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Swine Influenza

Swine Influenza (Flu)

Swine flu is a respiratory disease of pigs caused by type A influenza viruses. These swine flu viruses regularly cause outbreaks of influenza in pigs throughout the year, but most outbreaks happen during the late fall and winter months similar to outbreaks of seasonal influenza in people. Like human influenza viruses, there are different subtypes and strains of swine flu viruses. The main swine flu viruses circulating in U.S. pigs in recent years have been H1N1, H3N2, and H1N2. Swine flu viruses can cause high levels of illness in pigs, but usually cause few deaths.

What's Happening Now

As fair season is starting in Indiana, the Indiana Department of Health is gathering information on any potential human illness associated with attending a local or state fair or animal exhibition during the 2024 summer. If you attended a local or state fair or animal exhibition and developed symptoms, please complete this survey:

Frequently Asked Questions

Information for the Public

Information for Clinicians

Fairs, Farms, and Occupational Workers

Laboratory Specimen Information

State and Federal Partner Swine Resources

Contact Information

For healthcare providers requesting approval for specimen testing at IDOH Laboratory, please call the IDOH Infectious Disease Epidemiology and Prevention Division at 317-233-7125 to obtain approval from the Influenza Coordinator or the Vector-Borne and Zoonotic Disease Epidemiologist during normal business hours (Monday - Friday, 8:15am to 4:45pm).

  • If calling after hours or on holidays, please contact the Epidemiologist On-Call (EOC) at 317-233-1325 for specimen testing approval.

For questions on specimen collection, transport, or shipment, please call the IDOH Laboratory Virology Division at 317-921-5500 during normal business hours (Monday - Friday, 8:15am to 4:45pm).

Page last reviewed/updated: October 2024