Before and After Facts About Vaccines

First published at 17:44 UTC on May 22nd, 2020.

Vaccine History: Developments by Year: https://www.chop.edu/centers-programs/vaccine-education-center/vaccine-history/developments-by-year
Surveillance for Asthma United States, 1960–1995: https://www.cdc.gov/mmwr/PDF/ss/ss4701.pdf
Epidemiology of A…

MORE
CategoryNone
SensitivityNormal - Content that is suitable for ages 16 and over
DISCUSS THIS VIDEO