At least 120,000 Americans are needed to test COVID-19 vaccines. A 'very encouraging' 107,000 are so far signed up.

At a time when some Americans are concerned about the safety of a COVID-19 vaccine, tens of thousands have already volunteered to help bring oneinto existence.

As of last week, more than 107,000 people had signed up to take part in testing.

“That’s why we’re optimistic that we’re going to be able to get the trials enrolled in an expeditious way. I think we can do what we need to do,” said Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases.

The milestone was reached just...