The real-world findings suggest the shot could seriously reduce asymptomatic transmission.
It's also introducing a strike system that can lead to permanent account suspension.
He says Americans should be hopeful but not complacent.
But older Americans are most likely to die.
Viruses mutate and evolve and the coronavirus is no different.
A new study suggests the universe is 13.77 billion years old, and a cosmic controversy grows.
There's no evidence yet that vaccines "prevent people from actually getting the infection," official warns.
Adults over 75 are eight times more likely to be hospitalized after contracting the virus.
Italy and Austria are the latest countries to restrict flights from the U.K.
The pandemic has shipping companies performing a high-stakes juggling act.