hug and kiss through a plastic film screen to avoid contracting the coronavirus at a nursing home in Barcelona, Spain, on ...

As infections spread across continents, humanity raced to better understand the novel coronavirus and prevent its proliferation, with case counts, hospitalizations and deaths climbing rapidly.

(AP Photo/Jae C. Hong) Commuters wearing face masks to protect against the spread of the coronavirus walk on a street in Tokyo, on Nov. 17, 2020. (AP Photo/Koji Sasahara) People using face masks ...