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Researchers at the University of Arizona made 1,600 coronavirus test kits over the weekend amid a nationwide shortage in supplies for testing patients.

The researchers will produce an additional 3,000 to 4,000 kits in the coming week for the Pima County Health Department and the university’s Campus Health Service, said David Harris, director of the university’s Health Sciences Biorepository. The researchers can also supply Banner Health with test kits, if it needs them, he said.

The researchers worked extra hours in an assembly line to produce the kits over the weekend.

“Fortunately, our personnel at the Biorepository have several decades of experience in creating biospecimen collection kits,” Harris said in a news release Monday.

They are exactly like the ones supplied by the federal government, he said later on a conference call with media.