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Turni C, Meers J, Parke K, Singh R, Yee S, Templeton J, Mone NK, Blackall PJ, Barnes TS. Pathogens associated with pleuritic pig lungs at an abattoir in Queensland Australia. Aust Vet J 2021; 99:163-171. [PMID: 33751558 DOI: 10.1111/avj.13058] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Revised: 12/21/2020] [Accepted: 01/10/2021] [Indexed: 12/19/2022]
Abstract
OBJECTIVE Pleurisy in pigs has economic impacts in the production stage and at slaughter. This study sought to establish if some micro-organisms can be found in high numbers in lungs with pleurisy by assessing batches of pigs at an abattoir in Queensland Australia. DESIGN Samples of lung (including trachea/bronchus and lymph nodes) from a maximum of 5 pleurisy affected pigs were collected from 46 batches of pigs representing 46 Queensland farms. PROCEDURE Pleurisy-affected lung areas were cultured by traditional bacteriological methods and bacteria quantified by plate scores. Additionally, tracheal or bronchial swabs and apical lobe fluid were tested for Mycoplasma hyopneumoniae DNA and the superior tracheobronchial lymph nodes were tested for porcine circovirus type 2 DNA by polymerase chain reaction (PCR). All apparently significant bacteria were identified via PCR or sequencing. Typing was undertaken on some of the bacterial isolates. RESULTS The most prevalent pathogens were M. hyopneumoniae, Streptococcus suis and Porcine Circovirus type 2, being found in 34, 38 and 31 batches, respectively. Other bacteria found were Actinobacillus species (29 batches), Pasteurella multocida (24 batches), Mycoplasma flocculare (9 batches), Actinobacillus pleuropneumoniae (7 batches), Mycoplasma hyorhinis (4 batches), Bisgaard Taxon 10 (1 batch), Glaesserella parasuis (1 batch), Streptococcus minor (1 batch) and Streptococcus porcinus (1 batch). Most batches had more than one bacterial species. CONCLUSION The high percentage of batches infected with S. suis (83%), M. hyopneumoniae (74%) and PCV2 (70%) and clustering by a batch of these pathogens, as well as the presence of many secondary pathogens, suggests synergy between these organisms may have resulted in pleurisy.
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Affiliation(s)
- C Turni
- Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, EcoSciences Precinct, Dutton Park, Queensland, 4102, Australia
| | - J Meers
- School of Veterinary Science, The University of Queensland, Gatton, Queensland, 4343, Australia
| | - K Parke
- School of Veterinary Science, The University of Queensland, Gatton, Queensland, 4343, Australia
| | - R Singh
- Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, EcoSciences Precinct, Dutton Park, Queensland, 4102, Australia
| | - S Yee
- Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, EcoSciences Precinct, Dutton Park, Queensland, 4102, Australia
| | - J Templeton
- Department of Agriculture and Fisheries, Ecosciences Precinct, Dutton Park, Queensland, 4102, Australia
| | - N K Mone
- School of Veterinary Science, The University of Queensland, Gatton, Queensland, 4343, Australia
| | - P J Blackall
- Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, EcoSciences Precinct, Dutton Park, Queensland, 4102, Australia
| | - T S Barnes
- Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, EcoSciences Precinct, Dutton Park, Queensland, 4102, Australia.,School of Veterinary Science, The University of Queensland, Gatton, Queensland, 4343, Australia
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Draft Genome Sequences of the Type Strains of Actinobacillus indolicus (46K2C) and Actinobacillus porcinus (NM319), Two NAD-Dependent Bacterial Species Found in the Respiratory Tract of Pigs. Microbiol Resour Announc 2020; 9:9/1/e00716-19. [PMID: 31896621 PMCID: PMC6940273 DOI: 10.1128/mra.00716-19] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
We report here the draft genome sequences of the type strains of Actinobacillus indolicus (46K2C) and Actinobacillus porcinus (NM319). These NAD-dependent bacterial species are frequently found in the upper respiratory tract of pigs and are occasionally associated with lung pathology. We report here the draft genome sequences of the type strains of Actinobacillus indolicus (46K2C) and Actinobacillus porcinus (NM319). These NAD-dependent bacterial species are frequently found in the upper respiratory tract of pigs and are occasionally associated with lung pathology.
