I did an in-depth study on the safety and effectiveness of vaccines in 2019. Here's the summary video:

https://ipfs.cahlen.org/ipfs/bafybeietjiglcpgkk725mr2uxnfifxhgyl6tgx4abxjol3jmfirctu3254/CahlenLee_20191211_AreVaccinesSafeAndEffective.mp4

In 2018-19 the Flu Vaccine was 29% effective for the strains it targeted, and only 14% effective for people above the age of 50. It was only 9% effective against the most common strain during this period of time.

Here's the full article I wrote with 130 citations:

https://cahlen.org/are-vaccines-safe-and-effective/

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