The scientists, along with officials at the Massachusetts Department of Public Health, reported that 79 percent of vaccinated breakthrough infections were symptomatic. Four of five people who were hospitalized were fully vaccinated. They are analyzing the genetic fingerprints of the virus samples taken now to trace chains of transmission and determine how commonly fully vaccinated people were infecting one another. The presence of similar amounts of virus in the noses of vaccinated and unvaccinated people raises the possibility they are both contributing to spread, but many scientists think that vaccinated people should be less likely to spread the virus.

Source: Washington Post July 30, 2021 17:02 UTC