There are ominous new signs that the U.S. is on the verge of another strong wave of the coronavirus. On Friday, more than 57,000 new cases were reported, adding to the more than 7.6 million known infections across the country.…
White House coronavirus task force adviser Deborah Birx on Thursday said that public health officials are closely monitoring test subjects during experimental COVID-19 vaccine trials to determine for how long the immune response to a successful vaccine actually lasts.