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Case-control study on Puumala virus infection: smoking is a risk factor
K Vapalahti1, A-M Virtala, A Vaheri
1Department of Virology, Haartman Institute (Haartmaninkatu 3), University of Helsinki, FIN-00014Helsinki, Finland. olli.vapalahti@helsinki.fi
Epidemiology and Infection
|September 29, 2009
Summary
Puumala hantavirus (PUUV) spreads through rodent-contaminated dust. Key risks include smoking and homes with rodent entry points, suggesting indoor inhalation is a primary transmission route.
Area of Science:
- Infectious Diseases
- Epidemiology
- Public Health
Background:
- Puumala hantavirus (PUUV) transmission routes and risk factors remain unclear.
- Rodent-borne hantaviruses pose a significant public health concern.
- Understanding transmission dynamics is crucial for prevention strategies.
Purpose of the Study:
- To identify and quantify risk factors for Puumala hantavirus infection.
- To investigate the role of environmental and behavioral factors in PUUV transmission.
- To elucidate the primary mode of hantavirus transmission in humans.
Main Methods:
- An epidemiological case-control study was conducted during a PUUV epidemic peak in Finland.
- Data were collected from 282 acute clinical PUUV infections and 204 controls.
- Statistical analysis identified risk factors adjusted for age, sex, and living environment.
Main Results:
- Cigarette smoking was a significant risk factor (OR 3.6).
- Buildings with rodent entry points increased risk (OR 3.3).
- Rodent trap use and firewood handling were also associated with increased risk.
Conclusions:
- Inhalation of aerosolized virus indoors is likely the main transmission route for PUUV.
- The condition of the respiratory tract, potentially worsened by smoking, influences susceptibility.
- Public health interventions should address indoor environments and smoking cessation.
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