April 13, 2021 — After receiving experiences of a uncommon blood clot in folks receiving the Johnson & Johnson COVID-19 vaccine, the FDA and the CDC have beneficial a pause in using the vaccine, pending additional investigation.

Right here, what it’s essential know:

Why was the pause prompt?

After reviewing knowledge, the businesses discovered six experiences of people that skilled uncommon blood clots together with low platelets, that are the smallest blood cells and concerned in clotting. The six experiences had been came upon of greater than 6.8 million doses given. The FDA and CDC initiated the pause ”out of an abundance of warning.”

What else is understood?

In accordance with a joint assertion issued by the CDC and FDA, all six instances had been in girls between ages 18-48. Signs occurred 6-13 days after vaccination. The kind of clot is understood medically as a cerebral venous sinus thrombosis (CVST) and was seen together with low ranges of blood platelets. Go right here to be taught extra about these types of blood clots. 

Of the six instances, one lady died; one other was in vital situation.

Remedy of this kind of clot is completely different from that for different varieties, the CDC and FDA say. Sometimes, an anticoagulant drug, heparin, is used. However for this kind of clot, different remedy could also be wanted.

Why does it occur?

“We do not have a definitive reply right now, but it surely seems to contain an immune response associated to the J&J vaccine that adversely impacts the perform of the platelets, which in flip prevents the traditional clotting course of from occurring,” says Robert Glatter, MD, emergency physician at Lenox Hill Hospital in New York Metropolis.

He says that the reason “could in the end be associated to the adenovirus vector [used in the vaccine] itself.”

Why does it appear to have an effect on girls greater than males?

That isn’t but identified, says William Schaffner, MD, professor of preventive drugs and infectious illness specialist at Vanderbilt College Medical Heart in Nashville. “This has been true for the AstraZeneca [vaccine] as properly and their blood clot points,” he says. Whether it is an immune-related difficulty, girls do are inclined to have extra of these points than males, generally, he says.

What ought to individuals who bought the J&J vaccine know and do?

Remember that the experiences of blood clots had been uncommon, Schaffner suggests. The probabilities are about 1 in one million, primarily based on the six experiences out of 6.8 million doses given. “That is truly a testomony to the sensitivity of our vaccine security system,” he says, that these few experiences could be detected out of thousands and thousands of doses.

Individuals who have gotten the vaccine ought to be vigilant of signs, the FDA and CDC say. If you happen to acquired the Johnson & Johnson vaccine and develop extreme headache, abdominal pain, leg ache, or shortness of breath inside 3 weeks of vaccination, contact your their well being care supplier.

How lengthy will the pause final?

That can be not but identified. The CDC’s Advisory Committee on Immunization Practices (ACIP) will meet on Wednesday to additional overview the instances and ”assess their potential significance.” FDA can be reviewing the information additional.

WebMD Well being Information


CDC: “Joint CDC and FDA Assertion on Johnson & Johnson COVID-19 Vaccine.”

Johnson & Johnson: “Johnson & Johnson Assertion on COVID-19 Vaccine.”

William Schaffner, MD, professor of preventive drugs and infectious illness specialist, Vanderbilt College Medical Heart, Nashville. 

Robert Glatter, MD, emergency doctor, Lenox Hill Hospital, New York Metropolis. 

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