The Food and Drug Administration’s chief tobacco regulator has been forced out.

The top vaccine official with the Food and Drug Administration has resigned and criticized the nation's top health official for allowing “misinformation and lies” to guide his thinking behind the safety of vaccinations.

Updated COVID-19 vaccines are on their way.

Government advisers say it’s time to update the recipe for the COVID-19 vaccines Americans will receive in the fall.

The Food and Drug Administration meets this week to consider a much-debated treatment for Lou Gehrig’s disease.

U.S. regulators have approved updated COVID-19 vaccines from Pfizer and Moderna, shots aimed at revving up protection this fall and winter.

New blood donations rules will allow sexually active gay and bisexual men in monogamous relationships to give in the U.S. The Food and Drug Administration guidelines ease decades-old restrictions on blood donations put in place to protect the blood supply from HIV.

Pfizer says its updated COVID-19 booster significantly revved up adults' virus-fighting antibodies.

Pfizer is asking the Food and Drug Administration to expand use of its updated COVID-19 booster shot to children ages 5 to 11.

U.S. health authorities are facing a critical decision: whether to offer new COVID-19 booster shots this fall that are modified to better match the latest changes of the shape-shifting coronavirus.

COVID-19 shots for infants, toddlers and preschoolers in the U.S. have moved a step closer.

Parents hoping to get their youngest children vaccinated against COVID-19 have some encouraging news.

U.S. regulators have authorized a COVID-19 vaccine booster for healthy children ages 5 to 11.

Moderna is asking U.S. regulators to open its COVID-19 vaccine to the nation's youngest children.

Americans age 50 and older can get a second COVID-19 booster if it’s been at least four months since their last vaccination.

U.S. regulators are shortening the time that people who received Moderna's COVID-19 vaccine have to wait for a booster — to five months rather than six.

The U.S. is expanding COVID-19 boosters as it confronts the omicron surge.

The U.S. booster campaign is getting a lot simpler now that regulators have opened extra vaccine shots to all adults.

The U.S. is opening COVID-19 vaccine boosters to all adults, and urging them for anyone 50 and older.

U.S. regulators are extending COVID-19 boosters to Americans who got the Moderna or Johnson & Johnson vaccine.

It could take U.S. regulators a few weeks to decide whether to clear COVID-19 vaccines for children ages 5 to 11.

Pfizer has submitted research to the U.S. Food and Drug Administration on the effectiveness of its COVID-19 vaccine in children but the shots may not be available until November.

Pfizer has submitted research to the U.S. Food and Drug Administration on the effectiveness of its COVID-19 vaccine in children as it moves closer to seeking approval for expanded use of the shots.

Pfizer says its COVID-19 vaccine works for children ages 5 to 11.

The Food and Drug Administration’s vaccine chief is pledging to rapidly evaluate COVID-19 vaccines for younger kids — as soon as the studies are in.

Temporary side effects after COVID-19 vaccines are normal and a sign your immune system is revving up.

Federal health officials including Dr. Anthony Fauci, the United States’ top infectious disease expert, are expected to give U.S. Senators an update on the efforts to combat COVID-19 in a hearing on Tuesday morning.

Johnson & Johnson’s COVID-19 vaccine will remain in limbo for a while longer.

Health authorities are investigating highly unusual blood clots after use of two COVID-19 vaccines, and a rare immune response is the main suspect.

The U.S. recommendation to “pause” use of the single-dose Johnson & Johnson COVID-19 vaccine set off a chain reaction worldwide and dealt a setback to the global vaccine campaign.

A medical worker prepares a shot of Russia's Sputnik V coronavirus vaccine in a local rural medical post in the village of Ikhala in Russias Karelia region, Tuesday, Feb. 16, 2021. (AP Photo/Dmitri Lovetsky)MEXICO CITY — Mexico has received its first shipment of Russia’s Sputnik V COVID-19 vaccine. Mexico received its first shipment of vaccines from Pfizer in mid-December, but turned to Sputnik V in January when other expected vaccine shipments were delayed. The company reiterated that it will have capacity to provide 100 million vaccine doses to the U.S. by the end of June. ___WASHINGTON — The White House now says it expects to catch up by mid-week on deliveries of coronavirus vaccine doses that were delayed by severe weather.

This July 2020 photo provided by Johnson & Johnson shows a vial of the Janssen COVID-19 vaccine. On Thursday, Feb. 4, 2021, Johnson & Johnson has asked U.S. regulators to clear the worlds first single-dose COVID-19 vaccine, an easier-to-use option that could boost scarce supplies. (Johnson & Johnson via AP)Johnson & Johnson asked U.S. regulators Thursday to clear the world’s first single-dose COVID-19 vaccine, an easier-to-use option that could boost scarce supplies. J&J’s vaccine was safe and offered strong protection against moderate to severe COVID-19, according to preliminary results from a massive international study. J&J also is studying a two-dose version of its vaccine, but results won’t be available for several more months.

In the new guidelines posted on its website, the FDA said vaccine makers should follow trial participants for at least two months to rule out any major side effects before seeking emergency approval. That standard had been a sticking point between the FDA and White House officials, who said it could unreasonably delay the availability of COVID-19 vaccines. On Monday Trump said vaccines are coming “momentarily,” in a video recorded after he returned to the White House. The White House attempt to block the guidance followed a string of instances in which the Trump administration has undercut its own medical experts working to combat the pandemic. Beyond exposing the rift between the White House and FDA, the delay in releasing the guidelines may have had limited practical effect.

The director of the National Institutes of Health has already said there needs to be 30,000 participants in the Phase 3 clinical trials. "Each vaccine needs to be tested on about 30,000 volunteers," Dr. Francis Collins told CNN. Some vaccine experts worry that even if a company intends to enroll those numbers, the Trump administration will prematurely approve their vaccines before their trials are over. Phase 3 trials vary in sizePhase 3 trials can vary in size. CNN reached out to all six companies asking what size they planned for their Phase 3 trials.