Coronaviruses are enveloped, single stranded, positive-sense RNA viruses (27-31kb) with club-shaped surface about 120-160 nm in diameter that resemble a “corona”. Both 5' and 3' ends of the genome have a cap and poly (A) tract respectively. The envelope consists of two viral-specified structural glycoproteins S and M. Glycoprotein S's located on the outer membrane of the envelope and's responsible for the club-shaped projections. On the other hand, glycoprotein M's a transmembrane m… (More on Coronaviridae)