U.S. Calls for Pause on Johnson & Johnson Vaccine After “Rare and Severe” Blood Clotting Issues

The CDC and the FDA are recommending that the United States pause the use of Johnson & Johnson’s Covid-19 vaccine over six reported cases of a “rare and severe” blood clotting issue.

As of April 12, more than 6.8 million doses of the Johnson & Johnson vaccine have been administered in the U.S. CDC and FDA are reviewing data involving six reported U.S. cases of a rare and severe type of blood clot in individuals after receiving the J&J vaccine. In these cases, a type of blood clot called cerebral venous sinus thrombosis was seen in combination with low levels of blood platelets. All six cases occurred among women between the ages of 18 and 48, and symptoms occurred 6 to 13 days after vaccination. Treatment of this specific type of blood clot is different from the treatment that might typically be administered. Usually, an anticoagulant drug called heparin is used to treat blood clots. In this setting, administration of heparin may be dangerous, and alternative treatments need to be given.

People who have received the J&J vaccine who develop severe headache, abdominal pain, leg pain, or shortness of breath within three weeks after vaccination should contact their health care provider.

A special meeting of CDC’s Advisory Committee on Immunization Practices will be held Wednesday to review the data around the issue.

“Until that process is complete, we are recommending a pause in the use of this vaccine out of an abundance of caution,” the statement said. “This is important, in part, to ensure that the health care provider community is aware of the potential for these adverse events and can plan for proper recognition and management due to the unique treatment required with this type of blood clot.”


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