SAN FRANCISCO — Officials at the University of California, San Francisco say a man in his 30s is recuperating after developing a rare blood clot in his leg within two weeks of receiving the Johnson & Johnson coronavirus vaccine.

As of Friday, the U.S. Centers for Disease Control and Prevention had reported the rare clots in 15 people, all women, after 8 million doses of the vaccine were administered nationally.

Federal officials lifted an 11-day pause on use of the single-shot vaccine Friday, saying the benefits outweighed the very rare risks.

The university said Monday that “to the best of our knowledge, this is the first male patient with VITT syndrome in the U.S.” It says the man was admitted 13 days after receiving the vaccination and should be released shortly.