https://www.cnn.com/2021/07/27/health/cdc-mask-guidance-vaccinated-people-bn/index.html https://www.cnn.com/2021/07/27/health/cdc-mask-guidance-vacc... There a

https://www.cnn.com/2021/07/27/health/cdc-mask-guidance-vaccinated-people-bn/index.html https://www.cnn.com/2021/07/27/health/cdc-mask-guidance-vacc... There are many more breakthrough cases with the delta variant. That said, the vaccines are still very good at combatting serious illness: We continue to estimate that the risk of a breakthrough infection with symptom upon exposure to the Delta variant is reduced by seven-fold. The reduction of 20-fold for hospitalizations, and deaths," Walensky said during Tuesday's briefing.