A mere six months after identifying the SARS-CoV-2 virus as the cause of Covid-19, scientists are on the precipice of a having a vaccine to fight it. Moderna and the National Institutes of Health recently announced the start of a Phase 3 clinical trial, joining several others in a constructive rivalry that could save millions of lives.
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Opinion: A COVID-19 vaccine, amazingly, is close. Why am I so worried?