Thanks for tuning in! Here are the sources from this episode of MedBits:

https://www.reidhealth.org/blog/history-of-vaccines

https://www.healthaffairs.org/doi/10.1377/hlthaff.24.3.611

https://www.pnas.org/doi/10.1073/pnas.1400472111

https://www.immune.org.nz/vaccines/vaccine-development/brief-history-vaccination

https://www.chop.edu/centers-programs/vaccine-education-center/vaccine-history/developments-by-year