ACE2 was found expressed in lungs, esophagus, ileum, colon, cholangio of liver, and bladder.22–25 Consistently, bronchoalveolar-lavage fluid,2 nasopharyngeal swabs,26 stool,27,28 and blood17 of COVID-19 patients were RT-PCR-positive for 2019-nCoV. This evidence concerns the gene ACE2 and COVID-19.