The SARS CoV-2 spike glycoprotein initiates a viral infection through its attachment to angiotensin-converting enzyme 2 (ACE2) cell receptors, which are distributed widely in different organs, including oro/nasopharyngeal mucosae, the lungs, gastrointestinal tract (GIT) mucosae, the brain, kidneys and the liver (Hamming et al., 2004). This evidence concerns the gene ACE2 and viral infectious disease.