What scientists call “breakthrough” infections in people who are fully vaccinated make up a small fraction of cases. With the Games soon to start, Kara Eaker, a member of the U.S. women’s gymnastic team who said she was vaccinated, tested positive in a training camp just outside Tokyo. One critical question about breakthrough cases is whether the person actually had symptoms, said Dr. Francis Collins, director of the National Institutes of Health. AdvertisementBreakthrough cases tend to be mild because a vaccinated person’s immune system doesn’t have to start from scratch to fight the coronavirus. And the government is watching closely for signs that breakthrough cases, especially serious ones, are rising, because that might signal the need for booster vaccinations.
Source: Los Angeles Times July 21, 2021 20:37 UTC