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Three nursing home outbreaks of Norwalk-like virus in Brisbane in 1999
1Specialised Health Services, Brisbane, Queensland. Justine_Ward@health.qld.gov.au
Abstract:
We report on three nursing home outbreaks of gastroenteritis in Brisbane in 1999. The presence of Norwalk-like virus (NLV) genogroup 2 was demonstrated by reverse transcription polymerase chain reaction (RT-PCR) in all three outbreaks. Common findings of these investigations were rapid spread of the illness within the institutions and difficulties in identifying a common source. Nursing home populations are vulnerable and it is important for each institution to have infection control policies in place so outbreaks can be managed promptly. This includes the exclusion of ill staff for 48 to 72 hours after recovery from illness. Genogrouping of NLV by RT-PCR can take several days so control measures will generally have to be instituted before results become available.
Insights
Norwalk-like virus (NLV) caused three nursing home outbreaks in Brisbane. Rapid spread and difficulty finding a source highlight the need for strict infection control and staff exclusion policies.
Area of Science:
- Epidemiology
- Infectious Diseases
- Public Health
Background:
- Gastroenteritis outbreaks in nursing homes pose significant public health challenges.
- Vulnerable elderly populations are at high risk during infectious disease outbreaks.
- Prompt identification and control are crucial to mitigate spread in institutional settings.
Purpose of the Study:
- To investigate three nursing home outbreaks of gastroenteritis in Brisbane.
- To identify the causative agent and understand transmission dynamics.
- To inform infection control strategies in long-term care facilities.
Main Methods:
- Case investigations were conducted during three separate outbreaks.
- Reverse transcription polymerase chain reaction (RT-PCR) was used for viral detection and genogrouping.
- Epidemiological data on illness spread and potential sources were collected.
Main Results:
- Norwalk-like virus (NLV) genogroup 2 was confirmed as the causative agent in all three outbreaks.
- Rapid intra-institutional spread of gastroenteritis was observed.
- Common sources for the outbreaks were difficult to pinpoint.
Conclusions:
- NLV genogroup 2 is a significant cause of gastroenteritis outbreaks in nursing homes.
- Effective infection control policies, including staff exclusion, are vital for managing outbreaks.
- Anticipatory control measures are necessary due to the time delay in laboratory confirmation.