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  • Title: The length of BTV-8 viraemia in cattle according to infection doses and diagnostic techniques.
    Author: Di Gialleonardo L, Migliaccio P, Teodori L, Savini G.
    Journal: Res Vet Sci; 2011 Oct; 91(2):316-20. PubMed ID: 21324498.
    Abstract:
    Four groups of BTV free Frisian and cross bred calves were used to determine the length of viraemia following infection with different doses of BTV-8 Italian isolate. The first group of five animals was infected with 10 TCID(50) of BTV-8, the second group of four animals with 10(3) TCID(50) and the third group, which also included four animals, was infected with 10(6) TCID(50). A placebo containing uninfected tissue culture medium was given to the four animals of the fourth group. The viraemia was evaluated by real time RT-PCR and virus isolation. In all infected groups, virus isolation was able to detect infectious virus up to 39 days post infection (dpi) while RT-PCR was positive up to 151-157dpi. Infectious dose did influence neither the length nor the pattern of BTV-8 viraemia and confirmed that real time RT-PCR remains positive although no circulating virus is detectable in the peripheral circulation.
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