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Comparative Genomics of the First and Complete Genome of " Actinobacillus porcitonsillarum" Supports the Novel Species Hypothesis. Int J Genomics 2018; 2018:5261719. [PMID: 30363939 PMCID: PMC6186353 DOI: 10.1155/2018/5261719] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2018] [Accepted: 08/12/2018] [Indexed: 11/25/2022] Open
Abstract
“Actinobacillus porcitonsillarum” is considered a nonpathogenic member of the Pasteurellaceae family, which phenotypically resembles the pathogen Actinobacillus pleuropneumoniae. Previous studies suggested that “A. porcitonsillarum” may represent a new species closely related to Actinobacillus minor, yet no full genome has been sequenced so far. We implemented the Oxford Nanopore and Illumina sequencing technologies to obtain the highly accurate and complete genome sequence of the “A. porcitonsillarum” strain 9953L55. After validating our de novo assembly strategy by comparing the A. pleuropneumoniae S4074T genome sequence obtained by Oxford Nanopore Technology combined with Illumina reads with a PacBio-sequenced S4074T genome from the NCBI database, we performed comparative analyses of the 9953L55 genome with the A. minor type strain NM305T, A. minor strain 202, and A. pleuropneumoniae S4074T. The 2,263,191 bp circular genome of 9953L55 consisted of 2168 and 2033 predicted genes and proteins, respectively. The lipopolysaccharide cluster resembled the genetic organization of A. pleuropneumoniae serotypes 1, 9, and 11, possibly explaining the positive reactions observed previously in serotyping tests. In contrast to NM305T, we confirmed the presence of a complete apxIICABD operon in 9953L55 and 202 accounting for their hemolytic phenotype and Christie-Atkins-Munch-Petersen (CAMP) reaction positivity. Orthologous gene cluster analysis provided insight into the differential ability of strains of the A. minor/“porcitonsillarum” complex and A. pleuropneumoniae to ferment lactose, raffinose, trehalose, and mannitol. The four strains showed distinct and shared transposable elements, CRISPR/Cas systems, and integrated prophages. Genome comparisons based on average nucleotide identity and in silico DNA-DNA hybridization confirmed the close relationship among strains belonging to the A. minor/“porcitonsillarum” complex compared to other Actinobacillus spp., but also suggested that 9953L55 and 202 belong to the same novel species closely related to A. minor, namely, “A. porcitonsillarum.” Recognition of the taxon as a separate species would improve diagnostics and control strategies of pig pleuropneumonia.
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A Novel Glaesserella sp. Isolated from Pigs with Severe Respiratory Infections Has a Mosaic Genome with Virulence Factors Putatively Acquired by Horizontal Transfer. Appl Environ Microbiol 2018; 84:AEM.00092-18. [PMID: 29572210 DOI: 10.1128/aem.00092-18] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2018] [Accepted: 03/19/2018] [Indexed: 01/31/2023] Open
Abstract
An unknown member of the family Pasteurellaceae was repeatedly isolated from 20- to 24-week-old pigs with severe pulmonary lesions reared on the same farm in Victoria, Australia. The etiological diagnosis of the disease was inconclusive. The complete genome sequence analysis of one strain, 15-184, revealed some phylogenic proximity to Glaesserella (Haemophilus) parasuis, the cause of Glasser's disease. However, the sequences of the 16S rRNA and housekeeping genes, as well as the average nucleotide identity scores, differed from those of all other known species in the family Pasteurellaceae The protein content of 15-184 was composite, with 60% of coding sequences matching known G. parasuis products, while more than 20% had a closer relative in the genera Actinobacillus, Mannheimia, Pasteurella, and Bibersteinia Several putative virulence genes absent from G. parasuis but present in other Pasteurellaceae were also found, including the apxIII RTX toxin gene from Actinobacillus pleuropneumoniae, ABC transporters from Actinobacillus minor, and iron transporters from various species. Three prophages and one integrative conjugative element were present in the isolate. Horizontal gene transfers might explain the mosaic genomic structure and atypical metabolic and virulence characteristics of 15-184. This organism has not been assigned a taxonomic position in the family, but this study underlines the need for a large-scale epidemiological and clinical characterization of this novel pathogen in swine populations, as a genomic analysis suggests it could have a severe impact on pig health.IMPORTANCE Several species of Pasteurellaceae cause a range of significant diseases in pigs. A novel member of this family was recently isolated from Australian pigs suffering from severe respiratory infections. Comparative whole-genome analyses suggest that this bacterium represents a new species, which possesses a number of virulence genes horizontally acquired from a diverse range of other Pasteurellaceae While the possible contribution of other coinfecting noncultivable agents to the disease has not been ruled out in this study, the repertoire of virulence genes found in this organism may nevertheless explain some aspects of the associated pathology observed on the farm. The prevalence of this novel pathogen within pig populations is currently unknown. This finding is of particular importance for the pig industry, as this organism can have a serious impact on the health of these animals.
