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Prevalence of antibodies to Leptospira interrogans serovar hardjo in bulk tank milk from unvaccinated irish dairy herds.

Leonard N, Mee JF, Snijders S, Mackie D - Ir Vet J (2004)

Bottom Line: Both the probability of a herd being seropositive and the antibody level in the herd milk sample were affected by the province (P < 0.05 and P < 0.01, respectively) and the herd size category (P < 0.05 and P < 0.01, respectively).Larger herds were significantly more likely to have positive reactions and higher mean concentrations of antibody.It was concluded that a high proportion of unvaccinated Irish dairy herds have been exposed to infection with Leptospira hardjo.

View Article: PubMed Central - HTML - PubMed

Affiliation: Faculty of Veterinary Medicine, University College Dublin, Belfield, Dublin 4, Ireland. nola.leonard@ucd.ie.

ABSTRACT
: Bulk tank milk samples, collected from 347 herds throughout the Republic of Ireland using a sampling frame based on seven milk-recording organisations, were tested by ELISA for antibodies to Leptospira interrogans serovar hardjo. These herds, which had not been vaccinated against leptospirosis within the previous five years, were categorised according to their province, milk-recording organisation and size. Two-hundred-and-seventy-three herds (79%) had a positive ELISA titre. Both the probability of a herd being seropositive and the antibody level in the herd milk sample were affected by the province (P < 0.05 and P < 0.01, respectively) and the herd size category (P < 0.05 and P < 0.01, respectively). Larger herds were significantly more likely to have positive reactions and higher mean concentrations of antibody. It was concluded that a high proportion of unvaccinated Irish dairy herds have been exposed to infection with Leptospira hardjo.

No MeSH data available.


Related in: MedlinePlus

Location of the seven milk-recording organisations within the four provinces of Ireland that participated in a survey of anti-Leptospira antibodies in bulk tank milk. DG = Dairygold Ltd; GV = Golden Vale; Kerry = Kerry Agribusiness; NCF = North Connacht Farmers Co-op Society Ltd.; NECBS = North Eastern Cattle Breeders Society; PG = Progressive Genetics; SWS = South Western Services.
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Figure 1: Location of the seven milk-recording organisations within the four provinces of Ireland that participated in a survey of anti-Leptospira antibodies in bulk tank milk. DG = Dairygold Ltd; GV = Golden Vale; Kerry = Kerry Agribusiness; NCF = North Connacht Farmers Co-op Society Ltd.; NECBS = North Eastern Cattle Breeders Society; PG = Progressive Genetics; SWS = South Western Services.

Mentions: Only herds that had not been vaccinated against leptospirosis during the previous five years were selected. Samples were collected through the Irish Dairy Records Company and their associated co-operative milk-recording organisations, based throughout the Republic of Ireland (Figure 1). The sample frame was stratified according to milk-recording organisation and herd size category (Table 1). Numbers of samples to be collected in each herd size category were calculated using data from the Central Statistics Office Census of Agriculture, 1991, which comprised the most recent data available, on farms classified by number of dairy cows in each province.


Prevalence of antibodies to Leptospira interrogans serovar hardjo in bulk tank milk from unvaccinated irish dairy herds.

Leonard N, Mee JF, Snijders S, Mackie D - Ir Vet J (2004)

Location of the seven milk-recording organisations within the four provinces of Ireland that participated in a survey of anti-Leptospira antibodies in bulk tank milk. DG = Dairygold Ltd; GV = Golden Vale; Kerry = Kerry Agribusiness; NCF = North Connacht Farmers Co-op Society Ltd.; NECBS = North Eastern Cattle Breeders Society; PG = Progressive Genetics; SWS = South Western Services.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3113821&req=5

Figure 1: Location of the seven milk-recording organisations within the four provinces of Ireland that participated in a survey of anti-Leptospira antibodies in bulk tank milk. DG = Dairygold Ltd; GV = Golden Vale; Kerry = Kerry Agribusiness; NCF = North Connacht Farmers Co-op Society Ltd.; NECBS = North Eastern Cattle Breeders Society; PG = Progressive Genetics; SWS = South Western Services.
Mentions: Only herds that had not been vaccinated against leptospirosis during the previous five years were selected. Samples were collected through the Irish Dairy Records Company and their associated co-operative milk-recording organisations, based throughout the Republic of Ireland (Figure 1). The sample frame was stratified according to milk-recording organisation and herd size category (Table 1). Numbers of samples to be collected in each herd size category were calculated using data from the Central Statistics Office Census of Agriculture, 1991, which comprised the most recent data available, on farms classified by number of dairy cows in each province.

Bottom Line: Both the probability of a herd being seropositive and the antibody level in the herd milk sample were affected by the province (P < 0.05 and P < 0.01, respectively) and the herd size category (P < 0.05 and P < 0.01, respectively).Larger herds were significantly more likely to have positive reactions and higher mean concentrations of antibody.It was concluded that a high proportion of unvaccinated Irish dairy herds have been exposed to infection with Leptospira hardjo.

View Article: PubMed Central - HTML - PubMed

Affiliation: Faculty of Veterinary Medicine, University College Dublin, Belfield, Dublin 4, Ireland. nola.leonard@ucd.ie.

ABSTRACT
: Bulk tank milk samples, collected from 347 herds throughout the Republic of Ireland using a sampling frame based on seven milk-recording organisations, were tested by ELISA for antibodies to Leptospira interrogans serovar hardjo. These herds, which had not been vaccinated against leptospirosis within the previous five years, were categorised according to their province, milk-recording organisation and size. Two-hundred-and-seventy-three herds (79%) had a positive ELISA titre. Both the probability of a herd being seropositive and the antibody level in the herd milk sample were affected by the province (P < 0.05 and P < 0.01, respectively) and the herd size category (P < 0.05 and P < 0.01, respectively). Larger herds were significantly more likely to have positive reactions and higher mean concentrations of antibody. It was concluded that a high proportion of unvaccinated Irish dairy herds have been exposed to infection with Leptospira hardjo.

No MeSH data available.


Related in: MedlinePlus