Well it's a coronavirus... Like MERS and sars-cov, like some "common cold"... Hence the false positives https://en.wikipedia.org/wiki/Coronavirus >>Coronaviruses are a group of related RNA viruses that cause diseases in mammals and birds. In humans and birds, they cause respiratory tract infections that can range from mild to lethal. Mild illnesses in humans include some cases of the **common cold** (which is also caused by other viruses, predominantly rhinoviruses), while more lethal varieties can cause SARS, MERS, and COVID-19. In cows and pigs they cause diarrhea, while in mice they cause hepatitis and encephalomyelitis. https://en.wikipedia.org/wiki/Coronavirus#Infection_in_humans >>Four human coronaviruses produce symptoms that are generally mild, even though it is contended they might have been more aggressive in the past:[92] Human coronavirus OC43 (HCoV-OC43), β-CoV Human coronavirus HKU1 (HCoV-HKU1), β-CoV Human coronavirus 229E (HCoV-229E), α-CoV Human coronavirus NL63 (HCoV-NL63), α-CoV Three human coronaviruses produce potentially severe symptoms: Severe acute respiratory syndrome coronavirus (SARS-CoV), β-CoV (identified in 2003) Middle East respiratory syndrome-related coronavirus (MERS-CoV), β-CoV (identified in 2012) Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), β-CoV (identified in 2019) These cause the diseases commonly called SARS, MERS, and COVID-19 respectively.