The 2 subfamilies are called Chordopoxvirinae, which infect vertebrates and are closely related antigenically, and Entomopoxvirinae, which infect arthropods. The Chordopoxvirinae are composed of groups called orthopoxviruses (vaccinia), parapoxviruses, avipoxviruses of birds, and many others that infect sheep, rabbits, and swine. Family Adenoviridae
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