Canine parvovirus, computer illustration. Canine parvovirus type 2 (CPV2) was first recognized in 1978 and spread worldwide in less than two years. It affects dogs and there are two forms of the disease; the more common intestinal form and the rarer cardiac form. A vaccine is available. In viruses, the capsid is the protein shell that encloses the genetic material. It consists of subunits called capsomeres that self-assemble to form the shell seen here. One of the capsid functions is to aid transmission of the viral genetic material into host cells.
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