1. Vaccines Division; Center for Genetic Engineering and Biotechnology; P.O. Box 6162 Playa Havana 11 600 Cuba
2. Virology Department; Tropical Medicine Institute “Pedro Kourí,” Pan American Health Organization/World Health Organization Collaborating Center for the Study of Dengue and its Vector; P.O. Box Marianao 13 Havana 11 600 Cuba