W3Schools

Why the flu vaccine could be getting better

The flu vaccine of the future could do a better job of keeping you healthy.

In any given year, the flu shot is only somewhat accurate when it comes to protecting against the various strains of the illness. Last year, the vaccine was nearly 60% effective at preventing the flu overall, but was only 51% effective against the H1N1 strains responsible for most flu illnesses that season, according to the Centers for Disease Control and Prevention. In 2014, almost half of the most prominent strains were not included in the vaccine.

Part of why the vaccine isn’t more effective is because there are many strains of influenza, and experts must predict which strains of the influenza virus will be most active when developing that year’s batch of vaccines ahead of flu season.

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