Apparent prevalence of and risk factors for infection with Ostertagia ostertagi, Fasciola hepatica and Dictyocaulus viviparus in Swiss dairy herds.

Frey, Caroline; Eicher, R; Raue, K; Strube, C; Bodmer, Michèle; Hentrich, Brigitte; Gottstein, Bruno; Marreros Canales, Nelson Antonio (2017). Apparent prevalence of and risk factors for infection with Ostertagia ostertagi, Fasciola hepatica and Dictyocaulus viviparus in Swiss dairy herds. Veterinary parasitology, 250, pp. 52-59. Elsevier 10.1016/j.vetpar.2017.12.004

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Infections with helminth parasites can negatively affect performance of dairy cows. Knowledge on infection intensity, spatial distributions and risk factors are key to develop targeted treatment strategies. Canada and most EU countries have conducted large investigations, but respective data for Switzerland were missing. We now performed a bulk tank milk serosurvey for Ostertagia ostertagi, Fasciola hepatica, and Dictyocaulus viviparus on a total of 1036 voluntarily participating dairy herds that were sampled at confinement periods, i.e. in winter 2014/15 or 2015/16, respectively. All samples were analyzed with commercial ELISAs for antibodies (AB) against O. ostertagi and F. hepatica, and those of the first sampling period additionally with an in-house ELISA for AB against D. viviparus. Testing for the latter parasite was not done in the second year of the study, as the sampling period might have missed infections due to the short lived nature of specific antibodies. The possible influence of geographic, climatic, and farm management variables on AB levels were assessed for each parasite using scanning cluster and multiple regression analysis. Overall seroprevalence for O. ostertagi was 95.5% (95% C.I.: 94.0-96.6), with a mean optical density ratio (ODR) of 0.83, for F. hepatica 41.3% (95% C.I.: 38.3-44.4), and for D. viviparus 2.9% (95% C.I.: 1.6-4.7). There were no significant differences between the two sampling periods. For all parasites, significant geographic clusters of higher AB levels could be established. Furthermore, AB levels against all three parasites were positively correlated with each other, indicating either cross-reactions or co-infections. For O. ostertagi, herd size and percentage of pasture in the ration were positively correlated with AB levels. For F. hepatica, altitude above sea level (a.s.l.) positively, and milk production per cow and year was negatively correlated with AB levels. This work provides baseline data for further studies performing in-depth risk factor analysis and investigating management as well as targeted treatment options to control the parasites.

Item Type:

Journal Article (Original Article)

Division/Institute:

05 Veterinary Medicine > Research Foci > Veterinary Public Health / Herd Health Management
05 Veterinary Medicine > Department of Infectious Diseases and Pathobiology (DIP) > Institute of Parasitology
05 Veterinary Medicine > Department of Clinical Veterinary Medicine (DKV)
05 Veterinary Medicine > Department of Clinical Veterinary Medicine (DKV) > Clinic for Ruminants
05 Veterinary Medicine > Department of Infectious Diseases and Pathobiology (DIP)

UniBE Contributor:

Frey, Caroline; Bodmer, Michèle; Hentrich, Brigitte; Gottstein, Bruno and Marreros Canales, Nelson Antonio

Subjects:

600 Technology > 630 Agriculture
600 Technology > 610 Medicine & health

ISSN:

0304-4017

Publisher:

Elsevier

Language:

English

Submitter:

Daniela Fasel

Date Deposited:

10 Apr 2018 16:31

Last Modified:

21 Nov 2018 10:56

Publisher DOI:

10.1016/j.vetpar.2017.12.004

PubMed ID:

29329624

Uncontrolled Keywords:

Dictyocaulus viviparus ELISA Fasciola hepatica Ostertagia ostertagi Prevalence Risk factors Switzerland

BORIS DOI:

10.7892/boris.109105

URI:

https://boris.unibe.ch/id/eprint/109105

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