How many tests do we need? How should we use tests? For each case we know about, how many more cases are out there? Everyone asks the same important, interrelated questions. In one respect, the answer is the same for all of them: We must vastly expand our testing capacity. No country has controlled transmission effectively without massive testing capacity.
Regulatory and technical hurdles accounted for early delays. Now that we’re past those, several shortages are getting in the way. We don’t have enough protective equipment for testers, nor swabs for sampling or reagents to extract genetic material from the virus. We don’t have enough physical test kits, or enough human power to run large-scale testing. The result is that we have no idea how many people are infected with the coronavirus or how fast the virus is spreading.Marc Lipsitch, professor of epidemiology and the director of the Center for Communicable Disease Dynamics at the Harvard T.H. Chan School of Public Health
Far more people in the U.S. have the coronavirus than you think. Washington Post