For more general information, see our Influenza page.
Influenza is not just a bad cold. It is a contagious respiratory infection caused by various strains of influenza virus. It can cause life-threatening complications. Each year, seasonal influenza causes thousands of deaths and hospitalizations. People with long-term health conditions are especially at risk.
Getting vaccinated protects you, your family and your patients. Annual vaccination is the most important tool to prevent influenza-related deaths.
Sign up to receive regular influenza updates. Go to our eNotifications page and choose Health Advisories and Disease Alerts.
- Influenza page—CDC.
- Rapid influenza diagnostic tests—Can be useful in clinical decision-making but sensitivity is low (50-70%). Might not detect novel or variant influenza. Negative tests do not rule out influenza.
- Prescribing antiviral medication.
- State data—Washington State Department of Health.
- National data—CDC.
- King County data—Public Health–Seattle & King County.
- Virology data—University of Washington.
- Influenza vaccine information.
- Sample standing orders for child and teen influenza immunization.
- Sample standing orders for adult influenza immunization.
- Vaccine Information Statements (available in multiple languages)—Immunization Action Coalition.
- Healthcare worker immunization toolkit.