A panel of independent experts advising the C.D.C. will vote on the Johnson & Johnson vaccine pause.

An advisory committee for the Centers for Disease Control and Prevention will meet on Wednesday afternoon to debate whether or not the Johnson & Johnson Covid-19 vaccine should remain paused whereas a attainable hyperlink to uncommon blood clots is investigated.

The emergency assembly follows the Food and Drug Administration’s announcement on Tuesday that it was learning six instances of uncommon and extreme blood clots in girls aged 18 to 48, one of whom died. All of the girls had obtained the Johnson & Johnson vaccine earlier than creating the clots, though it is unclear whether the vaccine is responsible. As of Tuesday, greater than seven million folks in the United States have obtained the shot, and one other 10 million doses have been shipped out to the states, based on C.D.C. knowledge.

Following the name from federal well being businesses, all 50 states, Washington, D.C., and Puerto Rico on Tuesday rapidly paused or really helpful that suppliers pause the administration of the vaccine. The U.S. army, federally run vaccination websites, and a bunch of non-public corporations, together with CVS, Walgreens, Rite Aid, Walmart and Publix additionally paused the injections.

The Advisory Committee on Immunization Practices, or ACIP, is a panel of independent experts who advise the C.D.C. on its vaccine insurance policies. At the assembly, the experts will be reviewing and debating the knowledge from the six instances, and listening to feedback from the public, earlier than taking a vote on proceed. They may vote to advocate that the pause continues, for instance, or to specify that it ought to apply solely to a sure age or intercourse.

Federal officers mentioned on Tuesday that the pause would possibly final only some days, although it depended on what officers realized in the investigation. They mentioned that the pause will give officers extra time to alert docs that sufferers who’ve these uncommon blood clots shouldn’t be given the drug heparin, the normal therapy that docs administer for typical clots, and likewise present time to find out whether or not there are any extra instances.

The clotting dysfunction of concern in the vaccine recipients is totally different — and far rarer — than typical blood clots, which develop in lots of of hundreds of folks yearly. The six girls had not solely clotting in the mind, however a notably low degree of platelets, components of the blood that assist kind regular clots.

“Right now, we believe these events to be extremely rare, but we are also not yet certain we have heard about all possible cases, as this syndrome may not be easily recognized as one associated with the vaccine,” Dr. Rochelle P. Walensky, the C.D.C. director, mentioned at a White House information convention on the pandemic on Wednesday.

The U.S. surgeon basic, Dr. Vivek Murthy, reiterated on Wednesday that the pause in Johnson & Johnson vaccinations provides public well being officers an opportunity to research the instances and talk about them with well being care professionals. He added that pauses are frequent when new vaccines and medicines are rolled out.

“We’re just doing the due diligence we need to do to make sure everything is safe so we can continue with our vaccination efforts,” Dr. Murthy mentioned on “CBS This Morning.”

The committee’s evaluation will be essential at a time when the nation is racing to vaccinate as many individuals as attainable to curb the regular accumulation of instances, significantly as worrisome variants acquire traction. Some public well being experts had been disenchanted in the F.D.A.’s advice to droop the Johnson & Johnson vaccine, arguing that stopping these extraordinarily uncommon unintended effects was not worth the trade-off of slowing the vaccination marketing campaign and doubtlessly eroding the public’s belief of vaccines normally.

At the information convention, Jeffrey D. Zients, the White House’s pandemic coordinator, mentioned that the pause wouldn’t usually interrupt the momentum of the nation’s vaccination marketing campaign.

“In the very short term, we do expect some impact on daily averages as sites and appointments transition from Johnson & Johnson to Moderna and Pfizer vaccines,” he mentioned. “We have more than enough Pfizer and Moderna vaccine supply to continue or even accelerate the current pace of vaccinations.”

Madeleine Ngo contributed reporting.

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