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5
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Gou H, Li J, Cai R, Song S, Li M, Yang D, Jiang Z, Li Y, Chu P, Li C. Rapid detection of Haemophilus parasuis using cross-priming amplification and vertical flow visualization. J Microbiol Methods 2017; 144:67-72. [PMID: 29128480 DOI: 10.1016/j.mimet.2017.11.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2017] [Revised: 11/04/2017] [Accepted: 11/05/2017] [Indexed: 11/17/2022]
Abstract
Haemophilus parasuis infection is of considerable economic importance in the swine industry due to high morbidity and mortality in naive swine populations. Accurate detection and identification of the causative agent are difficult, yet necessary, for disease control. In this study, a simple and rapid method of cross-priming amplification (CPA) with a vertical flow (VF) visualization strip was established to detect H. parasuis. The reaction can specifically identify 15 serovar reference strains and 57 clinically isolated strains of H. parasuis, with a detection limit of 14CFU. The performance of the CPA-VF assay was evaluated and compared with that of species-specific PCR by testing 62 clinical culture-positive specimens of H. parasuis. The entire process, from specimen processing to analysis of the results, can be completed in 2h without a complicated apparatus. The convenience and speed of the CPA-VF assay in this study make it a suitable choice for epidemiological investigation and point-of-care testing (POCT) for H. parasuis infection.
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Affiliation(s)
- Hongchao Gou
- Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Guangzhou, China; Guangdong Provincial Key Laboratory of Livestock Disease Prevention, Guangzhou, China; Guangdong Open Laboratory of Veterinary Public Health, Guangzhou, China
| | - Juan Li
- Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Guangzhou, China; Guangdong Provincial Key Laboratory of Livestock Disease Prevention, Guangzhou, China; Guangdong Open Laboratory of Veterinary Public Health, Guangzhou, China
| | - Rujian Cai
- Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Guangzhou, China; Guangdong Provincial Key Laboratory of Livestock Disease Prevention, Guangzhou, China; Guangdong Open Laboratory of Veterinary Public Health, Guangzhou, China
| | - Shuai Song
- Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Guangzhou, China; Guangdong Provincial Key Laboratory of Livestock Disease Prevention, Guangzhou, China; Guangdong Open Laboratory of Veterinary Public Health, Guangzhou, China
| | - Miao Li
- Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Guangzhou, China; Guangdong Provincial Key Laboratory of Livestock Disease Prevention, Guangzhou, China; Guangdong Open Laboratory of Veterinary Public Health, Guangzhou, China
| | - Dongxia Yang
- Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Guangzhou, China; Guangdong Provincial Key Laboratory of Livestock Disease Prevention, Guangzhou, China; Guangdong Open Laboratory of Veterinary Public Health, Guangzhou, China
| | - Zhiyong Jiang
- Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Guangzhou, China; Guangdong Provincial Key Laboratory of Livestock Disease Prevention, Guangzhou, China; Guangdong Open Laboratory of Veterinary Public Health, Guangzhou, China
| | - Yan Li
- Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Guangzhou, China; Guangdong Provincial Key Laboratory of Livestock Disease Prevention, Guangzhou, China; Guangdong Open Laboratory of Veterinary Public Health, Guangzhou, China
| | - Pinpin Chu
- Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Guangzhou, China; Guangdong Provincial Key Laboratory of Livestock Disease Prevention, Guangzhou, China; Guangdong Open Laboratory of Veterinary Public Health, Guangzhou, China
| | - Chunling Li
- Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Guangzhou, China; Guangdong Provincial Key Laboratory of Livestock Disease Prevention, Guangzhou, China; Guangdong Open Laboratory of Veterinary Public Health, Guangzhou, China.
