Is the flu shot from one year to the next always different or sometimes the same strains as the previous year? If it contains the same strains as the previous year then would a person still need to get the flu shot again if they got the shot the previous year with the same strains?
lookup2 t1_iwseulk wrote
Reply to AskScience AMA Series: We're Experts on Influenza (aka the Flu). AUA! by AskScienceModerator
Is the flu shot from one year to the next always different or sometimes the same strains as the previous year? If it contains the same strains as the previous year then would a person still need to get the flu shot again if they got the shot the previous year with the same strains?