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Vaccine - Wikipedia
Vaccines and immunization: What is vaccination?
Vaccine | Definition, Types, History, & Facts | Britannica
Vaccines and immunization - World Health Organization (WHO)
COVID-19 vaccines - World Health Organization (WHO)
What is a vaccine, and how do vaccines work?
What you need to know about COVID-19 vaccines | UNICEF
Vaccine | Journal | ScienceDirect.com by Elsevier
Vaccines for COVID-19 | CDC
Get the facts about COVID-19 vaccines - Mayo Clinic