Coronaviruses are a large family of viruses which include the common cold and Sars (severe acute respiratory syndrome). They cause respiratory infections in humans and animals, with four or five strains currently affecting humans. They are a species in the genera of virus belonging to the subfamily Coronavirinae in the family Coronaviridae. 

Researchers found Mers-like antibodies in camels.Photo: AP

Arabian camel may host deadly Mers virus

The exact origin of the virus is a riddle scientists have been working hard to solve to halt its spread, especially in the lead-up to the annual haj pilgrimage to Saudi Arabia in October.