1. Cornell University, Veterinary Diagnostic Laboratory, Ithaca, New York, USA;
2. U.S. Department of Agriculture (USDA), Veterinary Services, Frankfort, Kentucky, USA;
3. USDA, National Veterinary Services Laboratories, Ames, Iowa, USA;
4. Centers for Disease Control and Prevention, Fort Collins, Colorado, USA;
5. New York City Department of Health, New York City, New York, USA;
6. Arbovirus Research Laboratory, Wadsworth Center, Albany, New York, USA