Why You Need the Flu Shot Every Year – The New York Times

“This is because the virus changes, usually rendering the previous year’s vaccine partly or totally useless. And it’s no secret that the flu vaccine’s effectiveness falls well short of what scientists and public health officials would like to see. Yes, it reduces the severity of influenza infections and prevents thousands of deaths and hospitalizations every year, but nowhere near other recommended vaccines.

But why does the virus change so much every year? Why does the vaccine’s effectiveness vary so much? Here’s the explainer you’ve been waiting for.”

via Why You Need the Flu Shot Every Year – The New York Times

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About David Lindsay Jr

David Lindsay is the author of "The Tay Son Rebellion, Historical Fiction of Eighteenth- Century Vietnam," that covers a bloody civil war from 1770 to 1802. It was published by Footmad and Cherry Blossom Press on September 11, 2017. Find more about it at TheTaySonRebellion.com, also known as, DavidLindsayJr.com.
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