Occurrence of Mycoplasma hyopneumoniae in slaughter pigs from Southern Brazil

Pacce, Violetta Dias; Oliveira, Natasha Rodrigues de; Jorge, Sérgio; Dellagostin, Odir A.

doi:10.11606/issn.1678-4456.bjvras.2019.150072

Cited by 2 publications

(2 citation statements)

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“…An average M. hyopneumoniae prevalence of 30-80% has been reported in domestic pig herds worldwide [28]. In South America, the estimated M. hyopneumoniae prevalence was 48% for pigs in the Mendoza province, Argentina, based on molecular diagnosis [29], and prevalence varying from 52% (based on serology of non-vaccinated animals) to more than 90% (based on molecular diagnosis of slaughtered animals) was reported for Southeastern and Southern Brazil [30,31]. A lower M. hyopneumoniae prevalence, near 10%, was reported for pigs in Africa (Uganda) [32].…”

Section: Epidemiologymentioning

confidence: 99%

Pathogenicity & virulence of Mycoplasma hyopneumoniae

et al. 2020

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Section: Epidemiologymentioning

confidence: 99%

Pathogenicity & virulence of Mycoplasma hyopneumoniae

et al. 2020

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“…Respiratory diseases represent one of the major health problems in pig production due to mortality, decreased daily weight gain and costs with vaccination or antibiotic treatment [6,27]. Pneumonia in domestic pigs is frequently associated with Mycoplasma (M.) hyopneumoniae, which is the most important respiratory pathogen in Brazilian pig herds [25,30]. However, Actinobacillus (A.)…”

Section: Introductionmentioning

confidence: 99%

Bacterial Pneumonia in Captive Wild Boars in Southern Brazil - Etiological and Pathological Causes

Biondo¹,

Takeuti²,

Montes³

et al. 2021

Acta Scientiae. Vet.

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Background: Respiratory diseases are one of the major health issues described in intensive pig production, causing important economic losses. However, there is little information on the prevalence, etiology and clinical-pathological presentation of these diseases in wild boars. For this reason, this work investigated the presence in captive wild boars of pneumonic lesions and bacterial pathogens commonly detected and associated with respiratory diseases in domestic pigs.Materials, Methods & Results: A total of 226 captive wild boar lungs from two farms were examined in a slaughterhouse in Southern Brazil. The pneumonic lesions were classified as cranioventral, dorsocaudal, and disseminated, and the quantification of lesions was calculated. From the total of 226 lungs, 121 were collected for laboratory examination. Lungs with macroscopic lesions suggestive of pneumonia were collected for histological, bacteriological and molecular analysis. The molecular analysis was performed to detect the presence of Actinobacillus (A.) pleuropneumoniae, Glaesserella (G.) parasuis, Mycoplasma (M.) hyopneumoniae, Mycoplasma (M.) hyorhinis and Streptococcus (S.) suis serotype 2. The percentages of histological lesions and bacterial agents and their association were calculated. Cranioventral consolidation (75.2%) was the most prevalent macroscopic lung lesion, followed by disseminated (21.5%) and dorsocaudal (3.3%) distribution. Microscopically, chronic lesions were the most prevalent, representing 70.2% of the lungs. Moreover, BALT hyperplasia was present in 86.5% of the lungs, suppurative bronchopneumonia in 65.7%, and alveoli infiltrate in 46.8%. Six bacterial pathogens commonly described as agents of pig pneumonia were identified by bacterial or molecular methods: Pasteurella (P.) multocida, S. suis, M. hyopneumoniae, A. pleuropneumoniae, G. parasuis and M. hyorhinis. Twenty-eight different combinations of pathogens were identified in 84 samples (69.4%). The most common combinations were: M. hyopneumoniae and A. pleuropneumoniae (13.1%), M. hyopneumoniae, G. parasuis and M. hyorhinis (10.7%), and M. hyopneumoniae, A. pleuropneumoniae and G. parasuis (8.3%). Additionally, M. hyopneumoniae was the most frequent pathogen detected in this study, representing 58.7% of the samples. The detection of M. hyopneumoniae and M. hyorhinis by PCR was associated with the presence of BALT hyperplasia (P < 0.05) and there was also an association between the detection of M. hyopneumoniae by PCR and suppurative bronchopneumonia (P < 0.05). In addition, a significant association (P < 0.05) between the detection of M. hyopneumoniae and A. pleuropneumoniae by PCR and the histological classification (acute, subacute or chronic lesions) was observed.Discussion: The results of this study were similar to those observed in slaughtered domestic pigs, although, the detection of opportunist pathogens was less frequent than that usually described in pig pneumonia. The high prevalence of pneumonia in captive wild boars at slaughter and the similar characteristics of pneumonia in captive wild boars and domestic pigs suggest that the close phylogenetic relationship between pigs and wild boars could influence the susceptibility of both species to the colonization of the same pathogens, indicating that captive wild boars raised in confined conditions could be predisposed to respiratory diseases, similar to domestic pigs. Keywords: Mycoplasma hyopneumoniae, lung consolidation, slaughter, Sus scrofa, swine.

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Occurrence of Mycoplasma hyopneumoniae in slaughter pigs from Southern Brazil

Cited by 2 publications

References 15 publications

Pathogenicity & virulence of Mycoplasma hyopneumoniae

Pathogenicity & virulence of Mycoplasma hyopneumoniae

Bacterial Pneumonia in Captive Wild Boars in Southern Brazil - Etiological and Pathological Causes

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