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Why do you have to get a new flu shot every year?

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Different strains of the flu virus mutate over time and replace the older strains of the virus. This is why it's important to get a flu shot each year to ensure that your body develops immunity to the most recent strains of the virus.

SOURCES:

CDC: "Estimating Seasonal Influenza-Associated Deaths in the United States: CDC Study Confirms Variability of Flu."
National Institute of Allergy and Infectious Diseases: "Flu (Influenza): What Are Seasonal Flu, Avian (Bird) Flu and Pandemic Flu?"
American Lung Association: "Cold and Flu Guidelines: Influenza."
FDA/CFAN: "What consumers need to know about avian influenza."
American Academy of Family Physicians: "Bird Flu (Avian Flu)."
GlaxoSmithKline.
News release, FDA.
 

 

Reviewed by Carol DerSarkissian on August 7, 2019

SOURCES:

CDC: "Estimating Seasonal Influenza-Associated Deaths in the United States: CDC Study Confirms Variability of Flu."
National Institute of Allergy and Infectious Diseases: "Flu (Influenza): What Are Seasonal Flu, Avian (Bird) Flu and Pandemic Flu?"
American Lung Association: "Cold and Flu Guidelines: Influenza."
FDA/CFAN: "What consumers need to know about avian influenza."
American Academy of Family Physicians: "Bird Flu (Avian Flu)."
GlaxoSmithKline.
News release, FDA.
 

 

Reviewed by Carol DerSarkissian on August 7, 2019

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How many viruses does the flu shot protect against?

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