[1] NIH, Natl Inst Allergy & Infect Dis, Bethesda, MD 20892 USA
[2] US FDA, Ctr Biol Evaluat & Res, Rockville, MD 20852 USA
[3] SUNY Stony Brook, Sch Med, Dept Mol Genet & Microbiol, Stony Brook, NY 11794 USA
[4] Russian Acad Med Sci, Inst Poliomyelitis & Viral Encephalitis, Moscow 142782, Russia