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Why Doesn’t the Flu Vaccine Always Work?

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 Biology   |   Health   |   Science
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Description

The flu vaccine changes from year to year and its efficacy varies. Here’s why.

NOVA on Facebook: https://www.facebook.com/NOVAonline
NOVA on Twitter: @novapbs
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PRODUCTION CREDITS

Writing & Research
Theresa Machemer

Digital Producer: Ari Daniel

Editorial Review: Julia Cort

Special Thanks: Centers for Disease Control and Prevention

© WGBH Educational Foundation 2018

MEDIA CREDITS

Visuals & Videography:
Seth Zost
David W. Held
Centers for Disease Control and Prevention
GSK
Seqirus
Flickr/ CC BY-NC 2.0 | Carlos Villarreal
pexels.com
pixabay.com
shutterstock.com
wikipedia | Thorkild Tylleskar, Timisstuck, WHO

Music: ­APM

Sound Effects: ­freesound.org

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