WASHINGTON (AP) — About 4 million federal workers, from FBI agents to Bureau of Prisons guards to U.S. Food and Drug Administration workers, are to be vaccinated by Nov. 22 under the president’s executive order aimed at stopping the spread of the coronavirus.

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Some employees, like those at the White House, are nearly all vaccinated.

But the rates are lower at other federal agencies, particularly those related to law enforcement and intelligence.

And some resistant workers are digging in, filing lawsuits and protesting what they say is unfair overreach by the White House.

The upcoming deadline is the first test of President Joe Biden's push to compel people to get vaccinated.

Answers to 25 common COVID-19 vaccine questions

Vaccinations for COVID-19 began being administered in the U.S. on Dec. 14, 2020. The quick rollout came a little more than a year after the virus was first identified in November 2019. The impressive speed with which vaccines were developed has also left a lot of people with a lot of questions. The questions range from the practical—how will I get vaccinated?—to the scientific—how do these vaccines even work?

Keep reading to discover answers to 25 common COVID-19 vaccine questions.