During a Senate hearing on safely returning to work and school amid the COVID-19 pandemic on Tuesday, head of the National Institutes of Health (NIH) Dr. Anthony Fauci said there is “no guarantee” for a safe and effective COVID-19 vaccine, but that he is “cautiously optimistic.”

He added that data on vaccine efficacy may be available “sometime in the winter or early part of next year.”

When speaking with Sen. Elizabeth Warren at the hearing, Fauci also stated that the U.S. is “going in the wrong direction” and warned that the daily increase of new cases in the country, currently around 40,000, could reach 100,000 if people do not adhere to social distancing guidelines and wear masks.

"I am very concerned because it could get very bad," he said.

COVID-19 cases more than doubled in June in at least 10 U.S. states, including Texas and Florida, a Reuters tally showed.

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