The Centers for Disease Control and Prevention on Thursday endorsed booster shots for millions of older or otherwise vulnerable Americans, opening a major new phase in the U.S vaccination drive against COVID-19.

The U.S. moved a step closer Wednesday to offering booster doses of Pfizer’s COVID-19 vaccine to senior citizens and others at high risk from the virus as the Food and Drug Administration signed off on the targeted use of extra shots.

Influential government advisers will debate Friday if there’s enough proof that a booster dose of Pfizer’s COVID-19 vaccine is safe and effective — the first step toward deciding which Americans need one and when.

The average person doesn’t need a COVID-19 booster yet, an international group of scientists — including two top U.S. regulators — wrote Monday in a scientific journal.

President Joe Biden says people who have been waiting for the FDA to formally approve a COVID-19 vaccine should get their shot now to stem what he calls a “pandemic of the unvaccinated.” Dr. Michael Angarone of Northwestern Medicine weighs in on that and more.

The U.S. gave full approval to Pfizer’s COVID-19 vaccine Monday, a milestone that could boost public confidence in the shots and spur more companies, universities and local governments to make vaccinations mandatory.

U.S. regulators on Monday added a new warning to Johnson & Johnson’s COVID-19 vaccine about links to a rare and potentially dangerous neurological reaction, but said it’s not entirely clear the shot caused the problem.

The acting head of the Food and Drug Administration on Friday called for a government investigation into highly unusual contacts between some of her agency’s drug reviewers and the maker of a controversial new Alzheimer’s drug.

As long-haulers grapple with lingering symptoms of COVID-19, some are turning to an antiparasitic for relief. We speak with local patients and experts about the use of ivermectin for treating COVID-19.

Dozens of different at-home COVID-19 tests are now available from big-box retailers and pharmacies. But before you run out and buy one, a few words of caution from Dr. Emily Landon, an infectious disease specialist at UChicago Medicine.

The Food and Drug Administration said it granted approval to the drug from Biogen based on results that seemed “reasonably likely” to benefit Alzheimer’s patients. It’s the only drug that U.S. regulators have said can likely treat the underlying disease, rather than manage symptoms like anxiety and insomnia.

Spicy popcorn cicadas, anyone? Not so fast, the Food and Drug Administration warns, if you have a shellfish allergy. The insects are related to shrimp and lobster. 

Moderna said Tuesday its COVID-19 vaccine strongly protects kids as young as 12, a step that could put the shot on track to become the second option for that age group in the U.S.

Tobacco companies have long marketed menthol cigarettes to Black Americans. The CEO of the NAACP calls a potential ban of such products “long overdue,” but some people are concerned it could lead to further criminalization of communities of color.

The U.S. Food and Drug Administration is expected to authorize Pfizer’s COVID-19 vaccine for youngsters ages 12 to 15 by next week, according to a federal official and a person familiar with the process, setting up shots for many before the beginning of the next school year.

The U.S. on Tuesday recommended a “pause” in use of the single-dose Johnson & Johnson COVID-19 vaccine to investigate reports of rare but potentially dangerous blood clots, setting off a chain reaction worldwide and dealing a setback to the global vaccination campaign.