an emergent poxvirus from humans and cattle in rio de janeiro state: cantagalo virus may derive from brazilian smallpox vaccine.the biological properties of poxvirus isolates from skin lesions on dairy cows and milkers during recent exanthem episodes in cantagalo county, rio de janeiro state, brazil, were more like vaccinia virus (vv) than cowpox virus. pcr amplification of the hemagglutinin (ha) gene substantiated the isolate classification as an old world orthopoxvirus, and alignment of the ha sequences with those of other orthopoxviruses indicated that all the isolates represented a single strain of vv, which we have ...200011080491
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