1. Gastroenteritis and Respiratory Viruses Laboratory Branch, Division of Viral Diseases (DVD), National Center for Immunization and Respiratory Diseases (NCIRD), Centers for Disease Control and Prevention, 1600 Clifton Road NE, Atlanta, GA 30329-4027, USA
2. Department of Pediatrics, University of Rochester School of Medicine and Dentistry, 601 Elmwood Avenue, Box 690, Rochester, NY 14642, USA