The Danger of a ‘Dudes Only’ Vaccine

The Johnson & Johnson shot is teetering on the precipice of becoming America’s “dudes only” vaccine. On Tuesday, the CDC and FDA advised halting the vaccine’s nationwide rollout to investigate six cases of a rare blood-clotting disorder that’s occurred in people within about two weeks of receiving the vaccine—all of them women under the age of 50. In an emergency meeting convened Wednesday by the CDC, experts raised the possibility of limiting its future use to males, reserving Johnson & Johnson’s vaccine, as some have unfortunately put it, for johnsons alone.

That idea, crude though it may be, has something to it. The demographic pattern that’s emerged is striking, and many of the experts I talked with this week told me they suspect that, if the vaccine is ultimately linked to these clots, the relationship will come with a clear-cut sex or gender difference too. (These questions are also being debated with regard to the AstraZeneca vaccine, which contains comparable ingredients and might very rarely cause a similar or identical type of clotting disorder.)