scholarly journals Aspectos patológicos e microbiológicos das doenças respiratórias em suínos de terminação no Brasil

2015 ◽  
Vol 35 (8) ◽  
pp. 725-733 ◽  
Author(s):  
Marcos A.Z. Morés ◽  
João X. Oliveira Filho ◽  
Raquel Rebelatto ◽  
Cátia S. Klein ◽  
David E.N. Barcellos ◽  
...  
Keyword(s):  
Influenza A ◽  
Pasteurella Multocida ◽  
Mycoplasma Hyopneumoniae ◽  
Mycoplasma Hyorhinis

Resumo: Para avaliação dos aspectos patológicos e microbiológicos de casos clínicos de doenças respiratórias em suínos de terminação foram analisados 75 suínos doentes oriundos de 36 lotes. Suínos que apresentavam sinais clínicos respiratórios evidentes foram necropsiados para avaliação macroscópica e colheita de amostras para análise histopatológica e microbiológica. Foram realizados testes de isolamento bacteriano para as principais bactérias do sistema respiratório dos suínos, PCR para Mycoplasma hyorhinis, imuno-histoquímica para Influenza A, Circovirus suíno tipo 2 e Mycoplasma hyopneumoniae. A sensibilidade antimicrobiana de 24 amostras de Pasteurella multocida tipo A foi avaliada por testes de concentração inibitória mínima para os principais antimicrobianos utilizados em suinocultura. Mycoplasma hyopneumoniae e Pasteurella multocida tipo A foram os agentes infecciosos mais prevalentes. Broncopneumonia supurativa e pleurite foram as principais lesões respiratórias encontradas. Pasteurella multocida tipo A, quando presente, aumentou a extensão das lesões pulmonares. Todas as amostras de Pasteurella multocida testadas foram sensíveis aos antimicrobianos Doxiciclina, Enrofloxacina e Tilmicosina. Em 58% das amostras foi identificado mais de um agente infeccioso, evidenciando a alta prevalência da associação de agentes nas doenças respiratórias de suínos em terminação.

Lungworms (Metastrongylus Spp.) Demonstrated in Domestic Pigs with Respiratory Disease - What was the True Relevance of that?

2021 ◽  
Author(s):  
Per Wallgren ◽  
Emelie Pettersson
Keyword(s):  
Respiratory Disease ◽  
Pasteurella Multocida ◽  
Ascaris Suum ◽  
Clinical Signs ◽  
Mycoplasma Hyopneumoniae ◽  
Disease Outbreak ◽  
Domestic Pigs ◽  
Faecal Samples ◽  
Routine Inspection ◽  
The Impact

Abstract BackgroundAn outdoor pig herd was affected by severe respiratory disease in one out of three pastures. At necropsy, Mycoplasma hyopneumoniae and Pasteurella multocida were detected in the lungs, as well as the lung worm Metastrongylus apri. The life cycle of Metastrongylus spp. includes earth worms as an intermediate host, and since domesticated pigs mainly are reared indoors lungworms has not been diagnosed in domestic pigs in Sweden for decades, not even in pigs reared outdoors. Therefore, this disease outbreak was scrutinised from the view of validating the impact of Metastrongylus spp..ResultsAt the time of the disease outbreak, neither eggs of Metastrongylus spp. nor Ascaris suum were detected in faeces of pigs aged ten weeks. In contrast, five-months-old pigs at the pasture with respiratory disease shed large amounts of eggs from Ascaris suum, whereas Ascaris suum not was demonstrated in healthy pigs aged six months at another pasture. Low numbers of eggs from Metastrongylus spp. were seen in faecal samples from both these age categories.At slaughter, seven weeks later, ten normal weighted pigs in the preceding healthy batch were compared with ten normal weighted and five small pigs from the affected batch. Healing Mycoplasma-like pneumonic lesions were seen in all groups. Small pigs had more white spot liver lesions, and all small pigs shed eggs of Ascaris suum in faeces, compared to around 50% of the pigs in the normally sized groups. Metastrongylus spp. were demonstrated in 13 of the 25 pigs (52%), %), representing all groups included.ConclusionAs Metastrongylus spp. were demonstrated regardless of health status, and in another healthy outdoor herd, the impact of Metastrongylus spp. on the outbreak of respiratory disease was depreciated. Instead, Metastrongylus spp. was suggested to be common in outdoor production, although rarely diagnosed. The reason for this is because they will escape detection at routine inspection at slaughterhouses, and that they appeared to generally not induce clinical signs of respiratory disease. Instead, a possible association with a high burden of Ascaris suum was suggested to have preceded the severe outbreak with respiratory disease.

