Table 1. Poliovirus isolates studied.

Isolate no.	Date of isolation	Geographic location	Diagnosis
14	October 23, 1999	Perm, Russia	Poliomyelitis
11264	October 24, 1999	Perm, Russia	Healthy
15763	June 7, 2001	Tjumen, Russia	Poliomyelitis
9457	February 16, 1999	Azerbaijan	Acute flaccid paralysis
14829	February 18, 2001	Buryat Republic	Poliomyelitis