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Three Vaccines Use Nonlethal Viruses to Protect Against the More Deadly COVID-19

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Three Vaccines Use Nonlethal Viruses to Protect Against the More Deadly COVID-19
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More than 5 million people worldwide have had their lives cut short by COVID-19, and the number keeps rising. The best defense against this virus is a vaccine. VOA's Carol Pearson explains one approach in making a vaccine that's been effective against polio, measles, Ebola and a host of other viruses.

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