scholarly journals Causes of death in growing-finishing pigs in two technified farms in southern Brazil

2020 ◽  
Vol 40 (10) ◽  
pp. 758-775
Author(s):  
Manoela M. Piva ◽  
Claiton I. Schwertz ◽  
Ronaldo M. Bianchi ◽  
Regina T. Kemper ◽  
Luan Cleber Henker ◽  
...  
Keyword(s):  
Infectious Diseases ◽  
Influenza A ◽  
Pasteurella Multocida ◽  
Causes Of Death ◽  
Histopathological Examination ◽  
Gastric Ulcers ◽  
Finishing Pigs ◽  
Southern Brazil ◽  
Bacterial Pericarditis ◽  
Conclusive Diagnosis

ABSTRACT: The aim of this study was to investigate the main causes of death in growing-finishing pigs in southern Brazil. During a one-year period (from 2018 to 2019), two industrial pig herds (18 and 20 thousand pigs each farm) in southern Brazil were monitored along the four seasons of the year (12 days per season on each farm), in order to perform necropsies of all pigs that died in that period. The two farms had an average monthly mortality rate ranging from 0.94 to 3.93% in the evaluated months. At necropsy, tissues were collected, fixed in 10% formalin solution and processed routinely for histopathological examination. When necessary, samples were sent for bacterial culture and PCR to identify etiologic agents. A total of 601 necropsies were performed, with 94.9% of conclusive diagnoses. Infectious diseases corresponded to 64.4% of conclusive diagnosis and non-infectious diseases to 35.6%. The most prevalent causes of death were: pneumonia (33%), gastric ulcers (15.4%), circovirosis (9.9%), systemic bacterial embolism (5.4%), polyserositis (4.4%), dilated cardiomyopathy and torsion of abdominal organs (4.3% each), and bacterial pericarditis (3.4%). Regarding pneumonias (199/601), the main agents identified in these cases were Pasteurella multocida, Influenza A virus and Mycoplasma hyopneumoniae, mainly in associations.

scholarly journals Diagnostics of main bacterial agents of porcine respiratory diseases complex (PRDC) using PCR detection of Mycoplasma hyopneumoniae

2012 ◽  
Vol 49 (No. 2) ◽  
pp. 35-41 ◽  
Author(s):  
I. Holko ◽  
J. Urbanova ◽  
THolkova ◽  
V. Kmet
Keyword(s):  
Respiratory Diseases ◽  
Pasteurella Multocida ◽  
Respiratory Infections ◽  
Clinical Signs ◽  
Antibiotic Sensitivity ◽  
Mycoplasma Hyopneumoniae ◽  
Sensitivity Testing ◽  
Pcr Method ◽  
One Year ◽  
Porcine Respiratory

The main goal of our work is the presentation and analysis of incidence of porcine respiratory disease complex (PRDC) regarding bacterial agents in the territory of northern districts of Slovakia. Mycoplasma hyopneumoniae and other secondary bacterial causative pathogens of PRDC comprised 75.2% of all cases (98) with clinical signs of respiratory infections that we examined in the course of one year. We present also one of possibilities to the solution of problematic detection of M. hyopneumoniae which is, like the whole rank of mycoplasmas, very difficult to cultivate. This problem was solved by using the PCR method with the direct isolation of M. hyopneumoniae from lungs tissue. In antibiotic sensitivity testing of Pasteurella multocida and Actinobacillus pleuropneumoniae resulted enrofloxacin as the most effective antibiotics in the therapy of PRDC regarding bacterial agents.in above mentioned territory.

scholarly journals Evaluation of the clinical efficacy of a water soluble formulation of tylvalosin in the control of enzootic pneumonia associated with Mycoplasma hyopneumoniae and Pasteurella multocida in pigs

2020 ◽  
Vol 6 (1) ◽  
Author(s):  
Alfonso Lopez Rodriguez ◽  
Anna Catharina Berge ◽  
Cliff Ramage ◽  
Ryan Saltzman ◽  
Rickie J. Domangue ◽  
...  
Keyword(s):  
Drinking Water ◽  
Pasteurella Multocida ◽  
Natural Infection ◽  
Mycoplasma Hyopneumoniae ◽  
Lung Lesion ◽  
Water Soluble ◽  
Enzootic Pneumonia ◽  
Challenge Study ◽  
Lower Lung ◽  
Clinical Cases