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6
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Gu W, Chen S, Chen G, Ji Z. Enhancement of Haemophilus parasuis
serovar 5 yields by medium optimization. Lett Appl Microbiol 2015; 61:44-9. [DOI: 10.1111/lam.12421] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2014] [Revised: 03/15/2015] [Accepted: 03/16/2015] [Indexed: 11/27/2022]
Affiliation(s)
- W. Gu
- State Key Laboratory of Agricultural Microbiology; Huazhong Agricultural University; Wuhan China
- Wuhan Keqian Animal Biology Product Co. Ltd; Wuhan China
| | - S.W. Chen
- State Key Laboratory of Agricultural Microbiology; Huazhong Agricultural University; Wuhan China
| | - G.P. Chen
- Wuhan Keqian Animal Biology Product Co. Ltd; Wuhan China
| | - Z.X. Ji
- State Key Laboratory of Agricultural Microbiology; Huazhong Agricultural University; Wuhan China
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7
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Biofilm formation in Haemophilus parasuis: relationship with antibiotic resistance, serotype and genetic typing. Res Vet Sci 2014; 97:171-5. [DOI: 10.1016/j.rvsc.2014.04.014] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2013] [Revised: 03/26/2014] [Accepted: 04/29/2014] [Indexed: 11/24/2022]
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8
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Zhang L, Wen Y, Li Y, Wei X, Yan X, Wen X, Wu R, Huang X, Huang Y, Yan Q, Liu M, Cao S. Comparative proteomic analysis of the membrane proteins of two Haemophilus parasuis strains to identify proteins that may help in habitat adaptation and pathogenesis. Proteome Sci 2014; 12:38. [PMID: 25057263 PMCID: PMC4107730 DOI: 10.1186/1477-5956-12-38] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2014] [Accepted: 06/29/2014] [Indexed: 01/03/2023] Open
Abstract
Background Haemophilus parasuis is the causative agent of Glässer’s disease characterized by polyserositis, arthritis, and meningitis in pig, leading to serious economic loss. Despite many years of study, virulence factors and the mechanisms of the entire infection process remain largely unclear. So two-dimensional gel electrophoresis and mass spectrometry were used to search for distinctions at the membrane protein expression level between two H. parasuis isolates aimed at uncovering some proteins potentially involved in habitat adaption and pathogenesis. Results A comparative proteomic approach combining two-dimensional gel electrophoresis with mass spectrometry and tandem mass spectrometry was employed to explore the differences among membrane proteomes of a virulent Haemophilus parasuis strain isolated from the lung of a diseased pig and an avirulent strain isolated from the nasal swab of a healthy pig. Differentially expressed protein spots identified by mass spectrometry were annotated and analyzed by bioinformatic interpretation. The mRNA level was determined by quantitative real-time PCR. Proteins representing diverse functional activities were identified. Among them, the tonB-dependent siderophore receptor was a new discovery highlighted for its activity in iron uptake. In addition, periplasmic serine protease and putrescine/spermidine ABC transporter substrate-binding protein were given focus because of their virulence potential. This study revealed that the differentially expressed proteins were important in either the habitat adaption or pathogenesis of H. parasuis. Conclusions The outcome demonstrated the presence of some proteins which raise the speculation for their importance in helping in habitat adaption or pathogenesis within the host.
