1. Laboratory of Molecular Virology, Center for Biologics Evaluation and Research, U.S. FDA, Bethesda, Maryland 20852.
2. Product Testing Section, Division of Emerging and Transfusion Transmitted Diseases, Center for Biologics Evaluation and Research, U.S. FDA, Bethesda, Maryland 20852.
3. Mobile Laboratory, Sanitation and Hygiene, Administration of Health, Cameroon.