Can You Still Spread COVID-19 After You Get Vaccinated?

Pfizer and Moderna say their vaccines are about 95% effective at preventing people from getting sick with COVID symptoms. Preliminary evidence from Moderna showed that participants in a clinical trial who received the vaccine and were tested for COVID between their first and second doses had a roughly two-thirds reduction in asymptomatic infections. "That means there’s a substantial, substantial reduction in overall infections just from that first dose," said Deepta Bhattacharya, an associate professor of immunobiology at the University of Arizona College of Medicine – Tucson.