New York (CNN Business) Costco is requiring customers to wear face masks or coverings in its stores beginning May 4.not serve as a "substitute for The company is the largest US retailer to enact the rule, which is aimed at helping prevent the spread of Covid-19 . Costco said the face coverings must be worn "at all times" in the store and willnot serve as a "substitute for social distancing ." Certain exemptions are applied, including for customers under 2-years-old and people who can't wear one because of a medical condition. Costco COST has enacted a number of changes to its stores as shoppers flock to big box stores for necessities during the pandemic . Walmart WMT said in a statement to CNN Business that customer and employee safety is a "top priority" and it's recommending, not requiring, customers wear face coverings.

Source: CNN April 29, 2020 16:23 UTC