Abstract Background The efficacy of a water soluble formulation of tylvalosin (Aivlosin® 625 mg/g granules) was evaluated in the treatment and metaphylaxis of Enzootic Pneumonia (EP) in pigs. In all four trials, pigs in the tylvalosin group were administered 10 mg tylvalosin/kg bodyweight in drinking water daily for 5 consecutive days (TVN). In a single-challenge study, pigs were inoculated with lung homogenate containing Mycoplasma hyopneumoniae. In a dual challenge study, pigs were sequentially inoculated with pure culture of M. hyopneumoniae and Pasteurella multocida. Efficacy was evaluated based on reduction of lung lesions compared to unmedicated control pigs (CTL). In two field studies at European commercial farms with confirmed outbreaks of EP, treatment efficacy in clinically affected fatteners was evaluated based on improved clinical conditions compared to pigs treated with tylosin at 10 mg/kg by injection for 3 consecutive days (TYL). In these field trials, healthy in contact pigs were enrolled for metaphylaxis efficacy evaluation based on reduction in incidence of new clinical cases of respiratory disease compared to unmedicated pigs (CTL). Results In the M. hyopneumoniae-only challenge study, pigs in TVN group had lower lung lesion scores than CTL (6.52 vs. 14.97; p <  0.001). In the dual challenge study with M. hyopneumoniae and P. multocida, pigs in TVN group had lower lung lesion scores than CTL (3.32 vs. 8.37; p <  0.01) and the recovery of both challenge bacteria from the lungs was lower in TVN compared with CTL group (p <  0.01). In field outbreaks of EP, multicentre analysis showed that 13 days after the start of medication, treatment success for TVN pigs was significantly better than for TYL pigs (80.0% vs 48.7% p = 0.03) and metaphylactic administration of TVN significantly reduced the incidence of new clinical cases (2.1% vs. 7.8%; p <  0.01) compared with unmedicated controls. Conclusions Tylvalosin at 10 mg/kg daily for 5 days in drinking water was safe and effective in the treatment and metaphylaxis of EP in pigs associated with infections of M. hyopneumoniae either alone or in combination with P. multocida under both experimental challenge and field natural infection conditions.

scholarly journals Causes of swine polyserositis in a high-density breeding area in Italy

2020 ◽  
Vol 32 (4) ◽  
pp. 594-597
Author(s):  
Cristian Salogni ◽  
Massimiliano Lazzaro ◽  
Stefano Giovannini ◽  
Nicoletta Vitale ◽  
Maria Beatrice Boniotti ◽  
...  
Keyword(s):  
Influenza A ◽  
Pasteurella Multocida ◽  
Swine Influenza ◽  
High Density ◽  
Porcine Circovirus ◽  
Respiratory Syndrome Virus ◽  
Strong Positive Correlation ◽  
Breeding Area ◽  
Causative Agents ◽  
Bacterial Coinfection

We assessed the causes of polyserositis in pigs, categorized by causative agents and ages of animals affected. In a 3-y study, 246 pigs from 80 different farms with recurrent problems of polyserositis, in a high-density breeding area, were submitted for autopsy; 154 pigs with typical fibrinous serosal lesions were sampled for further bacterial and viral investigation. The most common gross lesions were pleuritis and pericarditis (141 of 154; 92%). The animals most affected were weaned pigs (139 of 154; 90%). Haemophilus parasuis and Mycoplasma hyorhinis were the most common bacteria detected and were present at the same rate (85 of 154; 55%). Other bacteria isolated were Streptococcus sp. (44 of 154; 29%), Pasteurella multocida (21 of 154; 14%), Escherichia coli (19 of 154; 12%), Actinobacillus pleuropneumoniae (7 of 154; 5%), and Trueperella pyogenes (4 of 154; 3%). Porcine reproductive and respiratory syndrome virus (PRRSV; 119 of 154; 77%) predominated among the viruses detected, followed, with lesser prevalence, by porcine circovirus 2 (40 of 154; 26%) and swine influenza A virus (19 of 154; 12%). Bacterial coinfection and coinfection of bacteria and viruses were common (128 of 154; 83%). A strong positive correlation was found between coinfection by H. parasuis and M. hyorhinis and also by H. parasuis with PRRSV.

Evaluation of growth and gene expression of Mycoplasma hyopneumoniae and Mycoplasma hyorhinis in defined medium

2018 ◽  
Vol 45 (6) ◽  
pp. 2469-2479 ◽  
Author(s):  
Laura Scherer Beier ◽  
Franciele Maboni Siqueira ◽  
Irene Silveira Schrank
Keyword(s):  
Gene Expression ◽  
Mycoplasma Hyopneumoniae ◽  
Defined Medium ◽  
Mycoplasma Hyorhinis
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