1. Cellular and Molecular Parasitology Laboratory1 and
2. Viruses Laboratory, Microbiology Department,2
3. Molecular Microbiology Department, Washington University, St. Louis, Missouri3
4. Chagas’ Disease Laboratory,5 Centro de Pesquisas RenéRachou, FIOCRUZ, and
5. and Biochemistry and Immunology Department,4 ICB, UFMG, Belo Horizonte, Brazil, and