Flu Vaccine Changes Each Year

Written by Clinical Research Associates Staff


Every year, the flu vaccine changes to reflect the virus strains most likely to cause the flu that season. The decision is made by experts from institutions like the

  • World Health Organization (WHO)
  • Federal Drug Administration (FDA)
  • U.S. Centers for Disease Control and Prevention (CDC)

These organizations study virus patterns and samples around the world. This helps them predict the strains that will be circulating in the upcoming flu season.