noun. A viral disease of sheep and cattle that is transmitted by biting insects and is characterized by fever, the formation of oral lesions, and swelling and cyanosis of the lips and tongue.

noun. A disease of ruminants, caused by a virus of the genus Orbivirus, carried by mosquitos, midges etc

noun. a viral disease of sheep and cattle that is transmitted by biting midges

"The NFU advised farmers to support their JAB campaign, which aims to get all cattle and sheep vaccinated against the bluetongue, which is caused by a virus spread by certain types of biting midges."

catarrhal fever