First report of bovine neosporosis in dairy cattle in Costa Rica
NEOSPOROSIS has recently been recognised as a major cause of abortion in dairy cattle worldwide (Barr and others 1990, Duff and Otter 1994, Boulton and others 1995). The disease is caused by the protozoan parasite, Neospora caninum, which is closely related to Toxoplasma gondii (Dubey and Lindsa...
Autores Principales: | Pérez, E., González, O., Dolz, Gaby, Morales, Juan Alberto, Barr, B., Conrad, P. A. |
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Formato: | Artículo |
Idioma: | Inglés |
Publicado: |
British Veterinary Association
2022
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Materias: | |
Acceso en línea: |
http://hdl.handle.net/11056/23003 https://doi.org/10.1136/vr.142.19.520 |
Sumario: |
NEOSPOROSIS has recently been recognised as a major cause of
abortion in dairy cattle worldwide (Barr and others 1990, Duff
and Otter 1994, Boulton and others 1995). The disease is caused
by the protozoan parasite, Neospora caninum, which is closely
related to Toxoplasma gondii (Dubey and Lindsay 1993).Consequently, it may have a life cycle similar to T gondii, which
is transmitted by ingestion of oocysts in the faeces of a definitive
host or by oral or nasal exposure to tachyzoites or oral exposure to bradyzoites (Thurmond and others 1997). For N caninum, however,
vertical transmission is the major mode of transmission
(Anderson and others 1997).
In Costa Rica, a retrospective study (1987 to 1993) on 23 dairy
farms located in a tropical cloud forest ecosystem (Holdrige 1987)
found an overall abortion rate of 7-6 per cent (515 abortions out of
6741 animals calving). Consequently, a prospective study on the
same herds was planqed to determine the principal aetiological
agents associated with abortion. |
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