Resumen

DELGADO VARGAS, John; LIZARAZO, Luz Marina; VALDIVIESO, Margoth  y  GARCIA, Diego. Quantitative microbiological risks assessment associated with the consumption of water of Chicamocha river in Boavita-Boyacá. rev.udcaactual.divulg.cient. [online]. 2019, vol.22, n.1, e1187.  Epub 04-Mayo-2019. ISSN 0123-4226.  https://doi.org/10.31910/rudca.v22.n1.2019.1187.

The habitants of the El Terrenal sector of the municipality of Boavita-Boyacá, have no access to the aqueduct service, and use water of the Chicamocha River for preparation of food, housework and personal hygiene. The aim of this study was to evaluate the presence of pathogenic bacteria and protozoa, present in the water body of the Chicamocha River, through a quantitative analysis of microbiological risk (ACRM). For the development of the work, four samples were conducted from April to June 2016, in the margins and center of the river, and a fifth sample of water treated with the plant Opuntia ficus-indica (Tuno). The method of plate count was performed, using selective and differential media for the isolation of Escherichia coli, Salmonella, Enterococcus and the MacMaster technique for the determination of gastrointestinal parasites (PGI). For the analysis of the information the nonparametric statistics of Kruskall Wallis and U-Mann Whitney were used. It was determined that at least one sampling site is statistically different from another for Enterococcus faecium (P = 0.000) and the oocysts of Entamoeba histolytica (P = 0.000). In contrast, for Escherichia coli no significant differences were observed between the zones, but if at least one sampling date was statistically different (P =0.026) to another. In the treated water there was a decrease in the oocysts of E. histolytica and an increase in the percentage of E. faecium (P= 0,035).

Palabras clave : contaminated water consumption; Escherichia coli; Salmonella typhi; Enterococcus faecium; Entamoeba histolytica..

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