Soropositividade para Mycoplasma hyopneumoniae em suínos abatidos em frigoríficos da região central do estado de São Paulo

Vicente, Acácia Ferreira; Catto, D.; Allendorf, Susan Dora; Garcia, K. C. O. D.; Antunes, João Marcelo Azevedo de Paula; Appolinário, Camila Michele; Peres, Marina Gea; Megid, Jane

doi:10.1590/s0102-09352013000600045

Cited by 4 publications

(2 citation statements)

References 5 publications

(4 reference statements)

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“…A total of 79.3% of the lungs were positive for M. hyopneumoniae by qPCR and four out of five companies presented a high Agents of pneumonia in slaughtered pigs in southern Brazil proportion of lungs positive for M. hyopneumoniae by PCR. This data emphasizes the importance of this bacterium in Brazilian finishing pigs, as previously reported (Takeuti et al 2013, Vicente et al 2013, Morés et al 2015, which could be related to the high density of pig farms in Brazilian pig production areas and the very high prevalence of positive farms for M. hyopneumoniae in the country. It is important to note that P. multocida type A isolation was significantly lower in samples from company C when compared to all other companies.…”

Section: Discussionsupporting

confidence: 80%

Agents of pneumonia in slaughtered pigs in southern Brazil

et al. 2021

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A high prevalence of pneumonic lesions has been reported to affect slaughtered pigs in southern Brazil. In order to identify which microorganisms have been causing those lesions, 30 pig lungs presenting pneumonic gross lesions were collected from five different slaughterhouses, totaling 150 lungs. Samples for bacterial isolation, molecular, histopathologic and immunohistochemistry (IHC) evaluation were taken from each lung. The pneumonic lesion scoring ranged from 1.53 to 2.83. The most frequent histopathological lesions found was the concomitant Influenza A virus (IAV) and Mycoplasma hyopneumoniae infection, corresponding to 55.3% (83/150), and Pasteurella multocida type A was isolated in 54.2% (45/83) of these cases. In 102 samples (68%), there was histopathologic suggestion of involvement of more than one infectious agent. M. hyopneumoniae was the most frequent agent associated with pneumonic lesions, being present in 92.1% (94/102) of the lungs with coinfections, followed by IAV in 89.2% (91/102). Besides the coinfections, IAV lesions were observed also in six samples without another pathogenic microorganism detected. A total of 46 samples with acute and subacute IAV suspected lesions in histopathological examination were assessed for IHC and real time RT-PCR for IAV. A total of 35% (16/46) of them were positive by IHC and 13% (6/46) by real time RT-PCR. Regarding M. hyopneumoniae, 79.3% (119/150) of samples were positive by qPCR and 84.9% (101/119) of them also presented M. hyopneumoniae suspected lesions in the histopathological examination. The results of this study suggest the importance of IAV in respiratory diseases in finishing pigs, even though this virus is more frequently reported in the nursery phase. In addition, our results emphasize the importance of lung coinfections in finishing pigs.

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Section: Discussionsupporting

confidence: 80%

Agents of pneumonia in slaughtered pigs in southern Brazil

et al. 2021

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“…According to Vicente et al (2013), 52% of samples collected from different farms in a central region of São Paulo state were seropositive for M. hyopneumoniae. Silva et al (2009) also detected this agent in 52.6% of lung samples collected from southeast Brazil.…”

Section: Resultsmentioning

confidence: 99%

Occurrence of Mycoplasma hyopneumoniae in slaughter pigs from Southern Brazil

Pacce¹,

Oliveira²,

Jorge³

et al. 2019

Braz. J. Vet. Res. Anim. Sci.

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Mycoplasma hyopneumoniae is the causative agent of enzootic pneumonia (EP), a disease that is highly prevalent and globally distributed, causing significant economic losses to the swine industry. Disease progression is characterized by reduced feed conversion and the development of lung lesions. Considering the limited information about the epidemiology of EP in Southern Brazil, the main objective of this study was to determine the occurrence of M. hyopneumoniae in swine lung samples and to evaluate the scores of lung lesions caused by local strains. A total of 120 samples was randomly collected and processed. DNA was extracted from lung tissue to perform nested-PCR and lungs were inspected to evaluate the presence of the pneumonia-like gross lesions of M. hyopneumoniae. The results showed 95.8% positive samples, while the lung lesion score analysis showed suggestive lesions in 60% of samples. The detection of positive samples in nested-PCR was associated with the presence of pneumonia-like gross lesions (P < 0.01). The results demonstrate a high occurrence of EP in slaughter pigs from southern Brazil.

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Antibodies against Actinobacillus pleuropneumoniae, Mycoplasma hyopneumoniae and influenza virus and their relationships with risk factors, clinical signs and lung lesions in pig farms with one-site production systems in Brazil

Baraldi

Cruz

Pereira

et al. 2019

Preventive Veterinary Medicine

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A study was conducted on 21 pig herds using one-site production system in the southeast region of Brazil to assess the relationships among serological results for primary pathogens involved in respiratory diseases (Actinobacillus pleuropneumoniae, App; Mycoplasma hyopneumoniae, Mhyo; and swine influenza virus, SIV), cough index, pneumonia index, pleuritis and herd characteristics. The prevalence of antibodies against Mhyo and SIV increased throughout the raising phases, with the highest prevalence in slaughtered pigs (> 40%), while pigs in 65% (14/21) of nurseries demonstrated marked seroprevalence of App that decreased until the day of slaughter. Pleuritis and pulmonary consolidations were recorded in 9.0 and 72.4%, respectively, of the 908 evaluated lungs. Histopathological analysis of the lung lesions revealed suppurative bronchopneumonia in almost half of the lungs (48.9%). Regression analyses were conducted to identify risk factors associated with the cough index; pleuritis; pulmonary consolidation; and App, Mhyo and SIV serological results. All-in-all-out management in nursery buildings reduced the seroprevalence of Mhyo in herds. App seroprevalence was associated with pleuritis, and the presence of cough episodes in growing pigs was associated with SIV seropositivity in nursery pigs.

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Soropositividade para Mycoplasma hyopneumoniae em suínos abatidos em frigoríficos da região central do estado de São Paulo

Cited by 4 publications

References 5 publications

Agents of pneumonia in slaughtered pigs in southern Brazil

Agents of pneumonia in slaughtered pigs in southern Brazil

Occurrence of Mycoplasma hyopneumoniae in slaughter pigs from Southern Brazil

Antibodies against Actinobacillus pleuropneumoniae, Mycoplasma hyopneumoniae and influenza virus and their relationships with risk factors, clinical signs and lung lesions in pig farms with one-site production systems in Brazil

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