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Vaccine Types | HHS.gov
Understanding Six Types of Vaccine Technologies | Pfizer
Recombinant Vaccine - an overview | ScienceDirect Topics
Recombinant vaccine - Latest research and news - Nature
Recombinant Vaccine - an overview | ScienceDirect Topics
Chapter 1: Principles of Vaccination | Pink Book | CDC
Vaccine Glossary | Vaccines & Immunizations | CDC