Visna, a Lentiviral Disease of Sheep

  • Gudmundur Pétursson
  • Ólafur S. Andrésson
  • Gudmundur Georgsson
Part of the Infectious Agents and Pathogenesis book series (IAPA)


Visna (meaning wasting), an encephalomyelitis, and maedi (meaning dyspnea), an interstitial pneumonia of sheep, were brought to Iceland with imported Karakul sheep in 1933.1 Almost three decades elapsed until the causative agent of visna, a virus, was isolated from the central nervous system (CNS) of visnaaffected sheep.2 A few years later a virus was isolated from the lungs of a sheep with maedi.3 The viruses were shown to be serologically related, and early transmission experiments indicated that visna and maedi were but different organ manifestations of infection with the same virus,4 which is thus frequently referred to as maedi-visna virus (MVV).


Human Immunodeficiency Virus Feline Immunodeficiency Virus Equine Infectious Anemia Virus Infected Sheep Primary Demyelination 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Plenum Press, New York 1992

Authors and Affiliations

  • Gudmundur Pétursson
    • 1
  • Ólafur S. Andrésson
    • 1
  • Gudmundur Georgsson
    • 1
  1. 1.Institute for Experimental PathologyUniversity of IcelandReykjavikIceland

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