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AAP Grand Rounds 3:32 (2000) Benign Acute Myositis and Influenza Viral InfectionSource: Mackay MT, Kornberg AJ, Shield LK, Dennett X. Benign acute childhood myositis. Laboratory and clinical features. Neurology. 1999;53:21272131.
Thirty-eight children (32 boys, 6 girls) with 41 episodes of myositis occurring between 1978 and 1997 are reported from the Royal Childrens Hospital, University of Melbourne, Australia. Viral studies during 24 of the episodes were positive in 10 (42%), with influenza B isolated in 5 (50%). A typical case was a 7-year-old boy admitted with calf pain and difficulty walking. Fever, cough, and lethargy had preceded the muscle pain by 5 days. He walked on his toes, his calf muscles were tender, and passive ankle dorsiflexion exacerbated the pain. Muscle tone, power, tendon reflexes, and sensation were normal
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