Relationship between precipitation, flow, water temperature and soil use with adenovirus contamination in surface water resources 108 concentration followed the same pattern as HAdV-C, i.e., higher concentrations were found for periods of lower flow. The constant presence of HAdV on the analyzed points occurs due to the absence of treatment of cloacal effluents before they were released to the Caí River (FEPAM, 2019). Evaluating the concentration of AdV in relation to the groups proposed in Figure 3(a) (b) and its relation to land use (rural or urban) around the analyzed points, it can be observed that points 1 and 4 classified within the same group, classified as rural. If we analyze the clusters in a larger detail of groupings, points five and six tend to form a single group, classified as urban. However, all other points analyzed do not follow a standard of similarity in relation to land use with the formed groupings. This non-similarity, as shown in figure 4, can be explained by the presence of HAdV-C, HAdV-F and BAdV at most points, independent of them being urban or rural. This can be explained according to a study presented by Schernewski and Jülich (2001) about to the transport of the virus during the course of water. 5. CONCLUSIONS In the present study we investigated the presence of HAdV-C (2 and 5), HAdV-F (40 and 41) and BAdV on the water’s blade of the Caí River, in its lower stretch, correlating precipitation, water temperature, liquid discharge and land use around the sampled points. The research showed results of relevant viral loads compared to others mentioned in the literature, demonstrating the deficit of sewage treatment in the study region. The water body is also used as a transport agent and diluter for domestic sewage and industrial effluents. The entries of these HAdV in the water system are constant over time, while the BAdV is possibly derived from drag contamination, caused near the banks of the river. In this sense, we emphasize the need for actions for the conservation of natural resources, especially water resources, the need for structures for the treatment of sanitary sewage and the adequate and integrated management of the watershed in order to minimize impacts on the environment and, consequently, improve the health of the population.
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