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  • Title: [Bovine virus diarrhea/mucosal disease: a review].
    Author: Weiss M, Hertig C, Strasser M, Vogt HR, Peterhans E.
    Journal: Schweiz Arch Tierheilkd; 1994; 136(5):173-85. PubMed ID: 8036482.
    Abstract:
    Infections with the Bovine Viral Diarrhea/Mucosal Disease Virus (BVDV) are widespread and cause a variety of diseases including reproductive disorders, abortion and malformation, pneumoenteritis, thrombocytopenia and mucosal disease. Together with the closely related border disease virus of sheep (BDV) and European Swine fever virus (CSFV), also referred to as Hog Cholera virus, BVDV is now classified in the genus pestivirus of the Flaviviridae family. The BVDV exists in two biotypes, noncytopathic and cytopathic, the latter differing in structural proteins from the noncytopathic biotypes. In virus-free animals infection is transient and mostly subclinical or mild but may also lead to an array of diverse symptoms such as pneumoenteritis (often in combination with other microorganisms). Infection of the developing fetus early in gestation with a noncytopathic biotype of BVDV may result in persistent infection and birth of apparently healthy calves. Such calves may later in their lives develop Mucosal Disease, a lethal course of infection associated with a mutation to the cytopathic biotype or superinfection with a cytopathic BVDV antigenically similar to the non-cytopathic virus already present in these animals. Diagnosis of infections with BVDV is based on the clinical symptoms and demonstration of virus. Paired serum samples allow the detection of seroconversion in acute infections while persistently infected animals are immunotolerant and generally lack antiviral antibody. Although generally found in their respective host species, pestiviruses of cattle, sheep and pigs are capable of crossing the species barrier into the other species. The existence of pestiviruses in wild ruminants and boars may complicate control strategies that are aimed at removing virus carriers and the control of animal movements.
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