Community-associated methicillin-resistant Staphylococcus aureus in outpatients, United States, 1999-2006

Eili Klein, David L. Smith, Ramanan Laxminarayan

Research output: Contribution to journalArticle

Abstract

Community-associated methicillin-resistant Staphylococcus aureus (CA-MRSA) has become a major problem in US hospitals already dealing with high levels of hospital-associated MRSA (HA-MRSA). Using antimicrobial drug susceptibility data for 1999-2006 from The Surveillance Network, we characterized the relationship between outpatient and inpatient levels of CA-MRSA nationally. In outpatients, the frequency of CA-MRSA isolates has increased >7x during 1999-2006, which suggests that outpatients have become a major reservoir for CA-MRSA. However, contrary to results in other reports, although CA-MRSA increases are associated with decreases in the frequency of HA-MRSA in hospitals, the decreases are only modest. This fi nding suggests that instead of replacing HA-MRSA in the hospital, CA-MRSA is adding to the overall presence of MRSA already found within the hospital population.

Original languageEnglish (US)
Pages (from-to)1925-1930
Number of pages6
JournalEmerging infectious diseases
Volume15
Issue number12
DOIs
StatePublished - Dec 1 2009

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ASJC Scopus subject areas

  • Epidemiology
  • Microbiology (medical)
  • Infectious Diseases

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