CDCâs revised masked guidance is met with mixed reactions from Shreveport residents Those who are fully vaccinated against COVID-19 no longer have to wear masks outdoors and in most indoor settings The CDC announced May 13, 2021, that people who are fully vaccinated against COVID-19 no longer have to wear masks outdoors and in most indoor settings. Like everyone else, the CDC says the more than 117 million Americans who have been fully vaccinated should continue to wear face masks in crowded environments like buses, planes, hospitals, prisons and homeless shelters. (Source: Cincinnati Zoo) By Chandler Watkins and Curtis Heyen | May 13, 2021 at 5:31 PM CDT - Updated May 13 at 8:00 PM