Characterization of a virus that causes transient aplastic crisis.

Transient aplastic crisis in children with congenital hemolytic anemias has been linked epidemiologically to infection with a serum parvovirus-like virus (SPLV). The virus is found in the blood in the early stages of the crisis, and serum containing SPLV inhibits erythroid colony formation in vitro. After sedimentation of virus-containing sera through a sucrose density gradient, colony inhibitory activity is present in the particulate fraction and separate from serum immunoglobulins. No inhibitory activity can be recovered from convalescent-phase sera after similar fractionation procedures. Inhibition of erythroid colony formation in vitro is not a feature of sera from other viral infections. The pattern of resistance of SPLV activity to chemicals and enzymes is compatible with it being a parvovirus. By using replating techniques, a target of SPLV has been identified as a late erythroid progenitor cell. Neither SPLV antigen nor anti-SPLV IgM was present in the sera of patients with other forms of bone marrow failure.

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