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Titolo:
The relationship between the occurrence of undifferentiated bovine respiratory disease and titer changes to Haemophilus somnus and Mannheimia haemolytica at 3 Ontario feedlots
Autore:
OConnor, A; Martin, SW; Nagy, E; Menzies, P; Harland, R;
Indirizzi:
Univ Guelph, Dept Populat Med, Guelph, ON N1G 2W1, Canada Univ Guelph Guelph ON Canada N1G 2W1 ulat Med, Guelph, ON N1G 2W1, Canada Univ Guelph, Dept Pathobiol, Guelph, ON N1G 2W1, Canada Univ Guelph Guelph ON Canada N1G 2W1 athobiol, Guelph, ON N1G 2W1, Canada Univ Guelph, Novartis Anim Hlth Inc, Guelph, ON N1G 2W1, Canada Univ Guelph Guelph ON Canada N1G 2W1 Hlth Inc, Guelph, ON N1G 2W1, Canada
Titolo Testata:
CANADIAN JOURNAL OF VETERINARY RESEARCH-REVUE CANADIENNE DE RECHERCHE VETERINAIRE
fascicolo: 3, volume: 65, anno: 2001,
pagine: 143 - 150
SICI:
0830-9000(200107)65:3<143:TRBTOO>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
WEIGHT-GAIN; PASTEURELLA-HAEMOLYTICA; CALVES; VACCINATION; ASSOCIATION; PATHOGENS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
13
Recensione:
Indirizzi per estratti:
Indirizzo: O'Connor, A Iowa State Univ Sci & Technol, Dept Vet Diagnost & Prod Anim Med, Ames, IA50011 USA Iowa State Univ Sci & Technol Ames IA USA 50011 , IA50011 USA
Citazione:
A. O'Connor et al., "The relationship between the occurrence of undifferentiated bovine respiratory disease and titer changes to Haemophilus somnus and Mannheimia haemolytica at 3 Ontario feedlots", CAN J VET R, 65(3), 2001, pp. 143-150

Abstract

The association between exposure to Haemophilus somnus and Mannheimia haemolytica (formerly Pasteurella haemolytica) and the risk of undifferentiatedbovine respiratory disease (UBRD) was investigated using serological evidence of exposure coupled with a factorial design vaccine field trial. Measures of previous exposure (titer at arrival) and current exposure (titer increase in the study period) to these agents were used. The vaccine field trial involved systematic allocation of animals into groups that received either a M. haemolytica vaccine, an H. somnus vaccine, a combined M. haemolyticaand H. sommus vaccine, and an unvaccinated control group. Serum was collected from the 852 animals enrolled to determine titers to H. sommus, M. haemolytica, bovine coronavirus and bovine viral diarrhea virus. Vaccination with H. somnus in combination with M. haemolytica and with M. haemolytica alone reduced the risk of UBRD. The odds ratio for vaccination with H. somnus alone and UBRD risk suggested some sparing effect, but the 95% confidence limits included unity. There was no association between serological evidenceof concurrent exposure to M. haemolytica and UBRD occurrence, There was anassociation between titer change to H. somnus and UBRD risk. However, the association changed with time of BRD treatment; animals diagnosed and treated for UBRD on or after day 10 showed little evidence of exposure to H. somnus, despite evidence of natural H. somnus exposure in the unvaccinated group. The association between titer change to H. somnus and UBRD occurrence seen in this study may be a consequence of prolonged exposure to antibiotics, rather than a causal association.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/01/20 alle ore 22:22:03