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  • Primary bacterial infection of skeletal muscles
  • Also known as myositis tropicans, more common in tropical settings
  • Temperate climates in immune compromised patients

Clinical Features

  • First stage: localized muscle pain, low grade fevers, vague complaints[1]
    • Localized muscle inflammation without abscess
  • Second stage: Worsening pain, muscle swelling, fever, abscess formation
  • Third stage: Infection dissemination, septic shock


  • Transient bacteremia after minor trauma to muscle group, or vigorous exercise[2]
  • Most commonly Staph Aureus, followed by Strep pyogenes

Risk Factors

  • DM
  • HIV
  • IVDU
  • Renal failure
  • Rheumatoid Arthritis
  • Leukemia
  • Scharschmidt, T. J., Weiner, S. D. and Myers, J. P. (2004) ‘Bacterial pyomyositis’, Current Infectious Disease Reports, 6(5), pp. 393–396.
  • Chauhan, S. (2004) ‘Tropical pyomyositis (myositis tropicans): current perspective’, Postgraduate Medical Journal, 80(943), pp. 267–270.