As SARS-CoV-2 invades cells through binding to angiotensin-converting enzyme 2 (ACE2) [6], which is expressed in various tissues apart from the lungs [7], COVID-19 could cause multiple organ involvements including gastrointestinal infection [8, 9], and fecal samples have tested positive for the nucleic acid of SARS-CoV-2, however, this could be simultaneous with respiratory tract samples testing negative [10]. Here, ACE2 is linked to COVID-19.