While scientists work to come up with a safe and effective COVID-19 vaccine, doctors across the country are watching closely.
Dr. Bali Pulendran, a microbiology and immunology professor at Stanford University, says the process of developing a vaccine involves numerous steps, and scientists are getting closer to the end. Still, it's hard to put an end date on the third and final phase of a vaccine trial. This last phase determines whether the vaccine actually works.
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Just announced Wednesday morning, Johnson & Johnson is beginning a huge final-stage study to try to prove if a single-dose COVID-19 vaccine can protect against the virus.
It will be one of the world’s largest coronavirus vaccine studies so far, testing in 60,000 volunteers in the U.S., South Africa, Argentina, Brazil, Chile, Colombia, Mexico and Peru.