642chronic arthritis.5 The virus divides preferentially in rapidly dividing cells particularly erythroid precursors, but by the time the rash appears, viraemia is no longer detectable. This suggests that the neuralgic amyotrophy seen in this patient is due to an idiosyncratic immune response.We recommend serological testing for parvovirus IgM in cases of neuralgic amyotrophy to ascertain the relative causal contribution to this painful and disabling condition. DAVID
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