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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 the weekend, Vermont crested 9,000 total cases of COVID-19 since March. And high numbers continue, with 167 cases reported on Tuesday. Our weekly�

The rollout of coronavirus vaccines around the country continues to go slower than expected, but a third vaccine may soon be on the way. An inoculation�

With case and death counts still surging, the pressure is on to vaccinate as many people as possible. Here's what it will take to get more Americans their shots, fast.

The crisis starts around 2 a.m. at a hospital in Mendocino County, Calif. A compressor gives out, giving the staff two hours to use the coronavirus vaccines before they are declared unusable.

By the end of January, Vermonters in group 1A should have gotten at least the first dose of the COVID-19 vaccine. But there have been problems with�

Agency officials said reducing the number of doses creates a potential for harm in patients because "they may assume that they are fully protected when they are not" and may "take unnecessary risks."

Saturday's total of 299,087 new cases marks a new single-day high for the U.S. Meanwhile, vaccination campaigns are off to a disorganized start.

Distribution of a COVID-19 vaccine is underway in Vermont. Hospitals have received their first doses and pharmacies are scheduled to begin clinics at�

The U.S. conducts nearly 2 million coronavirus tests daily. A new analysis shows millions more are needed to protect the most vulnerable. Use our tool to see how your state is doing.