The flu shot lasts for about 6 months: Here’s when it starts working and why it may get less effective as time goes on – Business Insider Australia

• The flu shot lasts for about six months after you receive it.
• However, it takes about two weeks for it to become effective after you’ve gotten it because your body is building up an immune response.
• Also, according to recent research, the flu shot decreases in efficacy by about 16% every 28 days, so it may get less effective as time goes on.
• This article was medically reviewed by Jason R. McKnight, MD, MS, a family medicine physician and clinical assistant professor at Texas A&M College of Medicine….

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