Newshour - Covid research: Half of people exposed to virus fail to get infected - ÃÛÑ¿´«Ã½ Sounds

Newshour - Covid research: Half of people exposed to virus fail to get infected - ÃÛÑ¿´«Ã½ Sounds
Covid research: Half of people exposed to virus fail to get infected
A 'human challenge' study reveals more about how the body responds to virus exposure