Walmart is once again requiring employees wear masks inside.
The new policy is effective immediately in places with substantial or high transmission of COVID-19.
Masks will still be optional for customers.
Walmart ditched its mask mandate in May
But re-evaluated the policy after the Centers for Disease Control and Prevention updated its guidance this week because of surging COVID-19 cases.
The CDC now recommends fully vaccinated people resume wearing masks indoors in areas with high transmission of COVID-19 and its Delta Variant.
That includes nearly two thirds of all US counties.
Other large retailers like Target, Trader Joe’s, and Costco are also re-evaluating their masks policies.