National Institute of Respiratory Diseases ”Ismael Cosío Villegas” - Centre for Research in Infectious Diseases, National Institute of Respiratory Diseases ”Ismael Cosío Villegas” - Centre for Research in Infectious Diseases, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, National Institute of Respiratory Diseases ”Ismael Cosío Villegas” - Centre for Research in Infectious Diseases, National Institute of Respiratory Diseases ”Ismael Cosío Villegas” - Centre for Research in Infectious Diseases, National Institute of Respiratory Diseases ”Ismael Cosío Villegas” - Centre for Research in Infectious Diseases, National Institute of Respiratory Diseases ”Ismael Cosío Villegas” - Centre for Research in Infectious Diseases, Bethesda - MD, Comisión Coordinadora de Institutos Nacionales de Salud y Hospitales de Alta Especialidad, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán - Department of Infectious Diseases, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán and National Institute of Respiratory Diseases ”Ismael Cosío Villegas” - Centre for Research in Infectious Diseases