The type species of YATAPOXVIRUS, a tumor-producing DNA virus discovered in monkeys in Yaba, Nigeria. It has been found to produce histiocytomas in monkeys and humans.
A subfamily of the family POXVIRIDAE, containing eight genera comprising all the vertebrate poxviruses.
The type species of BETARETROVIRUS commonly latent in mice. It causes mammary adenocarcinoma in a genetically susceptible strain of mice when the appropriate hormonal influences operate.