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Methicillin-resistant Staphylococcus aureus (MRSA) presents a critical public health threat, arising from its capacity to resist β-lactam antibiotics due to acquisition of the mecA gene within the staphylococcal cassette chromosome mec (SCCmec). This gene encodes penicillin-binding protein 2a (PBP2a), which impairs binding efficacy of methicillin and other β-lactams. MRSA has evolved into distinct clonal lineages impacting humans and animals alike, reinforcing its significance within...
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Combined interventions are effective in MRSA control.

Elina Jokinen1, Janne Laine, Reetta Huttunen

  • 1From the Department of Internal Medicine, Infectious Disease Unit, Tampere University Hospital , Tampere , Finland.

Infectious Diseases (London, England)
|July 3, 2015
PubMed
Summary

Universal screening and infection control measures effectively contained a methicillin-resistant Staphylococcus aureus (MRSA) epidemic. These strategies led to a significant decrease in hospital-acquired MRSA cases and transmissions.

Keywords:
Epidemichand hygieneinfection controlmethicillin-resistant Staphylococcus aureus (MRSA) in humanssurveillance

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Area of Science:

  • Infectious Diseases
  • Epidemiology
  • Public Health

Background:

  • A significant healthcare-associated epidemic caused by methicillin-resistant Staphylococcus aureus (MRSA) emerged in Finland in 2001.
  • This study investigates the impact of infection control and screening on the MRSA epidemic's trajectory.

Purpose of the Study:

  • To evaluate the effectiveness of infection control and screening practices in managing a large-scale MRSA epidemic.
  • To analyze the trends in MRSA strain types and transmission over a 14-year period.

Main Methods:

  • Calculated hospital-acquired (HA)-MRSA findings from clinical and screening samples.
  • Utilized pulsed-field electrophoresis (PFGE) or spa typing for strain characterization.
  • Monitored strain type distribution in relation to sample type, year, and transmission site, alongside stepwise implementation of interventions and expanded screening.

Main Results:

  • Identified 4118 MRSA cases (3527 HA) from 2001-2014, dominated by a single strain (spa t067).
  • Observed a consistent decrease in HA-MRSA cases from 2011, with a 57% reduction by 2014.
  • Screening samples constituted 71% of HA-MRSA findings; clinical cases decreased upon expanded screening, and increased hand-rub consumption correlated with reduced transmissions.

Conclusions:

  • Universal screening, coupled with other interventions, proved effective in controlling the MRSA epidemic.
  • The declining proportion of the epidemic strain suggests a shift in MRSA epidemiology over time.