Prevalence and distribution of paratuberculosis (Johne's disease) in cattle herds in Ireland

Irish Veterinary Journal

P Mullowney¹  J Egan³  T O'Brien³  D Yearsely³  H Sheridan¹  T Clegg²  M Good¹ 

[1] Department of Agriculture, Fisheries and Food, Kildare Street, Dublin 2, Ireland;Centre for Veterinary Epidemiology and Risk Analysis, UCD Agriculture, Food Science and Veterinary Medicine, University College Dublin, Belfield, Dublin 4, Ireland;Central Veterinary Research Laboratory, Backweston Campus, Young's Cross, Celbridge, Co. Kildare, Ireland

关键词: Paratuberculosis;    Mycobacterium avium subspecies paratuberculosis;    Johne's disease;    Ireland;    herd ELISA-prevalence;   

Others  :  1149796
DOI  :  10.1186/2046-0481-62-9-597

【 摘 要 】

A simple random survey was conducted in Ireland during 2005 to estimate the ELISA-prevalence of paratuberculosis, commonly called Johne's disease (JD), in the cattle population. Serum samples were collected from all 20,322 females/breeding bulls over 12 months-of-age in 639 herds. All samples were tested using a commercially available absorbed ELISA. The overall prevalence of infected herds, based on the presence of at least one ELISA-positive animal, was 21.4% (95% CI 18.4%-24.9%). Herd prevalence levels amongst dairy herds (mean 31.5%; 95% CI: 24.6%, 39.3%) was higher than among beef herds (mean 17.9%; 95% CI: 14.6%-21.8%). However, the animal level prevalence was similar. The true prevalence among all animals tested, was calculated to be 2.86% (95%CI: 2.76, 2.97) and for animals >= 2 yrs, it was 3.30% (95%CI: 3.17, 3.43). For animals in beef herds, true prevalence was 3.09% (95%CI: 2.93, 3.24), and for those in dairy herds, 2.74% (95%CI: 2.59, 2.90). The majority of herds had only one ELISA-positive infected animal. Only 6.4% (95% CI 4.7%-8.7%) of all herds had more than one ELISA-positive infected animal; 13.3% (CI 8.7%-19.7%) of dairy herds ranging from two to eight ELISA-positive infected animals; and, 3.9% beef herds (CI 2.4%-6.2%) ranging from two to five ELISA-positive infected animals. The true prevalence of herds infected and shedding Mycobacterium avium subspecies paratuberculosis is estimated to be 9.5% for all herd types; 20.6% for dairy herds; and 7.6% for beef herds. If ELISA positive animals <2-years-of-age are excluded, the true herd prevalene reduces to: 9.3% for all herd types; 19.6% for dairy herds; and 6.3% for beef herds based on a test specificity (Sp) of 99.8% and test sensitivity (Se) (i.e., ability to detect culture-positive, infected animals shedding at any level) of 27.8-28.9%.

   

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Figure 1.

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