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Influenza A(H3N2) Variant Virus Outbreak at Three Fairs - Maryland, 2017
MMWR. Morbidity and Mortality Weekly Report
|October 26, 2018
Summary
Variant influenza A(H3N2) virus spread among children and adults at Maryland agricultural fairs in 2017. Public health officials recommend high-risk individuals avoid swine contact to prevent future outbreaks.
Area of Science:
- Veterinary Medicine
- Public Health
- Infectious Diseases
Background:
- Agricultural fairs can serve as venues for zoonotic disease transmission.
- Influenza A(H3N2) virus is known to circulate in swine populations.
Purpose of the Study:
- To investigate an outbreak of influenza A(H3N2) variant virus at Maryland agricultural fairs.
- To identify risk factors associated with human infection.
Main Methods:
- Case finding and laboratory testing for influenza A(H3N2)v in humans and swine.
- Epidemiological investigation of patient exposures at agricultural fairs.
Main Results:
- Forty human cases of influenza A(H3N2)v infection were identified in individuals with swine exposure.
- Children under 5 years old were disproportionately affected, with 60% of high-risk individuals being in this age group.
- Both direct and indirect contact with swine were associated with infection.
Conclusions:
- Agricultural fairs pose a risk for variant influenza virus transmission from swine to humans, especially children.
- Public health messaging recommending avoidance of swine for high-risk groups is crucial for prevention.
- Enhanced surveillance and control measures are needed at animal-human interfaces like agricultural fairs.
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