Affiliation: | 1. Pedro Kourí Institute of Tropical Medicine, Autopista Novia del Mediodía Km 61/2, La Lisa, Havana, Cuba 2. Ministry of Health, 23 y O. Vedado, Habana, Cuba 3. Provincial Hygiene, Epidemiology and Microbiology Centre, Habana, Cuba 4. Juan Manuel Marquez Pediatric Hospital, Habana, Cuba 5. Willian Soler Pediatric Hospital, Habana, Cuba 6. Havana Centre Pediatric Hospital, Habana, Cuba 7. Pan-American Health Organization (PAHO/WHO), Habana, Cuba
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