A Bay Area man was discovered to have been affected by the rare blood clot in his leg caused by the Johnson & Johnson coronavirus vaccine eight days after being given the shot, said a University of California, San Francisco spokesperson on Monday.

Officials believe it is the first case of the rare side effect from the Johnson & Johnson vaccine in a male. University of California, San Francisco doctors who were treating the patient said he was in stable condition and is expected to be discharged soon.

Rare Blood Clot

“This particular person had a more mild clot, and one in the leg. But certainly, it’s a real clot, and he’s in his early 30s, so likely could be linked to the vaccine,” the University of California, San Francisco Associate Division Chief & Professor of Medicine Dr. Monica Gandhi said.

Out of the eight million Johnson & Johnson vaccines administered in the United States, officials have recorded 15 cases of rare blood clot side effects. On Sunday, nine Bay Area health officers revealed in a joint statement their support to lift the ban of the vaccine. They said the treatment was effective and safe to use despite the reported side effects.

Gandhi said “they did the right thing, which is to put a warning label on it but not to stop the vaccine,” in response to people’s fears of the vaccine causing the side effect. “You are, as a woman, less likely to get the blood clot problem than to get struck by lightning next year,” the Director of the National Institutes of Health Dr. Francis Collins said.

Many residents across the Bay Area said they were not worried about the potential side effects of the Johnson & Johnson vaccine. “They’ve run thousands of tests on hundreds of thousands of people before, you know, so I wouldn’t be concerned,” Hayward resident Chef Q said.

Contra Costa County officials announced they would resume administering the Johnson & Johnson vaccine as early as Monday, NBC Bay Area reported.