At least one volunteer in a vaccine study also developed unusual blood clots after receiving coronavirus vaccine from Johnson & Johnson, a top official at the company said on Wednesday.
Dr. Aran Maree, chief physician at J&J vaccine arm Janssen, said blood clots were seen in two patients in Phase 3 vaccine studies – one who was vaccinated and one who was given a placebo shot.
Maree also explained a seventh possible case at an emergency meeting of the Advisory Committee on Immunization Practices of the U.S. Centers for Disease Control and Prevention.
During the Phase 3 study of the single-dose vaccine, there was a case of the affected type of blood clot known as cerebral venous sinus thrombosis (CVST) in September, Maree said. It was a 25-year-old white man who has recovered. In addition, a 59-year-old woman developed a series of blood clots known as deep vein thrombosis, or DVTs.
The company is looking for more possible cases, Maree said.
“There is also an ongoing study, a large open-label study, of South African health professionals. There are currently 272,438 participants enrolled,” Maree said. “We haven’t received any reports of CVST. We had one case of pulmonary embolism.”
A pulmonary embolism is a blood clot in the lungs.
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