作者单位:Centers for Disease Control and Prevention, Atlanta, GA, United States[1]Institute of Biomedical Sciences, University of Sao Paulo, Sao Paulo, SP, Brazil, Genomic Molecular[2]Institute of Biomedical Sciences, University of Sao Paulo, Sao Paulo, SP, Brazil[3]Instituto Pasteur de S?o Paulo, Av. Paulista, 393 Paraíso, S?o Paulo, SP, CEP 01311000, Brazil[4]