weren't MERS and SARS a type of coronavirus themselves? They pop up every once in a while
Coronaviruses were first discovered in the 1930s
Human coronaviruses were discovered in the 1960s. The earliest ones studied were from human patients with the
common cold, which were later named human coronavirus
229E and human coronavirus
OC43.
https://www.cdc.gov/coronavirus/types.htmlThe Flu (Influenza) affects the whole body, corona the upper respiratory tract.
https://en.wikipedia.org/wiki/Influenza