Human parvovirus B-19: not just a pediatric problem.

Parvoviruses have long been associated with disabling and even fatal illnesses in animals. The discovery of the human parvovirus B-19 in 1975 (1) and subsequent studies of its effects in humans identified this virus as the causative agent of erythema infectiosum ("fifth disease") in children. (2). Erythema infectiosum (EI) is a common, self-limited infectious disorder in children, easily recognized by the classic "slapped cheek" facial erythema and fine reticular rash. Only in the 1980s have further investigations linked HPV B-19 infection with more significant clinical syndromes, among which is an adult polyarthropathy. This presentation in adults is more common than is currently understood and is easily confused with other symmetric polyarthropathies. Recognition and conservative treatment of this disorder are important for the emergency physician, to whom these patients may present.