Why Doesn’t the Flu Vaccine Always Work?

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

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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