Where won't you have to wear a mask after the vaccine and in what cases? As new information becomes available, the CDC updated guidance for fully vaccinated people, including changes for mask-wearing and social distancing. LEE SMITH REUTERS Maine Senator Susan Collins told CDC Director Rochelle Walensky that she “ Always considered the CDC to be the gold standard," but after seeing the agencies response to the pandemic, she doesn't anymore. The Senator's criticism stems from what she sees as the confusion created by the delays in the agency adjusting their public health guidance. Part of the Senator’s argument is based on how the agency has released information for fully vaccinated individuals.