Welcome to the State of California 

Influenza (Flu)

Influenza is a contagious respiratory illness caused by influenza viruses. It can cause mild to severe illness, and at times can lead to death. The best way to prevent influenza is by getting a flu vaccination each fall.

The following groups of people should get a flu vaccine each fall:

  • Adults 50 and older

  • Children aged 6 months up to their 19th birthday.

  • Pregnant women

  • Nursing home residents

  • Health care workers

  • Individuals with a chronic health condition

  • People who live with or care for an adult over 50, a child under 5, or anyone with a chronic health condition

Facts
For Health Professionals
Flu Shots
Vaccine
Data and Surveillance