Lupus anticoagulant in a patient with parvovirus B19 infection.

We report the case of a patient who presented with a prodromal illness suggestive of viral infection, subsequently confirmed as parvovirus B19, who had a lupus anticoagulant present. Her IgG anti-cardiolipin antibody was normal (7.0 units/ml) but her IgM anti-cardiolipin was elevated (55 units/ml). These later returned to normal. Parvovirus B19 infection may be associated with the presence of lupus anticoagulant.