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As arboviruses (arthropod borne viruses) are present in the blood of infected animals, the Group uses blood samples to detect both antibody to the virus and the virus itself. Antibodies to bluetongue virus (BTV) can be detected within 2 hours, whilst the genetic material of the virus is detected within 6 hours . When the serotype of the virus needs to be determined, this is done by a polymerase chain reaction test in conjunction with the Arbovirology Group, and confirmed by virus neutralisation tests.
Following the 22nd of September 2007, when the Group first identified the presence of BTV serotype 8 in England, the number of blood samples that have been investigated by the Group has grown astronomically. Samples are received from all susceptible animals immediately and a week after the animals enter the UK. The lab also receives samples from animals showing BT-like symptoms (report cases) as well as from animals prior to export.