Abstract
Climate variables may interfere with the environmental persistence and spread of pathogenic microorganisms. This study aimed to investigate the occurrence of human adenovirus (HAdV) and total and thermotolerant coliforms in treated and untreated water and report gastroenteritis cases in seven cities located in the hydrographic basin of the Sinos River (HBSR), Southern Brazil. The data on water quality from samples collected at catchment areas of HBSR from March to December 2011 were compared with precipitation records, virus detection rates and viral loads, and information on enteric diseases among residents of the region. There was a marked increase in precipitation intensity in April, July, and August and a decrease in May and November. The number of HAdV genome copies (gc) in untreated water ranged from 2.1 × 108 gc/L in June to 7.8 × 101 gc/L in December, and in treated water, from 6.3 × 104 gc/L in September to 4.1 × 101 gc/L in November. The most probable number (MPN) of total coliforms ranged from 5 × 101 MPN/100 mL in December to 2.4 × 105 MPN/100 mL in July, and thermotolerant coliforms ranged from 1 × 101 MPN/100 mL in August to 6.9 × 104 MPN/100 mL in July. A total of 79 hospital admissions due to gastroenteritis were registered in the cities studied. The results for coliforms in untreated water demonstrate deficits in sanitation and wastewater treatment. These findings also indicate a possible relationship between the occurrence of rainfalls after dry periods and an increase in the number of gastroenteritis cases and in HAdV load quantified in surface water collected for conventional potabilization.


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This study was funded by state funding agency Fundação de Amparo à Pesquisa do Rio Grande do Sul (FAPERGS) [grant number 10/1339–2]. Fernando Rosado Spilki is a CNPq research fellow.
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Rodrigues, M.T., Henzel, A., Staggemeier, R. et al. Human adenovirus spread, rainfalls, and the occurrence of gastroenteritis cases in a Brazilian basin. Environ Monit Assess 187, 720 (2015). https://doi.org/10.1007/s10661-015-4917-4
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DOI: https://doi.org/10.1007/s10661-015-4917-4


