1. Ministry of Health, Santiago, Chile;
2. Pan American Health Organization, Santiago, Chile; Catholic University of Chile, Santiago, Chile.
3. Centers for Disease Control and Prevention, Atlanta, Georgia, USA;
4. Instituto Nacional de Enfermedades Infecciosas ANLIS "Carlos G. Malbran," Buenos Aires, Argentina;
5. Aysen Region XI Health Service, Coyhaique, Chile;
6. Pan American Health Organization, Santiago, Chile;
7. Coyhaique Regional Hospital, Coyhaique, Aysen, Chile;
8. Llanchipal Health Services, Puerto Montt, Chile;
9. Instituto Nacional de Enfermedades Virales Humanas, Pergamino, Argentina;