Washington (CNN)The US Centers for Disease Control and Prevention on Tuesday changed its masking recommendations as it grows more concerned over the Delta variant of Covid-19, urging vaccinated people in certain areas of the country to resume wearing masks indoors in public areas.

On May 13, the Center for Disease Control (CDC) changed its COVID-19 masking guidelines, announcing fully vaccinated Americans could now unmask indoors.

Secretary of Health Dr. Rachel Levine announced four new mitigation efforts that the Wolf Administration will be taking to slow the spread of COVID-19 in the state during a remote press conference on Tuesday.

Beginning today, anyone leaving their homes are required to wear a mask to help prevent the spread of COVID-19, according to an order issued by Secretary of Health Dr. Rachel Levine.

Starting Sunday, employers must require all employees and customers to wear masks at work, under an order issued today by state Health Secretary Rachel Levine. The order also requires companies to provide masks for workers, and deny entry to customers who are not wearing one.

York County’s mass transit service, Rabbittransit, said it will begin turning passengers away that aren’t wearing face masks next week.