Two new studies from the Centers for Disease Control and Prevention show fully vaccinated Americans’ immunity to Covid-19 is waning as the more-transmissible Delta variant continues to spread across the country.
One study, which focused on frontline healthcare workers, found that vaccine effectiveness declined by nearly thirty percentage points since the Delta variant became the dominant strain in the U.S. The analysis also concluded that the Covid-19 vaccines were 80 percent effective in preventing infection among the frontline healthcare workers.
The second study examined 43,000 Los Angeles residents age 16 and older. It found that 25 percent of new infections from May to July were in fully vaccinated individuals, while 71 percent occurred in unvaccinated people. The study also showed that the hospitalization rate was significantly lower for fully vaccinated people than for unvaccinated people.