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Costco will start requiring customers to wear masks Monday

FILE - In this March 20, 2020 file photo, shoppers line up to enter a Costco store in Tacoma, Wash. Americans are beginning to see the first economic impact payments hit their bank accounts this week. The IRS tweeted Saturday, April 11, 2020, that it had begun depositing funds into taxpayers bank accounts and would be working to get them out as fast as it can.  (AP Photo/Ted S. Warren, Fle)
FILE - In this March 20, 2020 file photo, shoppers line up to enter a Costco store in Tacoma, Wash. Americans are beginning to see the first economic impact payments hit their bank accounts this week. The IRS tweeted Saturday, April 11, 2020, that it had begun depositing funds into taxpayers bank accounts and would be working to get them out as fast as it can. (AP Photo/Ted S. Warren, Fle) (Copyright 2020 The Associated Press. All rights reserved.)

(CNN) -- Costco is requiring customers to wear face masks or coverings in its stores beginning May 4.

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 will not 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 announced the changes Wednesday on its website.

Costco has enacted a number of changes to its stores as shoppers flock to big box stores for necessities during the pandemic. Other changes include earlier closing times, limiting the number of guests a member can bring and giving first responders and healthcare workers priority admittance into warehouses.

Several, but not all, US states are requiring shoppers to wear masks when they visit essential businesses. Earlier in April, the Centers for Disease Control and Prevention recommended people wear face coverings in public, but it's not yet required.

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