV outbreaks is equatorial Africa including Chad, Central African Republic, Sudan, South Sudan, Ethiopia, Somalia, Kenya and Uganda, among others.…”

Section: Resultsmentioning

confidence: 99%

Population density and water balance influence the global occurrence of hepatitis E epidemics

Carratalà

Joost

2019

Sci Rep

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In developing countries, the waterborne transmission of hepatitis E virus (HEV), caused by HEV genotypes 1 (HEV-1) and 2 (HEV-2), leads to the onset of large recurrent outbreaks. HEV infections are of particular concern among pregnant women, due to very high mortality rates (up to 70%). Unfortunately, good understanding of the factors that trigger the occurrence of HEV epidemics is currently lacking; therefore, anticipating the onset of an outbreak is yet not possible. In order to map the geographical regions at higher risk of HEV epidemics and the conditions most favorable for the transmission of the virus, we compiled a dataset of HEV waterborne outbreaks and used it to obtain models of geographical suitability for HEV across the planet. The main three variables that best predict the geographical distribution of HEV outbreaks at global scale are population density, annual potential evapotranspiration and precipitation seasonality. At a regional scale, the temporal occurrence of HEV outbreaks in the Ganges watershed is negatively correlated with the discharge of the river (r = −0.77). Combined, our findings suggest that ultimately, population density and water balance are main parameters influencing the occurrence of HEV-1 and HEV-2 outbreaks. This study expands the current understanding of the combination of factors shaping the biogeography and seasonality of waterborne viral pathogens such as HEV-1 and HEV-2, and contributes to developing novel concepts for the prediction and control of human waterborne viruses in the near future.

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Influence of hydrologic and anthropogenic factors on the abundance variability of enteropathogens in the Ganges estuary, a cholera endemic region

Cited by 35 publications

References 24 publications

Environmental monitoring of waterborne Campylobacter: evaluation of the Australian standard and a hybrid extraction-free MPN-PCR method

Environmental monitoring of waterborne Campylobacter: evaluation of the Australian standard and a hybrid extraction-free MPN-PCR method

Seasonal abundance of Vibrio cholerae non O1/non O139 chxA+ in oysters harvested in a coastal lagoon of Mexico's Gulf coast: A seafood safety risk concern

Population density and water balance influence the global occurrence of hepatitis E epidemics

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