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History Of Vaccines

A volunteer is injected with either an experimental COVID-19 vaccine or a comparison shot as part of the first human trials in the U.K. to test a potential vaccine.
University of Oxford via AP
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A volunteer is injected with either an experimental COVID-19 vaccine or a comparison shot as part of the first human trials in the U.K. to test a potential vaccine.

Two pharmaceutical companies, Pfizer and Moderna, have developed coronavirus vaccines that are close to 95 percent effective.

The speedy turnaround in trial results, less than a year after researchers began their work, is record-setting.

We explore the evolution of vaccines as the deadly coronavirus pandemic challenges doctors and scientists racing for a remedy.

Guests: