gardless of location.
In this study, based on the mean concentration of FCs, the Piray Miní,
Piranay Guazú and Mártires Rivers (17, 19 and 27) were classified as
high risk (CFU 100 ml−1 N 1000) (Fig. 2). The other study sites were
classified as intermediate risk (100 N CFU 100 ml−1 N 1000 ml)