Coronaviruses are recognized by club-shaped surface projections that are 20 nm long and resemble solar coronas. These viruses are characterized by their ability to

Coronaviruses, discovered in 1965, are thought to be a major agent of the common cold, especially in older children and adults. The virion is known to contain RNA, but other elements of its structure are unclear. At 34degC, viral multiplication is profuse; however, infectivity is greatly reduced at higher temperatures or following extended incubation Reference: Ananthanarayan and Paniker&;s Textbook of Microbiology Tenth edition