Seroprevalence to Leptospira interrogans serovar hardjo in merino stud rams in South Australia.
Aust Vet J
; 71(7): 203-6, 1994 Jul.
Article
en En
| MEDLINE
| ID: mdl-7945098
ABSTRACT
A serological survey of 2160 Merino stud rams on 36 farms detected positive reactions greater than or equal to 1/100 in 42% of animals using the microscopic agglutination test (MAT) to Leptospira interrogans serovar hardjo. Twenty flocks had seroprevalence values greater than 30% with 15 flocks having values > or = 60%. The enzyme-linked immunosorbent assays showed that 47% and 3% of rams on the 36 farms were positive for IgG and IgM antibodies, respectively. Forty-five percent of hardjo reactions were in rams that had not been exposed to cattle. Significant correlations were found between IgM reactors and creek/dam water pumped into troughs, and between MAT/IgG reactors and total flock size. No statistical relationships were detected between positive reactors and two different annual average rainfall gradients, the time of the year in which samples were obtained, or agricultural regions of South Australia. Infections with an organism of the Sejroe serogroup is widespread in Merino stud rams.
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Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Enfermedades de las Ovejas
/
Leptospira interrogans
/
Leptospirosis
/
Anticuerpos Antibacterianos
Tipo de estudio:
Diagnostic_studies
/
Prevalence_studies
/
Risk_factors_studies
Límite:
Animals
País/Región como asunto:
Oceania
Idioma:
En
Revista:
Aust Vet J
Año:
1994
Tipo del documento:
Article