This has been downvoted, but it's absolutely true - see the table here: https://en.wikipedia.org/wiki/Influenza_vaccine#Effectiveness https://en.wikipedia.org/

This has been downvoted, but it's absolutely true - see the table here: https://en.wikipedia.org/wiki/Influenza_vaccine#Effectiveness https://en.wikipedia.org/wiki/Influenza_vaccine#Effectivenes... The best effectiveness of a flu vaccine in the US since 2004 was 60%.