JANUARY 19TH, 2021,POSTED BY FABIENNE LANDRY-MCGILL “Previous studies on the performance of saliva tests showed mixed results, but most of them compared saliva tests to the standard nasal swab test, as if it was a perfect test,” says Guillaume Butler-Laporte. “Interestingly, there are no perfect tests for COVID-19.” (Credit: Omar Marques/Getty Images) Two new studies...