[1] Secretaria Estado Saude Piaui, Inst Doencas Trop Natan Portella, Teresina, PI, Brazil
[2] Fundacao Municipal Saude Teresina, Diretoria Vigilancia Saude, Teresina, PI, Brazil
[3] Inst Evandro Chagas, Programa Posgrad Virol, Ananindeua, PA, Brazil
[4] Secretaria Estado Saude Piaui, Hosp Infantil Lucidio Portella, Teresina, PI, Brazil
[5] Inst Evandro Chagas, Secao Arbovirol & Febres Hemorrag, Ananindeua, PA, Brazil
[6] Inst Evandro Chagas, Secao Virol Geral, Ananindeua, PA, Brazil
[7] Fundacao Municipal Saude Teresina, Hosp Urgencias Teresina Dr Zenon Rocha Filho, Teresina, PI, Brazil