ACE2 and severe acute respiratory syndrome: It was named SARS-CoV-2 due to its relationship with the virus that causes Severe Acute Respiratory Syndrome (SARS) and the infection mechanism is relies on the protein “S”, which is composed of two subunits, S1, which contains the receptor-binding domains that recognizes and binds to the host receptor angiotensin-converting enzyme 2 (ACE-2), and subunit S2, which mediates viral cell membrane fusion [3].