Defining Pontiac Fever for Epidemiological Studies
Author Information
Author(s): Tossa Paul, Deloge-Abarkan Magali, Zmirou-Navier Denis, Hartemann Philippe, Mathieu Laurence
Primary Institution: Département Environnement et Santé Publique and INSERM ERI 11, Henri Poincaré University
Hypothesis
Can an operational definition of Pontiac fever be established for non-epidemic settings?
Conclusion
The proposed definition of Pontiac fever may aid in epidemiological surveillance and highlight sources of Legionella.
Supporting Evidence
- 23 cases of Pontiac fever were identified during the study.
- Legionella concentrations of 10^4 cells/L in water were linked to increased incidence of Pontiac fever.
- The average duration of Pontiac fever episodes was 4 days.
Takeaway
Pontiac fever is a mild illness caused by Legionella, and this study created a definition to help identify it in older adults living in nursing homes.
Methodology
The study followed 560 elderly subjects in nursing homes for 4 months, assessing symptoms and shower water contamination levels.
Potential Biases
Potential Berkson type error due to group exposure assessment.
Limitations
Exposure assessment was semi-ecological, not individual, which may lead to misclassification.
Participant Demographics
560 elderly volunteers, median age 81, predominantly female (71.9%), with various medical histories.
Statistical Information
P-Value
0.04
Confidence Interval
95% CI: 0.122–0.127
Statistical Significance
p = 0.04
Digital Object Identifier (DOI)
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