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 currently has three coronavirus test sites open.

The company plans to have more than 20 coronavirus testing sites operating in at least 10 states by the end of April, the company told Business Insider on Monday.

"We currently have three sites open, and we have plans to expand testing to multiple sites next week with the goal of having more than 20 sites in more than 10 states by the end of the month," a Walmart spokesperson said. "We have been learning a lot from our initial sites so that we can get the model right and are working hard to help expand testing in areas of need as quickly as possible."

The spokesperson added: "We remain committed to supporting government efforts to expand COVID-19 drive-thru testing during this critical time, and we are working closely with Quest Diagnostics, HHS, and several states to open sites in areas of need."

The sites are staffed by the US Department of Health and Human Services, as well as Walmart pharmacists who volunteered to support the locations.

Rite Aid said Tuesday that it's planning to open drive-up coronavirus testing sites in Pennsylvania, New York, New Jersey, Ohio, Michigan, Connecticut, and Virginia. The new sites will open in the next several weeks, the company said.

Rite Aid is currently operating just two testing sites in Philadelphia and Harrisburg, Pennsylvania.

These sites offer self-swab nasal tests — meaning patients obtain their own nasal samples with a swab — which are overseen by Rite Aid pharmacists.

"Through our partnership with the White House Coronavirus Task Force, and with tremendous support from state and local officials, we will significantly expand COVID-19 testing to more than 5,000 tests daily in our country's key hot spots when fully operational," Heyward Donigan, Rite Aid president and CEO, said in a statement.

To receive a test, people must pre-register online and schedule an appointment. The tests are free for people who meet criteria for testing laid out by the Centers for Disease Control.

Walgreens recently said it was planning to open 15 drive-thru testing locations across seven states.

The company said it would be able to test up to 3,000 people per day across these additional sites, which were expected to begin operating last week.

The company did not respond to Business Insider's request for comment on the status of the sites.

"We have learned a tremendous amount since opening our first government-run drive through testing location on March 21, including the amount of tests we can perform in our parking lots, which we expect to increase by using Abbott's new ID NOW COVID-19 test," the company said in a press release.

Target said in March that it planned to partner with the federal government to facilitate public access to coronavirus testing centers.

In response to Business Insider's request for comment, Target shared a statement from the company's coronavirus hub on its website.

"Since then, we continue to work with federal, state and local officials and task force partners to identify parking lot locations to serve as temporary testing sites," the company's statement said.

The statement also confirmed that there is currently one open coronavirus testing site in the parking lot of a Chula Vista, California store, which is being operated by the University of California, San Diego (UCSD).

"We stand committed to offering our parking lot locations and supporting the efforts of federal, state and local officials, as needed," Target added in its statement.

CVS has opened three rapid drive-thru testing locations in Georgia, Massachusetts and Rhode Island in collaboration with federal and state officials, a company spokesperson confirmed to Business Insider.

The tests are conducted using the new Abbott ID NOW COVID-19 test, which can detect positive results in as little as five minutes and negative results in as little as 13 minutes, a CVS press release explained.

"We're in discussions with numerous other states about the potential to open additional sites and we will share more details when they are available," the spokesperson added.