As scientists strive to expand an effective COVID-19 vaccine, doctors across the country keep a close eye on it.
Dr. Bali Pulfinishran, professor of microbiology and immunology at Stanford University, says the procedure for creating a vaccine has many steps and that scientists are coming to an end; however, it is difficult to put an end date to the third and final. phase of a vaccine trial. This last phase determines whether the vaccine works.
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It will be one of the largest coronavirus vaccine studies in the world to date, tested on 60,000 volunteers in the United States, South Africa, Argentina, Brazil, Chile, Colombia, Mexico and Peru.
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