ACE2 and Middle East respiratory syndrome: That is because coronaviruses, including the severe acute respiratory syndrome coronavirus (SARS-CoV), the Middle East Respiratory Syndrome (MERS-CoV) and the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), use the angiotensin-converting enzyme 2 (ACE2) as their receptor in order to achieve their entrance in the host cell and trigger an immune reaction [2].