Journal
CURRENT OPINION IN MICROBIOLOGY
Volume 10, Issue 5, Pages 428-435Publisher
CURRENT BIOLOGY LTD
DOI: 10.1016/j.mib.2007.08.003
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Funding
- NIAID NIH HHS [R01 AI045738, R01 AI045738-09, 2 RO1 AI045738-08] Funding Source: Medline
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Nothing documents better the spectacular adaptive capacity of Staphylococcus aureus than the response of this important human and animal pathogen to the introduction of antimicrobial agents into the clinical environment. The effectiveness of penicillin introduced in the early 1940s was virtually annulled within a decade because of the plasmid epidemics that spread the beta-lactamase gene through the entire species of S. aureus. In 1960 within one to two years of the introduction of penicillinase resistant beta-lactams (methicillin), methicillin resistant S. aureus (MRSA) strains were identified in clinical specimens. By the 1980s, epidemic clones of MRSA acquired multidrug resistant traits and spread worldwide to become one of the most important causative agents of hospital acquired infections. In the early 2000s, MRSA strains carrying the Tn1546 transposon-based enterococcal vancomycin resistant mechanism were identified in clinical specimens, bringing the specter of a totally resistant bacterial pathogen closer to reality. Then, in the late 1990s, just as effective hygienic and antibiotic use policies managed to bring down the frequency of MRSA in hospitals of several countries, MRSA strains began to show up in the community.
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