Acute myopathy in three brothers.

: Three brothers are reported who presented simultaneously with acute myopathy, which resolved rapidly. Muscle biopsy showed vacuolar degeneration, with no inflammatory changes. An echo virus was grown from the stools of two of them. Their course, together with that of a fourth brother, who had an acute illness with rash, lymphadenopathy and splenomegaly, suggests a possible viral aetiology.