Walmart, CVS, and Target promised to help fight coronavirus by rolling out testing centers, but only a handful are now operating. Here's the latest on the White House-led project.

• Walmart, Target, CVS, and Rite Aid updated Business Insider on the status of their efforts with the White House to set up coronavirus test sites.
• Fewer than 25 testing sites are now open, but retailers say more are planned in the coming weeks.
• The White House did not respond to a request for comment.
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President Donald Trump announced plans in mid-March to launch more coronavirus testing sites with the help of major retailers such as Walmart, Target, Rite Aid, and CVS.

One month later, fewer than 20 of these sites are operating. But retailers say more test sites are in the works.

Here's an update on where things stand from each company partnering with the White House to expand coronavirus testing.