Covid19 components
SARS-CoV-2 is a single-stranded virus with the genome size is 29.891 kb long(29891 nucleotides) encoding 9860 amino acids(Cai, Tu et al. 2020). which belongs to genus Coronavirus  and family Coronaviridae (Chan, Kok, et al. 2020). With the Virion size that ranging from 70 to 90 nm Spike, membrane, and envelope surface viral proteins of coronavirus are embedded in host membrane-derived lipid bilayer encapsulating the helical nucleocapsid comprising viral RNA. The genome comprises of 6–11 open reading frames (ORFs) with 5′ and 3′ flanking untranslated regions (UTRs) (Kumar, Nyodu, et al. 2020). classified into the subfamily Coronavirinae  that consists of four genera Alphacoronavirus (αCoV ),Betacoronavirus  (βCoV), Gammacoronavirus  (γCoV), and Deltacoronavirus  (δCoV) (Cui, Li et al. 2019). As in the figure, 1 showed the high-resolution crystal structure of the virus and depicted the external components that contain four structural proteins, namely envelope (E), spike (S), membrane (M), and nucleocapsid (N). The S, M, and E proteins together form the envelope of the virus, positive-sense,  spherical to pleomorphic particles, measuring between 80 and 160 nm in length(Xia, Liu, et al. 2020).