Farmers in parts of the UK have been put on alert as an outbreak of bluetongue has been detected, according to the government.
The virus is not an immediate threat to humans as it primarily affects cattle and sheep, but can be passed to dogs if they eat infected material. Outbreaks can lead to prolonged restrictions on animal movement and trade. Livestock owners must be vigilant for signs of bluetongue in their animals and report any suspicions.
The Department for Environment, Food and Rural Affairs (DEFRA) and the Animal Health and Plant Agency have extended a bluetongue restriction zone following a case discovered in Dorset. The zone now encompasses Dorset, as well as regions of Wiltshire, sections of Somerset and parts of East Devon.
The government has stated that we are currently in a ‘seasonally vector low period’, indicating a very low risk of bluetongue transmission. DEFRA revealed it found instances of the virus in cattle in Dorset, leading to the extension of the restricted zone into South Somerset on February 14.
Farmers and landowners must still obtain a licence to move animals or germinal product out of a restricted zone, arrange for a pre-movement test for all animals moving out of the restricted zone unless they are moving direct to slaughter or via a dedicated slaughter market.
Bluetongue is a serious disease caused by the bluetongue virus, which is primarily spread by biting midges. The virus affects sheep, cattle, other ruminants such as deer and goats, and camelids like llamas and alpacas. On rare occasions, dogs and other carnivores can contract bluetongue if they consume infected material, such as afterbirth. However, it does not affect humans or food safety.
The severity of the infection depends on the type of the virus and may also be affected by the strain. Sheep are more likely than cattle to show clear clinical signs of bluetongue if they become infected with the virus. These signs include ulcers or sores in the mouth and nose, discharge from the eyes or nose, drooling, swelling of the lips, tongue, head, neck and coronary band, red skin due to blood collecting beneath the surface, fever, lameness, breathing problems, abortion, foetal deformities, stillbirths, and death.
Lambs can become infected with bluetongue virus before birth if the dam is infected while pregnant. Signs of infection in lambs include being born small, weak, deformed or blind. In lambs, the signs of bluetongue can include death within a few days of birth and stillbirths.
In cattle, symptoms may range from lethargy, crusty erosions around the nostrils and muzzle, redness of the mouth, eyes, nose, reddening of the skin above the hoof, nasal discharge, reddening and erosions on the teats, fever, milk drop, not eating, to abortion, foetal deformities and stillbirths.
Adult cattle may be infectious for several weeks while showing little or no sign of disease. They are often the preferred host for biting midges, the vector of the bluetongue virus. Calves can become infected with the bluetongue virus before birth if the mother is infected while pregnant. Signs of infection in calves include being born small, weak, deformed or blind, death within a few days of birth, and stillbirths.
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