Bluetongue viruses are a group of arboviruses transmitted by Culicoides midges to ruminants. The spelling of bluetongue viruses is phonetically transcribed as bluːtʌŋ vʌɪrʌsɪz. The "ue" in "blue" is pronounced as "uː," while "tongue" is pronounced as "tʌŋ." The phonetic transcription also reveals the emphasis on the first syllable of "virus," which is pronounced as "vʌɪrʌsɪz." With this spelling, it becomes easier for scientists and veterinarians to accurately identify, communicate and understand the nature of bluetongue viruses.
Bluetongue viruses (BTV) are a group of insect-transmitted viruses that primarily affect ruminant animals such as sheep, goats, and cattle. They belong to the genus Orbivirus, family Reoviridae. Bluetongue viruses are named after a characteristic clinical sign in infected animals, which is the appearance of cyanosis or blue discoloration of the tongue due to tissue damage and hemorrhaging.
These viruses are transmitted by biting insects, particularly certain species of midges in the Culicoides genus. The virus replicates in the midge and is then transmitted to the host animal through the insect's feeding process. It cannot be directly transmitted from one animal to another or through non-biting insects. Bluetongue viruses can cause a range of clinical symptoms including fever, fatigue, nasal discharge, swollen and inflamed lips, mouth ulcers, lameness, and in severe cases, death.
Bluetongue viruses are of significant concern in the agricultural industry as they can cause substantial economic losses due to reduced productivity, decreased reproductive performance, and mortality in infected animals. Furthermore, they can also impact international trade of animals and animal products due to their notifiable status in many countries.
Control measures for bluetongue viruses include vaccination, vector control by reducing breeding sites and insecticide use, movement restrictions on infected animals, and surveillance to detect and monitor the spread of the disease. Additionally, good animal husbandry practices, such as quarantine and biosecurity measures, can help prevent the introduction and spread of bluetongue viruses in livestock populations.
The word "Bluetongue" is derived from the characteristic blue discoloration of the tongue that occurs in infected animals, particularly sheep. It was first described in the English language, likely originating from the blue coloration of the tongue. The term "Viruses" refers to the plural form of the word "virus", which comes from the Latin word "virus" meaning "poison" or "slimy liquid". So, "Bluetongue Viruses" refers specifically to the group of viruses that cause Bluetongue disease.