US virus testing faces new headwind: Lab supply shortages

FILE - In this Wednesday, March 11, 2020 file photo, a technician prepares COVID-19 coronavirus patient samples for testing at a laboratory in New York’s Long Island. Wide scale testing is a critical part of tracking and containing infectious diseases. But the U.S. effort has been plagued by a series of missteps, including accuracy problems with the test kits the CDC sent to other labs and bureaucratic hurdles that slowed the entrance of large, private sector labs. (AP Photo/John Minchillo)

WASHINGTON — First, some of the coronavirus tests didn’t work. Then there weren’t enough to go around. Now, just as the federal government tries to ramp up nationwide screening, laboratory workers are warning of a new roadblock: dire shortages of testing supplies.