1. Division of Vector-Borne Diseases, Centers for Disease Control and Prevention, San Juan, Puerto Rico;
2. University of Florida, Gainesville, Florida;
3. University of Georgia, Athens, Georgia;
4. Laboratory of Viral Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland,
5. Ponce Health Sciences University/Ponce Research Institute, Ponce, Puerto Rico