Wind in November, Q fever in December

Area of Science:

• Zoonotic disease epidemiology
• Environmental factors in infectious disease transmission
• Bacterial pathogenesis and transmission

Background:

• Q fever is a global zoonosis caused by Coxiella burnetii.
• Transmission occurs from animal reservoirs to humans via inhalation of infectious aerosols.
• Understanding epidemiological drivers is crucial for public health interventions.

Purpose of the Study:

• To investigate the epidemiology of Q fever in the Bouches-du-Rhone district, France.
• To assess the specific roles of wind and rainfall in Coxiella burnetii transmission.
• To correlate disease incidence with environmental factors and livestock activities.

Main Methods:

• Retrospective epidemiological analysis of Q fever cases during 1998-1999.
• Correlation of case incidence with meteorological data, specifically wind frequency (Mistral).
• Analysis of disease onset timing relative to the local lambing season.

Main Results:

• An unexpected increase in Q fever cases was observed during the winter of 1998-1999.
• Higher Q fever incidence was statistically associated with increased Mistral wind frequency.
• The increased wind frequency occurred approximately one month prior to disease onset, coinciding with the post-lambing season.

Conclusions:

• Wind, particularly the Mistral, plays a significant role in Coxiella burnetii transmission in this region.
• Environmental factors like wind are important, albeit difficult-to-prevent, drivers of Q fever outbreaks.
• Further research is necessary to identify and confirm preventable individual behavioral risk factors for Q fever.