Federal health officials have now confirmed 28 cases, including six in men, of a rare blood clotting disorder in adults who have received the Johnson & Johnson Covid-19 vaccine.
Dr. Tom Shimabukuro, the deputy director of the immunization safety office at the Centers for Disease Control and Prevention, presented the new cases on Wednesday at a meeting of a panel of advisers to the C.D.C.
The figure is an increase from the 15 confirmed cases, all of which were in women, that were reported at last month’s meeting.
Although officials have now identified a handful of cases in men, women – especially those between the ages of 30 and 49 – appear to remain at elevated risk. “The trend is that the reporting rates are higher in females compared to males in all age categories,” Dr. Shimabukuro said at the meeting.