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Affiliation(s)
- Luhua Zhang
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Ya'an, Sichuan 625014, PR China
| | - Yiping Wen
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Ya'an, Sichuan 625014, PR China
| | - Ying Li
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Ya'an, Sichuan 625014, PR China
| | - Xingliang Wei
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Ya'an, Sichuan 625014, PR China
| | - Xuefeng Yan
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Ya'an, Sichuan 625014, PR China
| | - Xintian Wen
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Ya'an, Sichuan 625014, PR China
| | - Rui Wu
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Ya'an, Sichuan 625014, PR China
| | - Xiaobo Huang
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Ya'an, Sichuan 625014, PR China
| | - Yong Huang
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Ya'an, Sichuan 625014, PR China
| | - Qigui Yan
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Ya'an, Sichuan 625014, PR China
| | - Mafeng Liu
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Ya'an, Sichuan 625014, PR China
| | - Sanjie Cao
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Ya'an, Sichuan 625014, PR China
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Simultaneous detection of antibodies against Apx toxins ApxI, ApxII, ApxIII, and ApxIV in pigs with known and unknown Actinobacillus pleuropneumoniae exposure using a multiplexing liquid array platform. CLINICAL AND VACCINE IMMUNOLOGY : CVI 2013; 21:85-95. [PMID: 24226091 DOI: 10.1128/cvi.00451-13] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Surveillance for the presence of Actinobacillus pleuropneumoniae infection in a population plays a central role in controlling the disease. In this study, a 4-plex fluorescent microbead-based immunoassay (FMIA), developed for the simultaneous detection of IgG antibodies to repeat-in-toxin (RTX) toxins (ApxI, ApxII, ApxIII, and ApxIV) of A. pleuropneumoniae, was evaluated using (i) blood serum samples from pigs experimentally infected with each of the 15 known A. pleuropneumoniae serovars or with Actinobacillus suis, (ii) blood serum samples from pigs vaccinated with a bacterin containing A. pleuropneumoniae serovar 1, 3, 5, or 7, and (iii) blood serum samples from pigs with an unknown A. pleuropneumoniae exposure status. The results were compared to those obtained in a previous study where a dual-plate complement fixation test (CFT) and three commercially available enzyme-linked immunosorbent assays (ELISAs) were conducted on the same sample set. On samples from experimentally infected pigs, the 4-plex Apx FMIA detected specific seroconversion to Apx toxins as early as 7 days postinfection in a total of 29 pigs inoculated with 14 of the 15 A. pleuropneumoniae serovars. Seroconversion to ApxII and ApxIII was detected by FMIA in pigs inoculated with A. suis. The vaccinated pigs showed poor humoral responses against ApxI, ApxII, ApxIII, and ApxIV. In the field samples, the humoral response to ApxIV and the A. pleuropneumoniae seroprevalence increased with age. This novel FMIA (with a sensitivity of 82.7% and a specificity of 100% for the anti-ApxIV antibody) was found to be more sensitive and accurate than current tests (sensitivities, 9.5 to 56%; specificity, 100%) and is potentially an improved tool for the surveillance of disease and for monitoring vaccination compliance.
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10
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Gene content and diversity of the loci encoding biosynthesis of capsular polysaccharides of the 15 serovar reference strains of Haemophilus parasuis. J Bacteriol 2013; 195:4264-73. [PMID: 23873912 DOI: 10.1128/jb.00471-13] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Haemophilus parasuis is the causative agent of Glässer's disease, a systemic disease of pigs, and is also associated with pneumonia. H. parasuis can be classified into 15 different serovars. Here we report, from the 15 serotyping reference strains, the DNA sequences of the loci containing genes for the biosynthesis of the group 1 capsular polysaccharides, which are potential virulence factors of this bacterium. We contend that these loci contain genes for polysaccharide capsule structures, and not a lipopolysaccharide O antigen, supported by the fact that they contain genes such as wza, wzb, and wzc, which are associated with the export of polysaccharide capsules in the current capsule classification system. A conserved region at the 3' end of the locus, containing the wza, ptp, wzs, and iscR genes, is consistent with the characteristic export region 1 of the model group 1 capsule locus. A potential serovar-specific region (region 2) has been found by comparing the predicted coding sequences (CDSs) in all 15 loci for synteny and homology. The region is unique to each reference strain with the exception of those in serovars 5 and 12, which are identical in terms of gene content. The identification and characterization of this locus among the 15 serovars is the first step in understanding the genetic, molecular, and structural bases of serovar specificity in this poorly studied but important pathogen and opens up the possibility of developing an improved molecular serotyping system, which would greatly assist diagnosis and control of Glässer's disease.
