Doctors urge North Texans to get vaccinated, mask up as CDC updates mask guidelines Doctors urge North Texans to get vaccinated, mask up as CDC updates mask guidelines The CDC now says even fully vaccinated people should wear masks indoors in regions where there is substantial virus transmission. That includes Texas. DALLAS - The CDC now says even fully vaccinated people should wear masks indoors in regions where there is substantial virus transmission. That includes Texas, where COVID-19 surveillance shows substantial or high spread across much of the state in the most recent weekly report. Some key indicators, including the positivity rate and hospitalizations, are going up in several counties.