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Herd-Level Risk Factors for the Seropositivity to Mycoplasma hyopneumoniae and the Occurrence of Enzootic Pneumonia Among Fattening Pigs in Areas of Endemic Infection and High Pig Density

Nathues, H; Chang, Y M; Wieland, B; Rechter, G; Spergser, J; Rosengarten, R; Kreienbrock, L; Beilage, E G

Authors

H Nathues

Y M Chang

B Wieland

G Rechter

J Spergser

R Rosengarten

L Kreienbrock

E G Beilage



Abstract

The aim of the present study was to identify potential risk factors for the occurrence of enzootic pneumonia (EP) in herds situated in a region of high pig density, where a majority of herds is endemically infected with Mycoplasma hyopneumoniae. Between 2006 and 2010, overall 100 herds were enrolled in a case–control study. Data were collected through personal interview with the farmers, clinical examination of pigs and their environments, and serological testing for M. hyopneumoniae, swine influenza virus and porcine reproductive and respiratory syndrome virus. There were 40 case herds (coughing index high, seroprevalence high) with a mean coughing index of 4.3 and a seroprevalence of 86.6%. There were two control groups. Control group I consisted of 25 herds (coughing index low, seroprevalence low) with mean values of 0.7 and 11.2%, and 35 herds were allocated to control group II (coughing index low, seroprevalence high) where the mean coughing index was 0.9 and seroprevalence 86.3%. Case herds and control II herds had an increased age of piglets at weaning compared to control I herds. Any contact between fattening pigs of different age during restocking of compartments increased the risk for the occurrence of EP in a herd. Finally, farms that use living animals for the exposure to gilts during the acclimatization and farms that had increased number of weaned piglets per sow and year were less likely to test positive for M. hyopneumoniae and less likely to develop clinical symptoms of EP in fattening pigs.

Citation

Nathues, H., Chang, Y. M., Wieland, B., Rechter, G., Spergser, J., Rosengarten, R., …Beilage, E. G. (2014). Herd-Level Risk Factors for the Seropositivity to Mycoplasma hyopneumoniae and the Occurrence of Enzootic Pneumonia Among Fattening Pigs in Areas of Endemic Infection and High Pig Density. Transboundary and Emerging Diseases, 61(4), 316-328. https://doi.org/10.1111/tbed.12033

Journal Article Type Article
Acceptance Date Dec 1, 2012
Publication Date Aug 1, 2014
Deposit Date Nov 11, 2014
Journal Transboundary and Emerging Diseases
Print ISSN 1865-1674
Electronic ISSN 1865-1682
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 61
Issue 4
Pages 316-328
DOI https://doi.org/10.1111/tbed.12033
Public URL https://rvc-repository.worktribe.com/output/1405133
Additional Information Corporate Creators : Vet Med, Vienna, Veterinary Medicine Hannover