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Frandoloso R, Martínez-Martínez S, Rodríguez-Ferri E, Gutiérrez-Martín C. Comparison of real-time PCR and culture isolation in colostrum-deprived pigs immunized and challenged with Haemophilus parasuis. Lett Appl Microbiol 2011; 54:149-52. [DOI: 10.1111/j.1472-765x.2011.03187.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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12
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Perry MB, Angen Ø, MacLean LL, Lacouture S, Kokotovic B, Gottschalk M. An atypical biotype I Actinobacillus pleuropneumoniae serotype 13 is present in North America. Vet Microbiol 2011; 156:403-10. [PMID: 22192359 DOI: 10.1016/j.vetmic.2011.11.024] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2011] [Revised: 11/20/2011] [Accepted: 11/24/2011] [Indexed: 11/24/2022]
Abstract
Atypical Actinobacillus pleuropneumoniae serotype 13 strains present in North America are described here for the first time. Different from serotype 13 strains described in Europe, North America strains are biotype I and antigenically related to both, serotypes 13 and 10. Chemical and structural analysis of the capsular polysaccharide (CPS) and lipopolysaccharide (LPS) of a representative strain revealed that the CPS is almost identical to that of the reference strain of serotype 13, having a slightly higher degree of glycose O-acetylation. However, it produces an O-PS within the LPS antigenically and structurally identical with that of the reference strain of A. pleuropneumoniae serotype 10. The O-PS was characterized as a homopolymer of 1,2 linked β-D-galactofuranosyl residues, a structure unrelated to that of the O-PS produced by the reference strain of serotype 13. Strains from Canada and United States are antigenically, phenotypically and genotypically similar. Animals infected by one of these strains induced antibodies that were detected by a LPS-based ELISA diagnostic test using either the homologous antigen or that of serotype 10. Based on the LPS and toxin profile, these strains might be misidentified as A. pleuropneumoniae serotype 10.
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Affiliation(s)
- Malcolm B Perry
- Institute for Biological Sciences, National Research Council, Ottawa, Ontario, Canada
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13
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Nathues H, Beilage EG, Kreienbrock L, Rosengarten R, Spergser J. RAPD and VNTR analyses demonstrate genotypic heterogeneity of Mycoplasma hyopneumoniae isolates from pigs housed in a region with high pig density. Vet Microbiol 2011; 152:338-45. [DOI: 10.1016/j.vetmic.2011.05.029] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2010] [Revised: 05/12/2011] [Accepted: 05/17/2011] [Indexed: 10/18/2022]
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14
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Zhang J, Xu C, Guo L, Ke B, Ke C, Zhang B, Deng X, Liao M. A rapid pulsed-field gel electrophoresis method of genotyping Haemophilus parasuis isolates. Lett Appl Microbiol 2011; 52:589-95. [DOI: 10.1111/j.1472-765x.2011.03048.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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15
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Ohba T, Shibahara T, Kobayashi H, Takashima A, Nagoshi M, Araki M, Takizawa K, Kubo M. Prevalence of granulomatous pleuropneumonia associated with Actinobacillus pleuropneumoniae serotype 2 in slaughter pigs. J Vet Med Sci 2010; 71:1089-92. [PMID: 19721364 DOI: 10.1292/jvms.71.1089] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
A total of 14,818 slaughtered pigs were examined macroscopically. Of these, 25 pigs with porcine pleuropneumonia were collected and the relations among Actinobacillus spp. and granulomatous lesions in organs (lungs and tonsils) were evaluated. In the lungs, only Actinobacillus pleuropneumoniae serotype 2 was isolated from 20 of the pigs. Histologically, granulomatous pneumonia with A. pleuropneumoniae antigen was detected in 8 of the pigs. The antigen was visible in the centers of the lesions along with asteroid bodies, epithelioid cells and multinucleated giant cells. In the tonsils, granulomatous lesions were not detected, although A. pleuropneumoniae serotype 2 (5 pigs), serotype 7 (1 pig), Actinobacillus porcitonsillarum (1 pig) and Actinobacillus minor (1 pig) were isolated. The present survey suggests that multifocal granulomatous pneumonia in slaughter pigs could be highly associated with A. pleuropneumoniae serotype 2 infection.
