1. Laboratory of Immunology, Department of Microbiological Science, Faculty of Veterinary, Universidad de la República, Montevideo 11600, Uruguay.
2. Laboratory of Embryology and Cellular Differentiation, Hospital de Clínicas de Porto Alegre, Porto Alegre, RS 90035-903, Brazil.
3. Biostatistics, Hospital de Clínicas de Porto Alegre, Porto Alegre, RS 90035-903, Brazil.
4. Laboratory for Vaccine Research, Department of Biotechnology, Instituto de Higiene, Faculty of Medicine, Universidad de la República, Montevideo 11600, Uruguay.
5. Laboratory of Genetics, Faculty of Veterinary, Universidad de la República, Montevideo 11600, Uruguay.