The United States cannot count on the availability of a safe and effective Covid-19 vaccine, the government's top infectious diseases expert said on Tuesday, and he urged Americans to work together to fight the virus that is surging across large parts of the country.source https://timesofindia.indiatimes.com/world/us/no-guarantee-us-will-have-safe-effective-covid-19-vaccine-fauci-says/articleshow/76716334.cms
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