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In the mid-sixties of the previous century, the first two human coronaviruses (HCoV) were identified: HCoV-229E and HCoV-OC43 (29, 50, 70). These two human coronaviruses were studied extensively from approximately 1965 to the mid-1980s (7, 37, 49, 50, 57, 70). HCoV-229E is a member of the group I coronaviruses, and HCoV-OC43 is a member of group II. Besides the human coronaviruses, there are several group I and group II animal coronaviruses that infect cattle, pigs, cats, dogs, mice, and other animals (33). There is one additional branch, the group III coronaviruses, which are found exclusively in birds (33).

The Novel Human Coronaviruses NL63 and HKU1