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Mrsa, Community Acquired

Mrsa, Community Acquired is a topic covered in the 5-Minute Emergency Consult.

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  • Methicillin-resistant Staphylococcus aureus (MRSA) has historically been a pathogen endemic within healthcare settings, usually affecting the elderly and chronically ill. This strain of S. aureus has been termed “healthcare-associated MRSA” (HA-MRSA).
  • Throughout the past decade, MRSA has become an increasingly common pathogen among younger, healthier populations who do not have a healthcare-related exposure history. This type of MRSA pathogen has been termed “community-acquired MRSA” (CA-MRSA).
  • CA-MRSA is the most common cause of skin and soft tissue infections seen in the ED
  • While CA-MRSA may cause skin and soft tissue infection, it may also lead to severe multisystem disease, including sepsis and necrotizing pneumonia

Geriatric Considerations
HA-MRSA (see below) is a different genotypic form of MRSA that frequently causes morbidity among the elderly, especially those living within extended-care facilities or those with healthcare-related exposures.


  • S. aureus is a gram-positive cocci frequently colonizing the skin
  • MRSA refers to a specific strain of S. aureus that has resistance against the antimicrobial properties of numerous antibiotics, including methicillin
  • Prisoners, athletes, soldiers, children in daycare, IV drug users, and those with prior treatment for MRSA or exposure to MRSA are at highest risk for colonization and subsequent infection.

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Rosen, Peter, et al., editors. "Mrsa, Community Acquired." 5-Minute Emergency Consult, 5th ed., Lippincott Williams & Wilkins, 2016. Emergency Central, emergency.unboundmedicine.com/emergency/view/5-Minute_Emergency_Consult/307685/all/Mrsa__Community_Acquired.
Mrsa, Community Acquired. In: Rosen P, Shayne P, Barkin AZ, et al, eds. 5-Minute Emergency Consult. 5th ed. Lippincott Williams & Wilkins; 2016. https://emergency.unboundmedicine.com/emergency/view/5-Minute_Emergency_Consult/307685/all/Mrsa__Community_Acquired. Accessed April 25, 2019.
Mrsa, Community Acquired. (2016). In Rosen, P., Shayne, P., Barkin, A. Z., Wolfe, R. E., Hayden, S. R., Barkin, R. M., & Schaider, J. J. (Eds.), 5-Minute Emergency Consult. Available from https://emergency.unboundmedicine.com/emergency/view/5-Minute_Emergency_Consult/307685/all/Mrsa__Community_Acquired
Mrsa, Community Acquired [Internet]. In: Rosen P, Shayne P, Barkin AZ, Wolfe RE, Hayden SR, Barkin RM, Schaider JJ, editors. 5-Minute Emergency Consult. Lippincott Williams & Wilkins; 2016. [cited 2019 April 25]. Available from: https://emergency.unboundmedicine.com/emergency/view/5-Minute_Emergency_Consult/307685/all/Mrsa__Community_Acquired.
* Article titles in AMA citation format should be in sentence-case
TY - ELEC T1 - Mrsa, Community Acquired ID - 307685 ED - Rosen,Peter, ED - Shayne,Philip, ED - Barkin,Adam Z, ED - Wolfe,Richard E, ED - Hayden,Stephen R, ED - Barkin,Roger M, ED - Schaider,Jeffrey J, BT - 5-Minute Emergency Consult UR - https://emergency.unboundmedicine.com/emergency/view/5-Minute_Emergency_Consult/307685/all/Mrsa__Community_Acquired PB - Lippincott Williams & Wilkins ET - 5 DB - Emergency Central DP - Unbound Medicine ER -