Rochelle Walensky, director of the Centers for Disease Control and Prevention (CDC), has sent mixed messages about the likelihood that people vaccinated against COVID-19 will be infected by the delta variant of the coronavirus. While she has described so-called breakthrough infections as “rare” and this week reiterated the point that vaccinated people face a “far lower” infection risk than unvaccinated people, she also has offered an estimate implying the reverse: that vaccination somehow makes people more vulnerable to infection.
