"The PRAC has concluded that there is a possible link to rare cases of venous thromboembolism (VTE) with COVID-19 Vaccine Janssen," the committee meeting highlights stated.

Venous thromboembolism "is a condition in which a blood clot forms in a deep vein, usually in a leg, arm, or groin, and may travel to the lungs causing a blockage of the blood supply, with possible life-threatening consequences," the committee said.

Janssen, a J&J company, did not respond to a request for comment.

After reviewing new evidence, PRAC concluded that there is a "reasonable possibility" that the clotting condition is linked with vaccination using the J&J vaccine. The committee recommended listing venous thromboembolism as a rare side effect in the product information for the J&J vaccine.

The committee also found that the use of the J&J and the AstraZeneca vaccines is linked to an immune condition that causes the body's immune system to target healthy platelets needed for normal blood clotting.

"Very low levels of blood platelets can be associated with bleeding, and have serious health consequences," the committee said.

PRAC recommended listing the immune condition as an "adverse reaction with an unknown frequency" for both the J&J and the AstraZeneca vaccines.