On Monday, Aug. 2, McDonald’s Corp said that all customers and employees, whether vaccinated or not, will be required to wear masks inside its U.S. restaurants in areas with high or considerable transmission.

As USA Today reports, with 14,000 locations across the United States, McDonald’s is the largest national corporation to adopt a mask requirement for employees and customers.

The change came after the Centers for Disease Control and Prevention (CDC) recommended last week that fully vaccinated persons wear masks in some indoor spaces, contradicting its former guideline that fully vaccinated people could go maskless in most scenarios.

Other large retailers, such as Walmart, Target, and Kohl’s, have reinstated mask requirements for their employees but have refrained from enforcing them for consumers. Instead, they are urging clients to wear masks, The Hill reported.

Last week, Apple became the first big corporation to reinstate its mask requirement for both staff and customers, citing a need for caution.

USA Today reports that Apple’s mask rule will only affect around half of its 270 locations in the U.S.

According to the latest CDC data, Covid-19 instances increased by 64.1 percent in the week ending July 30 compared to the previous week, or an average of 66,606 cases per day. The Centers for Disease Control and Prevention (CDC) reported a seven-day average of 6,071 new hospital admissions with Covid-19, up 44 percent from the average for the week of July 16-22. According to the Wall Street Journal, CDC Director Rochelle Walensky stated that more than 97 percent of Covid-19 patients entering hospitals nationwide were unvaccinated.