Walmart Inc. will require customers to wear face coverings inside all of its U.S. Walmart and Sam’s Club stores starting July 20, becoming the largest company to impose restrictions amid a surge in coronavirus cases in several U.S. states.

Walmart follows a handful of national chains—including Best Buy Co., Starbucks Corp. and Costco Wholesale Corp.—to require face masks as companies try to protect its staff and customers against the pathogen.

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