What you need to know about how long your annual flu shot will last – Oklahoman.com

Adam Cohen and Dr. Rod McEver| Special to The Oklahoman

I know health officials sometimes caution people not to get the influenza vaccine too early so that protection doesnt wear off before flu season ends. How long does immunity from a flu shot last? Would a booster after the first shot help?

For this question, I consulted Judith James, M.D., Ph.D., who has studied the influenza vaccine at the Oklahoma Medical Research Foundation. Dr. James is an immunologist, board-certified rheumatologist, and OMRFs vice president of clinical affairs. Heres what she said:

Flu activity in the U.S. usually increases in early fall and peaks from December to February. Those who get a flu vaccine before November should have adequate protection against severe disease and death through spring. Although two doses may sound better than one, flu boosters are currently only recommended for young children.

How long a flu shot lasts depends on individual immune systems, but the vaccine is usually effective for 6-8 months. Immunity wanes toward the end of our flu season. All viruses mutate, but influenza viruses do so rapidly. This perpetual viral drift necessitates the annual flu vaccine.

Studies of second doses of flu vaccine in one season have shown no benefit for most adults. But among the very young, its a different story.

For children ages 6 months to 8 years getting their first flu shot, the Centers for Disease Control and Prevention recommends two doses spaced at least four weeks apart. For a young immune system that hasnt seen the flu before, this booster dose of vaccine is important to the bodys ability to mount a protective response when it encounters the virus.

This double dose of protection for kids may impact their likelihood of contracting the flu in future seasons. In a 2016 study in the Pediatric Infectious Disease Journal, researchers found young children whod received two doses during a prior season were only half as likely as their peers to contract flu the next year.

McEver, a physician-scientist, is vice president of research at the Oklahoma Medical Research Foundation. Cohen is a marathoner and OMRFs senior vice president and general counsel. Submit your health questions for them to contact@omrf.org

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What you need to know about how long your annual flu shot will last - Oklahoman.com