Leptospirosis is a zoonotic disease which affects animlas and humans caused by the bacteria [[Leptospira|''leptospira interrogans'']]. ''L. interrogans'' serovar ''hardjo'' is host-adapted to cattle
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**Cattle and sheep
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***Cattle are maintenance hosts for ''L. borgpetersenii'' serovar ''hardjo''
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***''L. interrogans'' serovar ''hardjo'' is host-adapted to cattle
***Acute disease in susceptible heifers, with fever and agalactia of all quarters; abortion and stillbirth may occur
***Acute disease in susceptible heifers, with fever and agalactia of all quarters; abortion and stillbirth may occur
***Diagnosed by rising antibody titre in paired serum samples
***Diagnosed by rising antibody titre in paired serum samples