US recommends 'pause' for J&J vaccine over clot reports

April 13, 2021
FILE - 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. The U.S. is recommending a “pause” in administration of the single-dose Johnson & Johnson COVID-19 vaccine to investigate reports of potentially dangerous blood clots. (AP Photo/Mary Altaffer, File)

WASHINGTON (AP) — The U.S. on Tuesday recommended a “pause” in using the single-dose Johnson & Johnson COVID-19 vaccine to investigate reports of rare but potentially dangerous blood clots, a development that could jeopardise the rollout of vaccines around the world.

The Centers for Disease Control and Prevention and the Food and Drug Administration announced that they were investigating unusual clots that occurred 6 to 13 days after vaccination. The FDA commissioner said she expected the pause to last a matter of days.

The clots occurred in veins that drain blood from the brain and occurred together with low platelets, the fragments in blood that normally form clots. All six cases were in women between the ages of 18 and 48. One person died, and all of the cases remain under investigation.

More than 6.8 million doses of the J&J vaccine have been given in the U.S., the vast majority with no or mild side effects.

Any slowdown in the dissemination of the shots could have broad implications for the global vaccination effort. The J&J vaccine held particular promise for less affluent countries because its single-dose regimen and relatively simple storage requirements make it easier to use in the developing world.

The reports appear similar to a rare, unusual type of clotting disorder that European authorities say is possibly linked to another COVID-19 vaccine not yet cleared in the U.S., from AstraZeneca.

Federally run mass vaccination sites will pause the use of the J&J shot, and states and other providers are expected to follow. The other two authorized vaccines, from Moderna and Pfizer, make up the vast share of COVID-19 shots administered in the U.S. and are not affected by the pause.

“I’d like to stress these events appear to be extremely rare. However COVID-19 vaccine safety is a top priority,” acting FDA Commissioner Janet Woodcock said at a news conference.

A CDC committee will meet Wednesday to discuss the cases, and the FDA has also launched an investigation into the cause of the clots and low platelet counts.

Authorities have not seen similar clots after use of the Pfizer or Moderna vaccines, the CDC’s Dr. Anne Schuchat said.

FDA officials emphasized that Tuesday’s action was not a mandate. Doctors and patients could still use J&J’s vaccine if they decide its benefits outweigh its risks for individual cases, said Dr. Peter Marks.

The agencies recommend that people who were given the J&J vaccine should contact their doctor is they experience severe headache, abdominal pain, leg pain, or shortness of breath within three weeks.

J&J said in a statement that it was aware of the reports of blood clots, but that no link to its vaccine had been established. The company also said it would delay the rollout of its vaccine in Europe as a precaution.

U.S. health authorities cautioned doctors against using a typical clot treatment, the blood-thinner heparin. “In this setting, administration of heparin may be dangerous and alternative treatments need to be given,” the FDA and CDC said.

European authorities investigating the AstraZeneca cases have concluded clots appear to be similar to a very rare abnormal immune response that sometimes strikes people treated with heparin, leading to a temporary clotting disorder.

While it’s not clear yet if the reports among J&J recipients are related, doctors would treat these kinds of unusual clots like they treat people who have the heparin reaction — with different kinds of blood thinners and sometimes an antibody infusion, said Dr. Geoffrey Barnes, a clot expert at the University of Michigan.

As authorities investigate whether the clots really are related to the J&J vaccine, Barnes stressed that Americans should get vaccinated as soon as possible using the other two available vaccines, from Pfizer and Moderna.

“If you have a chance to get vaccinated with those, we strongly encourage it. The risks of COVID are real and they’re high,” Barnes said.

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