1. Enteric Disease Laboratory, Virology Center, Adolfo Lutz Institute, Sao Paulo 01246-900, Brazil
2. Institute of Tropical Medicine, University of São Paulo, Sao Paulo 05403-000, Brazil
3. Institute of Biological Sciences, Federal University of Pará, Belem 66075-000, Brazil
4. Respiratory Disease Laboratory, Virology Center, Adolfo Lutz Institute, Sao Paulo 01246-900, Brazil
5. Virology Center, Adolfo Lutz Institute, Sao Paulo 01246-900, Brazil