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The United States will know by the end of the year or the beginning of 2021 whether a coronavirus vaccine is safe and effective, Dr. Anthony Fauci, the nation's leading infectious diseases doctor, said Monday, according to NBC news.

Multiple vaccine candidates are being studied, and "if things go the way it looks like they're going, one of these will enter phase 3 at the end of July," he said, referring to the final phase of clinical trials needed to determine whether a drug works.

Other vaccine candidates will enter phase 3 trials after July, and "we hope that by end of this year, or the beginning of 2021 we will at least have an answer whether the vaccine or vaccines - plural - are safe and effective," Fauci, who is the director of the National Institute of Allergy and Infectious Diseases, said.
As the source said, he took part in a conversation with Dr. Francis Collins, director of the National Institutes of Health, on Facebook Live on Monday as new cases of COVID-19 continue to surge in the U.S.