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Affiliation(s)
- Takemi Ohba
- Toyama Prefectural Meat Inspection Center, Imizu, Japan
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16
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Arya G, Niven DF. Production of haemolysins by strains of the Actinobacillus minor/"porcitonsillarum" complex. Vet Microbiol 2009; 141:332-41. [PMID: 19819087 DOI: 10.1016/j.vetmic.2009.09.030] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2009] [Revised: 09/18/2009] [Accepted: 09/22/2009] [Indexed: 11/29/2022]
Abstract
Actinobacillus minor and "Actinobacillus porcitonsillarum" are distinguished by their haemolytic activities, the latter organism being haemolytic and the former, non-haemolytic. Analysis of a whole genome shotgun sequence, however, revealed that A. minor strain 202, like "A. porcitonsillarum", possesses a haemolysin-encoding apxII operon. The purpose of this study was therefore to investigate haemolysin production by this organism and also by three additional members of the A. minor/"porcitonsillarum" complex, strains 33PN and 7ATS and A. minor strain NM305(T). Primers based on sequences within the apxII genes of strain 202 allowed the amplification of appropriately sized fragments from DNA from strain 33PN suggesting that this organism also possesses an apxII operon. Analysis of a whole genome shotgun sequence failed to reveal any trace of an apxII operon in strain NM305(T) and attempts to amplify apxII genes from DNA from strain 7ATS also failed. Strains 202 and 33PN, and surprisingly, the type strain of A. minor and strain 7ATS, were all found to be haemolysin-positive as growth media from cultures of these organisms could promote the lysis of erythrocytes in suspension. The erythrocyte specificities of the haemolysins produced by strains 202 and 33PN indicated that the haemolytic activities exhibited by these organisms were due to ApxII. In keeping with the apparent lack of apxII genes in strains NM305(T) and 7ATS, the haemolysins produced by these organisms were not erythrocyte-specific and with both organisms, haemolytic activity appeared to be due to a combination of heat-stable and heat-labile components. The identities of these components, however, remain unknown.
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Affiliation(s)
- Gitanjali Arya
- Department of Natural Resource Sciences, Macdonald Campus, McGill University, 21111 Lakeshore Road, Ste. Anne de Bellevue, Que., Canada H9X 3V9
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17
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Li JX, Jiang P, Wang Y, Li YF, Chen W, Wang XW, Li P. Genotyping of Haemophilus parasuis from diseased pigs in China and prevalence of two coexisting virus pathogens. Prev Vet Med 2009; 91:274-9. [PMID: 19586670 DOI: 10.1016/j.prevetmed.2009.06.004] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2008] [Revised: 05/10/2009] [Accepted: 06/03/2009] [Indexed: 10/20/2022]
Abstract
From December 2003 to July 2006, a total of 131 (28.4%) Haemophilus parasuis strains were isolated from 462 cases examined in our diagnostic laboratory. These strains were isolated from clinically diseased pigs, and 50 of them along with 15 reference strains of all known serovars were subjected to PCR-FRLP (restriction fragment length polymorphism) analysis by tbpA gene. The analysis of the 1.9-kb tbpA amplicon using TaqI, AvaI and RsaI endonucleases produced 9 RFLP patterns for the 15 reference strains and 13 patterns for the 50 field isolates. And the first three prevalent genotypes in China were DBN (38%), ABN (18%) and DBP (12%). Meanwhile, co-infection of H. parasuis, PRRSV and PCV2 was examined in the 462 pig herds. It is indicated that 11.5% cases (53), 27.9% cases (129) and 4.8% cases (22) were infected only by H. parasuis, PRRSV and PCV2, respectively; and 19.2% cases (89) and 3.0% cases (14) were co-infected with two or all of the three pathogens, respectively; the rest 33.6% cases (155) were not infected by any of the three pathogens. It is confirmed that H. parasuis existed widely in southeast China with numerous genotypes.
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Affiliation(s)
- Jun-xing Li
- Key Laboratory of Animal Diseases Diagnostic and Immunology, College of Veterinary Medicine, Nanjing Agricultural University, Ministry of Agriculture, Nanjing, China
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18
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Ohba T, Shibahara T, Kobayashi H, Takashima A, Minami Y, Kubo M. Granulomatous Lymphadenitis and Pneumonia Associated with Actinobacillus porcitonsillarum in a Slaughter Pig. J Comp Pathol 2007; 137:82-86. [PMID: 17629969 DOI: 10.1016/j.jcpa.2007.04.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2006] [Accepted: 03/30/2007] [Indexed: 10/23/2022]
Abstract
Multiple coalescing granulomatous foci were detected in the pulmonary hilar and mediastinal lymph nodes and lung of a slaughtered pig aged 6 months. Haemolytic, Gram-negative bacilli were isolated from the lymph nodes. The isolate (strain TO17214) strongly cross-reacted with sera against Actinobacillus pleuropneumoniae serotype 12 in slide agglutination tests. Comparative 16S rDNA gene sequencing analysis identified strain TO17214 as Actinobacillus porcitonsillarum. Histologically, extensive inflammation took the form of large granulomas consisting of epithelioid cells and multinucleated giant cells in the lymph nodes and lung, and Gram-negative bacilli were discernible in the centres of the lesions. Immunohistochemically, the organisms cross-reacted with polyclonal antibodies against A. pleuropneumoniae serotypes 12 and 2. The results indicated that A. porcitonsillarum, previously considered non-pathogenic, can induce multifocal granulomatous lymphadenitis accompanied by pneumonia in the growing-finishing pig.
