[[File:Brucelliosis.jpg|right|thumb|250px|<small><center> Swollen caribou “knee” joint due to brucellosis. (Wildlife Alaska
[[File:Brucelliosis.jpg|right|thumb|250px|<small><center> Swollen caribou “knee” joint due to brucellosis. (Wildlife Alaska
2008, Wikimedia commons)</center></small>]]
2008, Wikimedia commons)</center></small>]]
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''Brucella abortus'' is a species of the ''[[Brucella species - Overview|Brucella]]'' bacteria genus and causes [[Brucellosis - Cattle|bovine brucellosis]].
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''Brucella abortus'' is a species of the ''[[Brucella species - Overview|Brucella]]'' bacteria genus and causes [[Brucellosis - Cattle|bovine brucellosis]]. It mainly affects cattle, where transmission is by ingestion and abortion occurs in the last half of pregnancy. The placenta is covered by fibrinonecrotic tissue and the foetus often shows bronchopneumonia.
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''B.abortus'' uncommonly localises in joints, usually in '''carpal bursitis (hygroma)''' in cattle and '''bursitis''' in horses.
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''B.abortus'' uncommonly localises in joints, usually in '''carpal bursitis (hygroma)''' in cattle and '''bursitis''' in horses. Also in spleen and lymphatic tissue of non-pregnant animals. It has been isolated from closed cases of [[Bursae and Tendons Inflammatory - Pathology#Poll Evil and Fistulous Withers|poll evil and fistulous withers]] in horses.
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It affects cattle, transmission is by ingestion and abortion occurs in the last half of pregnancy. The placenta is covered by fibrinonecrotic tissue and the foetus often shows bronchopneumonia.