1 Laboratório de Genética, Instituto Butantan, Secretaria de Estado da Saúde, Avenida Vital Brasil, 1500 Butantã, 05503-900 São Paulo, SP, Brazil.
2 Department of Biology, Naples University Federico II, Via Mezzocannone 16, 80134 Naples, Italy.
3 Institute of Infection, Immunity and Inflammation, College of Medical, Veterinary and Life Sciences, MRC-University of Glasgow Centre for Virus Research, Bearsden Road, Glasgow G61 1QH, UK.