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Infection with human parvovirus B19 is known to cause aplastic crises in patients with homozygous sickle-cell disease. We studied the haematological consequences of parvovirus B19 infection in 280 such patients who had been followed up from birth in Jamaica. Evidence of seroconversion was routinely sought with a baculovirus-based, enzyme immunoassay in serum samples taken during aplastic crises and...