licase transcriptase complex. The remaining genome part of the virus encodes the mRNA which produces the structural proteins, i.e., spike, envelope, membrane, and nucleocapsid, and other accessory proteins.[9] Another important envelop-associated protein which is expressed by only some strains of CoV is the HE protein.[10] The RNA genome of CoV is packed in the nucleocapsid protein and further covered with envelope.[11]

Molecular Basics of Transmission of Coronavirus
In case of SARS-CoV, transmission is through droplet infection (respiratory secretions) and close