Colombie (1) Salmonella (1) Water--Pollution (1) Water (1) Enterococcus faecalis (1) Sewage (1) Rivers (1) Quality of products (1) Pseudomonas (1) Pollution (1) Human settlements (1) Droughts (1) Bacteria (1) Aguas superficiales--Contaminación (1) Enterococcus faecalis (1) Estudios (1) Salmonella (1) Pseudomonas (1) Calidad (1) Ríos (1) Bacterias (1) Asentamientos humanos (1) Contaminación (1) Aguas residuales (1) Agua (1) Sequía (1)