FDA authorizes new T-cell test that could be game changer for COVID-19 long haulers Tuesday, March 9 by ABC NewsBy SASHA PEZENIK, ABC News (NEW YORK) -- The first-of-its-kind test for detecting whether someone was infected with COVID-19 in the past -- using the body's T-cells -- was granted emergency authorization by the Food and Drug Administration late Friday night.This... Read More.