US NIH director Francis Collins, CDC director Robert Redfield testify at Senate subcommittee hearing to review Operation Warp Speed, the researching, manufacturing, and distributing of a safe and effective coronavirus vaccine.
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In This Story: Vaccine
A vaccine is a biological preparation that provides active acquired immunity to a particular infectious disease. A vaccine typically contains an agent that resembles a disease-causing microorganism and is often made from weakened or killed forms of the microbe, its toxins, or one of its surface proteins.