Coronavirus, any virus belonging family Coronaviridae. Coronaviruses have envloped virion virus particles) that measure approximately 120 nm (1 nm = 10−9 metre) in diameter. Club-shaped glycoprotein spikes in the envelope give the viruses a crownlike, or coronal, appearance. The nucleocapsid, made up of a protein shell known as a capsid and containing the viral Nucleic Acid is helical or tubular. The coronavirus genome consists of a single strand of positive-sense (ribonucleic acid) RNA.
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