Using primers directed against the thymidine kinase gene of vaccinia v
irus, PCR products were generated from nucleic acids extracted from ra
ccoon poxvirus-infected Vero cells. The PCR products were consistent i
n size with the expected products from vaccinia virus, Nucleotide sequ
ence determination revealed that the raccoon pox thymidine kinase gene
and flanking regions were 84.3% homologous to the corresponding seque
nces of vaccinia virus. At the amino acid level, an open reading frame
coding for a polypeptide of 177 amino acids was found with 87% homolo
gy to thymidine kinase of vaccinia.