Hantaviruses are zoonotic viruses spreading from wild animals to humans, in which they mostly lead to silent infections but in unlucky cases produce hemorrhagic disease. Several types exist, but in relation to laboratory animals, the only type of interest is the Seoul Strain, producing inapparent infection in rats.165 It is found mainly in the Far East and in the European Balkan region.166 In other areas of the world, e.g., Scandinavia and United States, other types of Hantaviruses with specificity for other animal species may be found.167 Infections in laboratory animals are rare, but they have occurred after housing wild rodents in laboratory animal facilities.168 Current screening can easily be performed by serology.

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