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Methicillin-resistant Staphylococcus aureus: the persistent resistant nosocomial pathogen
1Oregon Health Sciences University School of Medicine, and Hospitals and Clinics, Portland.
Abstract:
Since the first reports of outbreaks in hospitals in the United States, the prevalence of MRSA colonization and infection has increased in acute-care and chronic-care facilities, outpatient clinics, and in the community. Because of the morbidity and mortality associated with MRSA infections, their preventable nature, and the current requirement for treatment with vancomycin, it is reasonable to invest resources into controlling the transmission of MRSA. Transmission occurs primarily from colonized or infected patients to others via the hands of health care personnel. Efforts to prevent the occurrence of new cases are centered around active or passive surveillance to identify the existing patient reservoir of MRSA and the institution of control measures to block transmission from this reservoir. These measures include hand disinfection, barrier precautions, and segregation of colonized patients. Education and feedback of data to medical personnel are also of value. Health care workers with MRSA colonization are associated with transmission only in a minority of instances. Generally, no treatment is indicated. When eradication of the carrier state is warranted, in personnel or in patients, topical mupirocin ointment appears to be the most effective agent for eliminating nasal carriage. When systemic therapy is required for carriage, rifampin in combination with TMP/SMX or may possibly with Novobiocin be used if the isolate is susceptible. Vancomycin is currently the drug of choice to treat infections due to MRSA, but it does not eradicate carriage. New agents to treat MRSA infections are in various phases of clinical trials.
Insights
Methicillin-resistant Staphylococcus aureus (MRSA) is a growing threat in healthcare settings. Controlling MRSA transmission through hand hygiene and isolation is crucial to prevent infections and reduce patient mortality.
Area of Science:
- Infectious Diseases
- Hospital Epidemiology
- Antimicrobial Resistance
Background:
- Methicillin-resistant Staphylococcus aureus (MRSA) prevalence has increased in various healthcare and community settings.
- MRSA infections cause significant morbidity and mortality, necessitating control measures.
- Transmission primarily occurs from colonized/infected patients to others via healthcare personnel hands.
Purpose of the Study:
- To review strategies for controlling MRSA transmission in healthcare facilities.
- To highlight the importance of surveillance and infection control measures.
- To discuss treatment options for MRSA carriage and infection.
Main Methods:
- Review of existing literature on MRSA epidemiology and control.
- Analysis of transmission routes and risk factors.
- Evaluation of current and emerging treatment modalities.
Main Results:
- Active/passive surveillance identifies MRSA reservoirs.
- Hand disinfection, barrier precautions, and patient segregation are effective control measures.
- Topical mupirocin is effective for nasal carriage eradication; vancomycin treats infections but not carriage.
Conclusions:
- Controlling MRSA transmission requires a multi-faceted approach including surveillance and infection control.
- Early identification and management of MRSA reservoirs are key.
- Ongoing research into new agents is vital for combating MRSA infections.