TABLE 4.

Number of mutations in the 5′-untranslated region-P1 coding region (versus Sabin 2) shared by the isolates^a

Isolate name	No. of mutations shared
	P2S/Mog65-2	P2S/Mog65-3	P2S/Mog66-4
P2S/Mog65-1	2	2	3 + 1
P2S/Mog65-2		2	1
P2S/Mog65-3			1

^aUnderlined numbers correspond to mutations A₄₈₁→G (in the 5′-untranslated region) shared by all four isolates and U₂₉₀₉→C (corresponding to the replacement of Ile₁₄₃ of VP1 by Thr) shared by the isolates P2S/Mog65-1, P2S/Mog65-2, and P2S/Mog65-3. In isolate P2S/Mog66-4, the same U residue mutated into A, resulting in the Ile₁₄₃→Asn change. The total numbers of nucleotide substitutions in the 5′-untranslated region-P1 coding region, compared to the Sabin 2 ancestor, are 18, 6, 22, and 46 for the isolates P2S/Mog65-1, P2S/Mog65-2, P2S/Mog65-3, and P2S/Mog66-4, respectively.