What is Parvovirus? Classification of Parvovirus Parvovirus B19  Advertisements Parvovirus B19, or B19 virus, is the causal agent of erythema infectiosum (“fifth disease”; it was fifth of the six identified exanthematous disorders of childhood), a minor viral sickness of children, as well as polyarthralgia–arthritis syndrome in immunocompetent adults. Morphology of Parvovirus B19  B19 viruses manifest … Read more