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In this May 19, 2021, file photo, a licensed practical nurse draws a Moderna COVID-19 vaccine into a syringe at a mass vaccination clinic at Gillette Stadium in Foxborough, Mass. (AP Photo/Steven Senne, File)

With many Americans who got Pfizer vaccinations already rolling up their sleeves for a booster shot, millions of others who received the Moderna or Johnson & Johnson vaccine wait anxiously to learn when it's their turn.

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In this March 26, 2021, file photo a member of the Philadelphia Fire Department prepares a dose of the Johnson & Johnson COVID-19 vaccine at a vaccination site setup in Philadelphia. (AP Photo / Matt Rourke, File)

Johnson & Johnson said Tuesday that a booster of its one-shot coronavirus vaccine provides a stronger immune response months after people receive a first dose.

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In this March 26, 2021, file photo a member of the Philadelphia Fire Department prepares a dose of the Johnson & Johnson COVID-19 vaccine at a vaccination site setup in Philadelphia. (AP Photo / Matt Rourke, File)

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.

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This Saturday, March 6, 2021 file photo shows vials of Johnson & Johnson COVID-19 vaccine at a pharmacy in Denver. (AP Photo / David Zalubowski, File)

The company said a Food and Drug Administration review concluded the shots remain safe and effective for at least 4 1/2 months. In February, the FDA originally authorized J&J’s vaccine for up to three months when stored at normal refrigeration levels.

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In this April 15, 2011, file photo, a bottle of Johnson’s baby powder is displayed. (AP Photo / Jeff Chiu, File)

The Supreme Court is leaving in place a $2 billion verdict in favor of women who claim they developed ovarian cancer from using Johnson & Johnson talc products.

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In this April 8, 2021 file photo, the Johnson & Johnson COVID-19 vaccine is seen at a pop up vaccination site in the Staten Island borough of New York. (AP Photo / Mary Altaffer, File)

With a green light from federal health officials, many states resumed use of the one-shot Johnson & Johnson coronavirus vaccine on Saturday. Among the venues where it was being deployed: the Indianapolis Motor Speedway.

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(WTTW News)

The Illinois Department of Public Health, the Chicago Department of Public Health and the Cook County Department of Public Health restarted administering the Johnson & Johnson vaccine on Saturday, as officials said it is safe and effective.

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In this March 3, 2021, file photo, U.S. Army medic Kristen Rogers, of Waxhaw, N.C., holds a vial of the Johnson & Johnson COVID-19 vaccine in North Miami, Fla. (AP Photo / Marta Lavandier, File)

U.S. health officials lifted an 11-day pause on COVID-19 vaccinations using Johnson & Johnson's single-dose shot on Friday, after scientific advisers decided its benefits outweigh a rare risk of blood clot.

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In this March 6, 2021, file photo, boxes stand next vials of Johnson & Johnson COVID-19 vaccine in the pharmacy of National Jewish Hospital for distribution in Denver. (AP Photo / David Zalubowski, File)

The United States will likely move to resume Johnson & Johnson’s COVID-19 vaccine this coming week, possibly with restrictions or broader warnings after reports of some very rare blood clot cases, the government’s top infectious diseases expert said Sunday.

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(WTTW News)

Health officials recommended a pause on the Johnson & Johnson COVID-19 vaccine this week after six people experienced rare but severe blood clots. We discuss the situation—and concerns about vaccine hesitancy—with Dr. Juanita Mora, an allergist and immunologist at the Chicago Allergy Center.

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In this March 3, 2021, file photo, Johnson & Johnson COVID-19 vaccine is held by pharmacist Madeline Acquilano at Hartford Hospital in Hartford, Conn. (AP Photo / Jessica Hill, File)

Johnson & Johnson’s COVID-19 vaccine will remain in limbo for a while longer after government health advisers declared Wednesday that they need more evidence to decide if a handful of unusual blood clots were linked to the shot — and if so, how big the risk really is.

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In this Thursday, April 8, 2021 file photo, the Johnson & Johnson COVID-19 vaccine sits on a table at a pop-up vaccinations site the Albanian Islamic Cultural Center, in the Staten Island borough of New York. (AP Photo / Mary Altaffer, File)

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.

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Gov. J.B. Pritzker receives the Johnson & Johnson COVID-19 vaccine on Wednesday, March 24, 2021 at a mass vaccination site in Springfield. (WTTW News)

Health officials said they were acting “out of an abundance of caution” following six cases of a rare and severe type of blood clot in individuals who got the one-dose Johnson & Johnson vaccine.

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This September 2020, file photo provided by Johnson & Johnson shows a pharmacist preparing to give an experimental COVID-19 vaccine. (Johnson & Johnson via AP, File)

The announcement comes as the White House looks to speed the production of the single-dose vaccine. Officials have said J&J faced unexpected production issues with its vaccine and produced only 3.9 million doses ahead of its receiving emergency use authorization on Saturday. 

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This September 2020, file photo provided by Johnson & Johnson shows a pharmacist preparing to give an experimental COVID-19 vaccine. (Johnson & Johnson via AP, File)

The U.S. is getting a third vaccine to prevent COVID-19, as the Food and Drug Administration on Saturday cleared a Johnson & Johnson shot that works with just one dose instead of two.

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This September 2020, file photo provided by Johnson & Johnson shows a pharmacist preparing to give an experimental COVID-19 vaccine. (Johnson & Johnson via AP, File)

U.S. health advisers endorsed a one-dose COVID-19 vaccine from Johnson & Johnson on Friday, putting the nation on the cusp of adding an easier-to-use option to fight the pandemic.