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Vaccines

Doctor Decoded: What Are “Live Virus” Vaccines?

Lauren Smith, MAKaren Hovav, MD, FAAP
Written by Lauren Smith, MA | Reviewed by Karen Hovav, MD, FAAP
Updated on September 10, 2025
Reviewed by Karen Hovav, MD, FAAP | September 10, 2025

With more and more people curious about the vaccine development process, one type of vaccine has received a great deal of attention. Live virus vaccines, or “attenuated” vaccines, use a weakened form of the actual virus. Naturally, this sounds spooky, but the science behind it may put your mind at ease.

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Lauren Smith, MA
Written by:
Lauren Smith, MA
Lauren Smith, MA, has worked in health journalism since 2017. Before joining GoodRx, she was the senior health editor and writer for HealthiNation.
Karen Hovav, MD, FAAP, has more than 15 years of experience as an attending pediatrician. She has worked in a large academic center in an urban city, a small community hospital, a private practice, and an urgent care clinic.

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