1. Department of Environmental Analysis, Division of Microbiology and Parasitology, Environmental Company of the São Paulo State (CETESB), Av. Prof. Frederico Hermann Jr., 345, São Paulo, CEP 05459-900, Brazil
2. Basic Sanitation Company of the State of São Paulo (SABESP), São Paulo, Brazil
3. School of Public Health, Universidade de São Paulo (USP), São Paulo, Brazil
4. Instituto de Medicina Tropical, Universidade de São Paulo (IMT/USP), São Paulo, Brazil
5. Institute of Biological Sciences, Universidade Federal do Pará (UFPA), Belém, Brazil
6. Department of Microbiology, Immunology and Parasitology, Escola Paulista de Medicina, (UNIFESP), São Paulo, Brazil