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Outbreak of methicillin-resistant Staphylococcus aureus infection in a New Zealand hospital
1Department of Laboratory Services, Wellington Hospital.
Abstract:
During a 17 month period from March 1985 to July 1986, 30 patients and four members of staff became infected or colonised with a single strain of methicillin-resistant Staphylococcus aureus (MRSA) during an outbreak which originated at Wellington Hospital. Initially, crossinfection occurred within the intensive care unit but infected or colonised patients became distributed to 14 hospital wards and to five other hospitals within New Zealand. MRSA septicaemia contributed to the death of two patients. The source of the epidemic strain of MRSA has not been established with certainty, but may have been introduced by a staff nurse known to be a carrier when employed at an Australian hospital. The investigation, management and eventual control of this first outbreak in New Zealand are described.
Insights
A methicillin-resistant Staphylococcus aureus (MRSA) outbreak infected 34 people across 14 hospital wards and five other hospitals in New Zealand. The investigation details the management and control of this significant hospital-acquired infection event.
Area of Science:
- Infectious Diseases
- Hospital Epidemiology
- Microbiology
Background:
- A significant outbreak of methicillin-resistant Staphylococcus aureus (MRSA) occurred in New Zealand.
- The outbreak involved both patients and healthcare staff, highlighting the contagious nature of MRSA.
Purpose of the Study:
- To investigate and describe the first major MRSA outbreak in New Zealand.
- To detail the management and control strategies implemented during the outbreak.
Main Methods:
- Epidemiological investigation of MRSA cases.
- Tracking of patient and staff movements across hospital wards and facilities.
- Microbiological analysis to confirm strain identity.
Main Results:
- 30 patients and four staff members were infected or colonized with a single MRSA strain over 17 months.
- The outbreak spread from an intensive care unit to 14 hospital wards and five other hospitals.
- MRSA bloodstream infections (septicaemia) led to two patient deaths.
Conclusions:
- The outbreak demonstrated the potential for rapid and widespread dissemination of MRSA within healthcare settings.
- Effective investigation and management are crucial for controlling hospital-acquired infections.
- The potential introduction by an asymptomatic carrier underscores the importance of carrier screening.