By CBSBoston.com Staff

(CBS) — McDonald’s is requiring workers and customers to wear masks again at most of its restaurants in the United States, regardless of whether or not they’ve been vaccinated.

The fast food chain with more than 14,000 locations in the country is following new guidance from the Centers For Disease Control. People in areas of substantial or high COVID transmission should wear masks because of the very contagious Delta variant, the CDC says.

READ MORE: Topsfield Fair Returns Friday After Year Off Due To Pandemic

CBS News reports that about 80% of counties in the U.S. have substantial or high transmission. In Massachusetts, the CDC says every county except Franklin and Hampshire has substantial or high transmission.

READ MORE: MBTA Says Inspectors Checked Escalator 3 Weeks Before It Malfunctioned

McDonald’s required masks for employees and customers beginning last summer but like many other businesses dropped the rule in May as COVID cases declined thanks to vaccinations.

MORE NEWS: I-Team: Consumers Report Car Dealers For Using Deceptive Advertising Tactics

Target announced this week it will bring back the mask requirement for employees in areas with substantial or high transmission rates.

CBSBoston.com Staff