[Epidemiological study of risk factors for Mycoplasma bovis infections in fattening calves]. / Epidemiologische Studie der Risikofaktoren für Mycoplasma bovis-Infektionen bei Mastkälbern.
Schweiz Arch Tierheilkd
; 143(9): 461-7, 2001 Sep.
Article
em De
| MEDLINE
| ID: mdl-11593902
ABSTRACT
To establish the role of Mycoplasma bovis as an agent of respiratory disease in fattening calves, an epidemiologic study was undertaken. A recently validated commercially available ELISA was used to diagnose M. bovis infection by seroconversion in paired sera obtained for each animal at entry in the fattening herd and at follow-up seven weeks later. Management data as well as relevant clinical and epidemiological variables were prospectively recorded. The overall seroconversion rate observed among the 415 calves in 23 fattening herds on 13 farms was 54.7%. Significant risk factors for seroconversion were the mixing of fattening herds of different age groups (risk ratio RR 1.70, 95% confidence interval (CI) 1.48 to 1.96), and the presence of at least one seropositive animal in the fattening herd (RR 2.02; CI 1.69 to 2.40). The proportion of clinical episodes of respiratory disease attributable to M. bovis infection was 50.3%. The average weight gain during the observation period was reduced by 7.6% in seroconverting calves and these animals had about 2 times more antibiotics prescribed by a veterinarian than calves remaining negative for M. bovis throughout follow-up (RR 1.83). Maternal antibodies against M. bovis were detected in 39% of newborn calves born from seronegative cows and had a half-life of 20 days, potentially limiting the usefulness of vaccines against M. bovis in this age group.
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Base de dados:
MEDLINE
Assunto principal:
Doenças Respiratórias
/
Doenças dos Bovinos
/
Infecções por Mycoplasma
Tipo de estudo:
Diagnostic_studies
/
Etiology_studies
/
Observational_studies
/
Risk_factors_studies
Limite:
Animals
Idioma:
De
Revista:
Schweiz Arch Tierheilkd
Ano de publicação:
2001
Tipo de documento:
Article