Related Experiment Videos
Summary
Hyperchlorination of hospital water supplies effectively controlled a three-year Legionnaires disease outbreak. This demonstrates that potable water can be a source of Legionnaires disease and continuous hyperchlorination is a viable control method.
Area of Science:
- Infectious Diseases
- Environmental Health
- Hospital Epidemiology
Background:
- Legionnaires disease is a severe pneumonia caused by Legionella bacteria.
- Hospital water systems are recognized reservoirs for Legionella species.
- Previous outbreaks have been linked to contaminated water sources.
Purpose of the Study:
- To investigate the source of a three-year Legionnaires disease epidemic in a hospital.
- To evaluate the effectiveness of potable water hyperchlorination as a control measure.
- To establish the role of the hospital water supply in disease transmission.
Main Methods:
- Epidemiological investigation of patient cases and their timelines.
- Microbiological sampling and analysis of the hospital's potable water system.
- Correlation of water system manipulations with disease incidence.
- Monitoring of Legionella pneumophila concentrations before and after hyperchlorination.
Main Results:
- A three-year epidemic of Legionnaires disease was significantly reduced after implementing hyperchlorination.
- Legionella pneumophila was isolated from the hospital's potable water supply, confirming it as the source.
- Disease incidence correlated with specific hospital water system changes.
- A 30-fold increase in organism concentration was observed following water system manipulation.
Conclusions:
- Potable water serves as a significant source for hospital-acquired Legionnaires disease outbreaks.
- Continuous hyperchlorination of potable water is an effective strategy for controlling Legionnaires disease epidemics.
- Water system management and disinfection are critical for preventing hospital-associated infections.