Walmart drops masks for vaccinated shoppers and workers. Other retailers say "not so fast."

Businesses large and small are grappling with how to adapt to the Centers for Disease Control and Prevention's surprise guidance on Thursday that Americans who are vaccinated against COVID-19 can hang up their masks.

The CDC's announcement that people who are fully vaccinated can go maskless indoors is leaving companies across the country scrambling over how to align the new recommendations with their own safety practices, including whether to treat inoculated customers and employees differently from people who have yet to get their shots. Some of the nation's largest retailers said Friday they have no immediate plans to change their policies and would continue requiring both customers and workers to wear masks while on the premises. Other businesses said they're re-evaluating their protocols, while tourism players like Disney are chomping at the proverbial bit to ease mask rules for visitors. Grocery chain Trader Joe's became the first prominent U.S. retailer Friday to drop its mask policies for vaccinated shoppers.