ACE2 and infection: It is believed that the receptor, angiotensin-converting enzyme-2 (ACE2; protein found on surface of cells), and TMPRSS2 (a gene that encode for transmembrane protease enzyme and belong to serine protease family) are expressed in lung tissues and epithelial cells, which are employed by CoV to establish infection in the lungs (Ozma et al., 2020; Porfidia and Pola, 2020).