Affiliation: | Instituto de Investigaciones en Salud (INISA), Universidad de Costa Rica, National Institute of Allergy and Infectious Diseases, Bethesda, Maryland, USA;Ministerio de Salud, San José, Costa Rica, National Institute of Allergy and Infectious Diseases, Bethesda, Maryland, USA;Laboratory of Infectious Diseases, National Institute of Allergy and Infectious Diseases, Bethesda, Maryland, USA |