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Their arrival comes more than a week after an unexpected delay prevented the scientists from entering China.

It takes time after vaccination for immunity to the virus to build up, and no vaccine is 100% effective. Plus, scientists don't yet know if the vaccine stops viral spread. Here's what's known so far.

Over 90% of Californians are still subject to the order, which went into effect in December.

Hebei province, with a population of 11 million people, has reported more than 600 new coronavirus cases, since early January.

Scientists, public health experts and opposition politicians have raised questions about one of the two vaccines the country of 1.4 billion people has authorized for emergency use against COVID-19.

Designated as frontline essential workers, some educators see a path out of "the lion's den."

Dr. Anthony Fauci says the country will likely need a vaccination level of between 70% and 90% to reach herd immunity. Right now, that math doesn't quite add up.

It appears to be 50% more infectious, and researchers predict the new coronavirus variant could start to dominate in the U.S. by March. The time to prepare is now, they say.

Starting Jan. 26, airlines will only allow people to board if they provide documentation that they tested negative in the preceding three days or have recovered from the disease.

The federal government announced several big changes to its vaccine plans, upending earlier guidance about whom to prioritize for the next phase.