A technician prepares coronavirus test samples on New York’s Long Island. The head of New York City’s public labs said fighting the virus without a test was like building a house with a saw but no hammer.

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)