A version of this story appeared in the July 21 edition of CNN's Coronavirus: Fact vs. Fiction newsletter. Vaccine development normally takes years, but that timetable is being dramatically compressed to meet the urgent need, as the coronavirus death toll climbs. It's currently impossible to know from an antibody test whether someone is immune to the coronavirus, according to Dr. Celine Gounder, an epidemiologist at New York University . More Americans are testing positive for coronavirus all over the US at record-breaking numbers and the surge is slowing down testing. Masks, experts have said, are one of the most powerful tools to prevent further infections.

Source: CNN July 21, 2020 11:37 UTC