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==Description==  

==Description==  

Leptospirosis is an economically significant zoonotic disease caused by the bacteria [[Leptospira|''leptospira interrogans'']]. ''L. interrogans'' serovar ''hardjo'' is host-adapted to cattle  

Leptospirosis is an economically significant zoonotic disease caused by the bacteria [[Leptospira|''leptospira interrogans'']]. ''L. interrogans'' serovar ''hardjo'' is host-adapted to cattle; disease in cattle is usually due to ''L.pomona'' or ''L.hardjo''. Clinical disease is rarely seen in sheep, they are less susceptible to the bacterium but may act as non-symptomatic carriers. 

***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