Seasonal variation of Fasciola hepatica antibodies in dairy herds in Northern Ireland measured by bulk tank milk ELISA
| Autor: | Maria Guelbenzu-Gonzalo, Andrew W. Byrne, James McConville, R.E.B. Hanna, Georgina Milne, Stanley W. J. McDowell, Jordon Graham |
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| Rok vydání: | 2018 |
| Předmět: |
0301 basic medicine
Veterinary medicine Fascioliasis 040301 veterinary sciences animal diseases Climate Antibodies Helminth Cattle Diseases Enzyme-Linked Immunosorbent Assay Northern Ireland 0403 veterinary science 03 medical and health sciences parasitic diseases medicine Prevalence Fasciola hepatica Parasite hosting Bulk tank Animals Fasciolosis Prospective Studies Dairy farming General Veterinary biology 04 agricultural and veterinary sciences General Medicine 030108 mycology & parasitology Liver fluke Seasonality biology.organism_classification medicine.disease Infectious Diseases Milk Liver Insect Science Herd Parasitology Cattle Female |
| Zdroj: | Parasitology research. 117(9) |
| ISSN: | 1432-1955 |
| Popis: | Bovine fasciolosis, caused by the infection of the trematode parasite Fasciola hepatica, remains a problem in dairy herds causing significant production losses. In this study, bulk milk tank samples were utilised to generate a comprehensive survey of the variation in liver fluke exposure over the four seasons of 2016 in Northern Ireland (NI). Samples were tested using an antibody ELISA test; within-herd prevalence levels were categorised relative to sample-to-positive ratio (S/P%). Overall, 1494 herds (~ 50% of all active dairy farms in NI) were sampled. In total, 5750 samples were tested with 91% of herds having a sample result for each season. The proportion of herds with evidence of liver fluke exposure was very high across the year, with 93.03% of all bulk milk samples having some indication of liver fluke antibody presence. A high proportion of samples (2187/5750; 38.03%) fell within the highest infection class (indicating high within-herd prevalence). There was significant seasonal variation in the mean S/P%. A multivariable random effect ordinal logit model suggested that the greatest probability of being in a higher infection class was in winter, whilst the lowest was recorded during summer. There was a significant negative association between increasing herd liver fluke infection class and herd size. Furthermore, there was significant variation in infection levels across regions of Northern Ireland, with higher infection levels in northern administrative areas. This study demonstrates the very high liver fluke exposure in this region of Europe, and that risk is not equally distributed spatially or across seasons in dairy herds. |
| Databáze: | OpenAIRE |
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