1. Department of Virology and Molecular Biology, St. Jude Children’s Research Hospital, Memphis, Tennessee 381051;
2. M. P. Chumakov Institute of Poliomyelitis and Viral Encephalitides, 142 782 Moscow, Russia2;
3. Department of Microbiology, Jiangxi Medical College, Nanchang 330006, China3;
4. Department of Pathobiological Sciences, School of Veterinary Medicine, University of Wisconsin—Madison, Madison, Wisconsin 537064; and
5. Department of Pathology, University of Tennessee at Memphis, Memphis, Tennessee 381635