<unk>  is a genus of animal virus belonging to the family Coronaviridae.<unk> , named due to the "crown" like appearance of its surface projections, was first isolated from chickens in 1937. In 1965, Tyrrell and Bynoe used cultures of human ciliated embryonal trachea to propagate the first human<unk>  (HCoV) in vitro. There are now approximately 15 species in this family, which infect not only humans but cattle, pigs, rodents, cats, dogs and birds (some are serious veterinary pathogens, especially chickens).<unk>  gained international popularity after the deadly SARS epidemic caused by SARS-CoV in 2002 - 2003. A novel<unk>  known as the MERS-CoV was the highlight of the year 2012 when it caused the Middle East respiratory syndrome (MERS) epidemic. 2019 Novel<unk>  (2019-nCoV) is a virus identified as the cause of an outbreak of respiratory illness first detected in Wuhan, China. Based on the grouping,<unk>  can be classified into three groups. It can also be classified into families based on the genome and the method of replication. The virus can also be classified based on human infectivity.
Coronavirus
Hantavirus
Arenavirus
Arbovirus
Marnavirus
Varicosavirus
Endornavirus
Enterovirus