Boncristiani, H. F., Criado, M. F., & Arruda, E. (2009). Respiratory viruses. Encyclopedia of Microbiology, 500.

University of Michigan - Ann Arbor

Respiratory viruses are known as the major etiological agents of acute respiratory infections (ARIs).  They play a substantial role in morbidity and mortality all over the world.
Most typical respiratory viruses that circulate globally as endemic or epidemic agents are: influenza virus, respiratory syncytial virus, parainfluenza viruses, metapneumovirus, rhinovirus, coronaviruses, adenoviruses, and bocaviruses.

Respiratory Viruses

"Coronaviruses belong to the Coronaviridae family in the Nidovirales order."
Coronaviruses are named for the crown-like spikes on their surface. There are four main sub-groupings of coronaviruses, known as alpha, beta, gamma, and delta. 
Coronaviruses are ubiquitous among humans and animals. These viruses are enveloped, nonsegmented, positive-sense RNA viruses and have
the largest identified viral RNA genomes, with an approximate
length of 30 kilobases.

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