|

The move would add a fourth dose to the COVID vaccine regimen, which currently consists of a primary series of two shots, followed months later by a booster dose, in an effort to provide maximum protection to the over-65 population that has been hit hardest by the pandemic.

|
A person is injected with her second dose of the Pfizer COVID-19 vaccine at a Dallas County Health and Human Services vaccination site in Dallas, Thursday, Aug. 26, 2021. (AP Photo / LM Otero, File)

Friday, the FDA reversed course and said it had become clear the agency needed to wait for data on how well a third shot works for the youngest age group. Pfizer said in a statement that it expected the data by early April.

|
Pharmacist Sima Manifar prepares a children’s dose of the Pfizer COVID-19 vaccine during a vaccination clinic on Dec. 29, 2021, in Lawrence, Mass. (AP Photo / Charles Krupa)

Pfizer is enrolling healthy adults to test a reformulated COVID-19 vaccine that matches the hugely contagious omicron variant, to see how it compares with the original shots.

|
A doctor loads a dose of Pfizer COVID-19 vaccine into a syringe in a Dec. 2, 2021, file photo at a mobile vaccination clinic in Worcester, Mass. (AP Photo / Steven Senne, File)

The Centers for Disease Control and Prevention's advisers voted that a booster was safe for younger teens and should be offered to them once enough time — five months — has passed since their last shot.

|
This image provided by Pfizer in October 2021 shows the company's COVID-19 Paxlovid pills. U.S. health regulators on Wednesday, Dec. 22, 2021 authorized the first pill against COVID-19, a Pfizer drug that Americans will be able to take at home to head off the worst effects of the virus. (Pfizer via AP)

The long-awaited milestone comes as U.S. cases, hospitalizations and deaths are all rising and health officials warn of a tsunami of new infections from the omicron variant that could overwhelm hospitals.

|
In this Dec. 15, 2020, file photo, a droplet falls from a syringe after a person was injected with the Pfizer COVID-19 vaccine at a hospital in Providence, R.I. (AP Photo / David Goldman, File)

Pfizer said Monday its COVID-19 vaccine works for children ages 5 to 11 and that it will seek U.S. authorization for this age group soon — a key step toward beginning vaccinations for youngsters.

|
(WTTW News)

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.

|
In this March 2, 2021, file photo, pharmacy technician Hollie Maloney loads a syringe with Pfizer's COVID-19 vaccine at the Portland Expo in Portland, Maine. (AP Photo / Robert F. Bukaty, File)

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.

|
In this Sunday, July 11, 2021 file photo, a doctor fills a syringe with the Johnson & Johnson COVID-19 vaccine at a vaccination center in Kabul, Afghanistan. (AP Photo / Rahmat Gul, file)

Just because Pfizer wants to offer COVID-19 vaccine boosters doesn’t mean people will be lining up anytime soon — U.S. and international health authorities say that for now, the fully vaccinated seem well protected.

|
In this May 11, 2021 file photo, Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases, speaks during a Senate Health, Education, Labor, and Pensions hearing to examine an update from Federal officials on efforts to combat COVID-19, on Capitol Hill  (Jim Lo Scalzo / Pool via AP, File)

Pfizer says it plans to meet with top U.S. health officials Monday to discuss the drugmaker’s request for federal authorization of a third dose of its COVID-19 vaccine as President Joe Biden’s chief medical adviser acknowledged that “it is entirely conceivable, maybe likely” that booster shots will be needed.

|
In this Jan. 24, 2021, file photo, a vial of the Pfizer vaccine for COVID-19 is shown at a one-day vaccination clinic set up in an Amazon.com facility in Seattle and operated by Virginia Mason Franciscan Health. (AP Photo / Ted S. Warren, File)

U.S. regulators on Monday expanded the use of Pfizer’s COVID-19 vaccine to children as young as 12, offering a way to protect the nation’s adolescents before they head back to school in the fall and paving the way for them to return to more normal activities.

|
In this Jan. 24, 2021, file photo, a vial of the Pfizer vaccine for COVID-19 is shown at a one-day vaccination clinic set up in an Amazon.com facility in Seattle and operated by Virginia Mason Franciscan Health. (AP Photo/Ted S. Warren, File)

Pfizer’s vaccine is authorized for ages 16 and older. Vaccinating children of all ages will be critical to stopping the pandemic — and helping schools, at least the upper grades, start to look a little more normal after months of disruption.

|
Sandra Lindsay, left, a nurse at Long Island Jewish Medical Center, is inoculated with the Pfizer-BioNTech COVID-19 vaccine by Dr. Michelle Chester, Monday, Dec. 14, 2020, in the Queens borough of New York. (AP Photo / Mark Lennihan, Pool)

The biggest vaccination campaign in U.S. history kicked off Monday as health workers rolled up their sleeves for shots to protect them from COVID-19 and start beating back the pandemic — a day of optimism even as the nation’s death toll closed in on 300,000.

|
Boxes containing the Pfizer-BioNTech COVID-19 vaccine are prepared to be shipped at the Pfizer Global Supply Kalamazoo manufacturing plant in Portage, Mich., Sunday, Dec. 13, 2020. (AP Photo / Morry Gash, Pool)

The first of many freezer-packed COVID-19 vaccine vials made their way to distribution sites across the United States on Sunday, as the nation’s pandemic deaths approached the horrifying new milestone of 300,000.

|
The Pfizer Global Supply Kalamazoo manufacturing plant is shown in Portage, Mich., Friday, Dec. 11, 2020. (AP Photo / Paul Sancya)

The nation’s first COVID-19 vaccine will begin arriving in states Monday morning, U.S. officials said Saturday, after the government gave the final go-ahead to the shots needed to end an outbreak that has killed nearly 300,000 Americans.

|
The Pfizer Global Supply Kalamazoo manufacturing plant is shown in Portage, Mich., Friday, Dec. 11, 2020. (AP Photo / Paul Sancya)

The U.S. gave the final go-ahead Friday to the nation’s first COVID-19 vaccine, marking what could be the beginning of the end of an outbreak that has killed nearly 300,000 Americans.