Coronaviruses (CoVs) are a highly diverse family of enveloped positive-sense single-stranded RNA viruses. They infect humans, other mammals and avian species, including livestock and companion animals, and are therefore not only a challenge for public health but also a veterinary and economic concern.

Current taxonomy divides the subfamily Coronavirinae into four genera:

Alphacoronavirus (which includes viruses previously in group 1)

Betacoronavirus (which includes viruses previously in group 2, most notably SARS-CoV and MERS-CoV)

Gammacoronavirus (which includes viruses previously in group 3)

Deltacoronavirus (which includes several newly described avian and swine viruses).

Examples of ds RNA virus: Reoviridae

Examples of ss DNA virus:Canine Parvovirus

Examples of ds DNA virus: Herpes virus

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