Prevalence of Mycoplasma-like Lung Lesions in Pigs From Commercial Farms From Spain and Portugal
| Autor: | F.J. Pallarés, Jose María Sánchez-Carvajal, R Fabré, JA Añón, Librado Carrasco, Irene M. Rodríguez-Gómez, Inés Ruedas-Torres, Jaime Gómez-Laguna |
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| Rok vydání: | 2020 |
| Předmět: |
Scoring system
Pathology medicine.medical_specialty Lung lesions 040301 veterinary sciences Histopathology medicine.disease_cause 0403 veterinary science 03 medical and health sciences Pulmonary consolidation Mycoplasma hyopneumoniae Prevalence medicine Small Animals lcsh:SF1-1100 030304 developmental biology 0303 health sciences lcsh:Veterinary medicine Lung biology business.industry Research Respiratory disease 04 agricultural and veterinary sciences Mycoplasma medicine.disease biology.organism_classification Pneumonia medicine.anatomical_structure Pleurisy lcsh:SF600-1100 Animal Science and Zoology lcsh:Animal culture medicine.symptom business |
| Zdroj: | Porcine Health Management, Vol 7, Iss 1, Pp 1-8 (2021) Porcine Health Management |
| DOI: | 10.21203/rs.3.rs-135831/v1 |
| Popis: | Background Mycoplasma hyopneumoniae causes a chronic respiratory disease that produces important economic losses due to poor productive performance, increased mortality and costs for several control strategies. The prevalence of mycoplasma-like lesions (MLL) at abattoir has been widely studied in different countries, making use of different scoring systems. However, most of them are difficult to apply in abattoirs with high number of pigs sacrificed per hour. For that reason, it is necessary to adapt the scoring system to the reality of the modern abattoir, even if there is a loss of accuracy. Our purpose was to investigate the prevalence and severity of MLL at abattoirs in Spain and Portugal using a 0 to 5 scoring system adapted to abattoirs with high number of sacrificed pigs per hour and to highlight the histopathological diagnosis as confirmatory method to identify patterns of pneumonia correlated to gross lesions. Results Cranioventral pulmonary consolidation, a typical MLL, was the most frequent lung lesion (30.97 %) detected at the abattoir, followed by dorsocaudal infarcts with pleurisy (12.51 %) and pleurisy alone (6.26 %). The average score for all examined lungs at abattoir was 1.99 out of 5 points. The histopathological study revealed that the 78.17 % of the randomly selected lungs with MLL presented microscopic lesions compatible with M. hyopneumoniae infection. Most bronchointerstitial and interstitial pneumonia lesions had a chronic course while most suppurative and fibrinous bronchopneumonia lesions had an acute course and a higher degree of severity. The combination of microscopic lesions more frequently observed was bronchointerstitial pneumonia + interstitial pneumonia + suppurative bronchopneumonia. Conclusions The prevalence of MLL at abattoir was 30.97 %, however, after microscopic examination the real prevalence of lungs with lesions compatible with M. hyopneumoniae infection was reduced up to 24.21 %. The six more prevalent combinations of lesions in the microscopic study involved the 66.13 % of examined lungs, and in all of them, microscopic lesions characteristic of M. hyopneumoniae infection were found, what supports the importance of M. hyopneumoniae as a primary pathogen in cases of PRDC. |
| Databáze: | OpenAIRE |
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