Nation CDC recommends masks for vaccinated people in high transmission areas. What does that mean? July 27, 2021July 28, 2021 Jeanine Santucci, USA TODAY Comments Off on CDC recommends masks for vaccinated people in high transmission areas. What does that mean? If you're in an area with high COVID-19 transmissibility, the CDC says vaccinated people need masks. Here's what that means and a map of those areas.