Included are 33 nt sites where all SVK-aVDPV2 differed from PV2 Sabin, and seven sites where a few strains showed back mutation. This did not always result in reversion at amino acid level because of
The Mahoney strain of poliovirus type 1 (OM) is generally unable to cause paralysis in mice. We isolated a mouse-adapted mutant, PV1/OM-SA (SA), from the spinal cord of a mouse that had been intracere
