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. The shortages are the latest stumble in a botched effort to track the spread of coronavirus that has left the U.S. weeks behind many other developed countries. Dwindling supplies include both chemical components and basic swabs needed to collect patient samples. There are “acute, serious shortages across the board” for supplies needed to do the tests, said Eric Blank, of the Association of Public Health Laboratories, which represents state and local health labs. Late Friday, Blank’s group and two other public health organizations recommended that testing be scaled back due to “real, immediate, wide-scale shortages.” The groups said only patients with COVID-19 symptoms who are elderly, have high-risk medical conditions or are medical staff should be tested. “Testing for individuals who are not in these three groups is not recommended until sufficient testing supplies and capacity become more widely available,” said the joint statement, issued with the Association of State and Territorial Health Officials and the Council of

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