Vaccination against swine enzootic pneumonia in field conditions: effect on clinical, pathological, zootechnical and economic parameters

Pallarés, F. J.; Gómez, S.; Ramis, G.; Seva, Juan; Muñoz, Antonio

doi:10.1051/vetres:2000141

Cited by 15 publications

(6 citation statements)

References 5 publications

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“…Despite the reported efficacy of M. hyopneumoniae vaccines in reducing lung lesions [28] and bacterial load from the respiratory tract [29], they are not capable of fully eliminate the bacteria from the animal, giving them the opportunity to cause typical MLL in a variable percentage of pigs at abattoir in different countries [12,17,19,20].…”

Section: Discussionmentioning

confidence: 99%

Prevalence of mycoplasma-like lung lesions in pigs from commercial farms from Spain and Portugal

Pallarés

Añón²,

Rodríguez-Gómez

et al. 2021

Porc Health Manag

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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.

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Section: Discussionmentioning

confidence: 99%

Prevalence of mycoplasma-like lung lesions in pigs from commercial farms from Spain and Portugal

Pallarés

Añón²,

Rodríguez-Gómez

et al. 2021

Porc Health Manag

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show abstract

“…Despite the e cacy of M. hyopneumoniae vaccines in reducing lung lesions [26] and bacterial load from the respiratory tract [27], they are not capable to fully eliminate the bacteria from the animal giving rise to typical MLL in a variable percentage of pigs at abattoir in different countries [10,14,16,17]. To corroborate the usefulness of a mycoplasma-like scoring system to be adapted to abattoirs with a high number of slaughtered pigs per hour we investigated the prevalence of mycoplasma lung lesions in Spain and Portugal in a study with an elevated number of pigs (199,678) involving a high number of farms (221).…”

Section: Discussionmentioning

confidence: 99%

Prevalence of Mycoplasma-like Lung Lesions in Pigs From Commercial Farms From Spain and Portugal

Pallarés

Añón²,

Rodríguez-Gómez³

et al. 2020

Preprint

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Background: Mycoplasma hyopneumoniae causes a chronic respiratory disease that produces important economic losses due to poor productive performance, increased mortality and increased costs due to treatment and control. The prevalence of mycoplasma-like lesions (MLL) at abattoir has been widely studied in different countries and different scoring systems have been used. However, most of them are difficult to apply in case of 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 validate a mycoplasma-like scoring system at abattoirs with a high number of pigs per hour in Spain and Portugal using the histopathological diagnosis as confirmatory method to identify pattern of pneumonia correlated to gross lesion. Results: Cranioventral pulmonary consolidation (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 calculated for all lungs examined at abattoir was 1.99 out of 5 points. The histopathological study revealed that the 78.17 % of the lungs with MLL randomly selected 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. The average loss of ADWG calculated for all pigs included in the study according the extension of the lung lesions was 22.33 g/day.Conclusions: The prevalence of MLL at abattoir was 30.97% but the microscopic examination of a sample of randomly selected lungs indicated that the real prevalence of lungs with lesions compatible with M. hyopneumoniae infection would be reduced to 24.21 %. The average score of MLL using a 0 to 5 points was 1.99 and the average loss of ADWG associated to those lesions was 22.33 g/day. The result of our study supports the importance of M. hyopneumoniae as primary pathogen in cases of PRDC.

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“…The efficacy of one or two doses of Mh vaccination varies depending on the commercial vaccine product, schedule, farm type and the study design used (Andreasen et al, 2001;Dawson et al, 2002;Kyriakis et al, 2001;Pallares et al, 2000;Ruiz et al, 2002). Most of published field studies have measured the effect of vaccination against Mh on lung lesion reduction and improvement of production parameters, but few of them have addressed Mh infection dynamics (Baccaro et al, 2005;Martelli et al, 2006;Ruiz et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Chronological study of Mycoplasma hyopneumoniae infection, seroconversion and associated lung lesions in vaccinated and non-vaccinated pigs

Sibila

Nofrarías

López-Soria

et al. 2007

Veterinary Microbiology

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Vaccination against swine enzootic pneumonia in field conditions: effect on clinical, pathological, zootechnical and economic parameters

Cited by 15 publications

References 5 publications

Prevalence of mycoplasma-like lung lesions in pigs from commercial farms from Spain and Portugal

Prevalence of mycoplasma-like lung lesions in pigs from commercial farms from Spain and Portugal

Prevalence of Mycoplasma-like Lung Lesions in Pigs From Commercial Farms From Spain and Portugal

Chronological study of Mycoplasma hyopneumoniae infection, seroconversion and associated lung lesions in vaccinated and non-vaccinated pigs

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