What Causes the Flu?
The flu virus changes from year to year. Vaccines provide protection against the most common strains of the flu each year. The flu vaccine works by stimulating the immune system to create antibodies to fight the infection.
To create an effective vaccine, the World Health OrganizationTrusted Source determines which strains of the flu virus to include in the next year’s vaccine. The vaccine contains either an inactive or weakened form of the flu virus.
Original Article Source Credits: Healthline , https://www.healthline.com/
Article Written By: Valencia Higuera
Original Article Posted on: September 8, 2020
Link to Original Article: https://www.healthline.com/health/flu-causes
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