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Exposure to Legionella in geriatric institutions
Israel Journal of Medical Sciences
|October 1, 1986
Summary
Legionella bacteria were found in two hospitals, with high seropositivity rates indicating exposure in one facility. However, no direct link was found between Legionella exposure and patient illness.
Area of Science:
- Environmental microbiology
- Infectious diseases
- Geriatric medicine
Background:
- Legionella species are known causes of pneumonia (legionellosis).
- Geriatric populations may be at higher risk for healthcare-associated infections.
- Understanding Legionella prevalence in healthcare settings is crucial for infection control.
Purpose of the Study:
- To investigate the prevalence of seroreactivity to Legionella species in geriatric facilities.
- To identify potential sources of Legionella in hospital water systems.
- To assess seroconversion rates to Legionella antigens in new patients.
Main Methods:
- Serological testing for antibodies against six Legionella species in patients and staff.
- Isolation and identification of Legionella from water samples using culture and immunofluorescence.
- Longitudinal monitoring of new patients for seroconversion over a two-year period.
Main Results:
- High seropositivity rates (up to 35.7%) were observed in hospital patients and staff, particularly in one facility.
- Legionella pneumophila strains were isolated from hospital water sources.
- 24% of followed-up patients showed significant seroconversion to Legionella antigens.
Conclusions:
- Legionella bacteria were present in the studied geriatric hospitals, indicating potential exposure.
- High seropositivity suggests significant intramural exposure to Legionella at one hospital.
- Despite evidence of exposure, a direct link to patient illness could not be established in this study.