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Affiliation(s)
- T Ohba
- Toyama Prefectural Meat Inspection Centre, 28-4 Shinbori, Imizu 934-0035
| | - T Shibahara
- Epidemiological Research Team, National Institute of Animal Health, 3-1-5 Kannondai, Tsukuba 305-0856, Japan.
| | - H Kobayashi
- Epidemiological Research Team, National Institute of Animal Health, 3-1-5 Kannondai, Tsukuba 305-0856, Japan
| | | | | | - M Kubo
- Epidemiological Research Team, National Institute of Animal Health, 3-1-5 Kannondai, Tsukuba 305-0856, Japan
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19
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Olvera A, Segalés J, Aragón V. Update on the diagnosis of Haemophilus parasuis infection in pigs and novel genotyping methods. Vet J 2006; 174:522-9. [PMID: 17175186 DOI: 10.1016/j.tvjl.2006.10.017] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2006] [Revised: 09/15/2006] [Accepted: 10/20/2006] [Indexed: 11/24/2022]
Abstract
Haemophilus parasuis causes Glässer's disease as well as a number of other diseases in pigs. The diagnosis of H. parasuis-associated disease is usually established by clinical signs, pathological findings and bacterial isolation but diagnosis is complicated by the existence of non-virulent strains and the early colonisation of the upper respiratory tract of healthy piglets. Moreover, several strains can be found on a farm and even within a single animal so it is important to determine the specific strain that is causing the clinical outbreak. Recently, genotyping methods have been developed with the goal of correlating genotype with the degree of virulence of H. parasuis strains. The association between genotype and virulence in H. parasuis is challenging due to the lack of knowledge of the complete genomic sequence and virulence factors of this bacterium.
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Affiliation(s)
- Alex Olvera
- Centre de Recerca en Sanitat Animal (CReSA), Campus de Bellaterra, Universitat Autònoma de Barcelona, Barcelona, Spain
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20
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Angen O, Oliveira S, Ahrens P, Svensmark B, Leser TD. Development of an improved species specific PCR test for detection of Haemophilus parasuis. Vet Microbiol 2006; 119:266-76. [PMID: 17113728 DOI: 10.1016/j.vetmic.2006.10.008] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2006] [Revised: 09/28/2006] [Accepted: 10/06/2006] [Indexed: 11/19/2022]
Abstract
A PCR test for identification of Haemophilus parasuis was optimized using the 16S rDNA sequences of the 15 serotype reference strains of H. parasuis. The test was evaluated on a collection of 218 Danish field isolates as well as on 81 representatives of 27 other species, including genetically affiliated species within Pasteurellaceae. In addition, DNA preparations from 56 H. parasuis isolates from North America were included. To obtain a test that was specific for H. parasuis, a multiplex PCR using 3 different primers was developed. The PCR test produced an amplicon of approximately 1090 bp only with representatives of H. parasuis. The test was further evaluated on 55 clinical samples from 16 Danish pigs suspected for being infected with H. parasuis, showing polyserositis or septicemia at autopsy as well as on 492 nasal swabs. The test was compared with the performance of a PCR test earlier published by Oliveira et al. [Oliveira, S., Galina, L., Pijoan, C., 2001. Development of a PCR test to diagnose Haemophilus parasuis infections. J. Vet. Diagn. Invest. 13, 495-501]. The sensitivity of the present PCR test was found to be slightly lower when applied on clinical samples from diseased pigs and 10-fold lower when tested on pure cultures of H. parasuis (5CFU and 0.5CFU/PCR reaction, respectively). Addition of 1.4 x 10(5) Escherichia coli to each PCR tube did not alter the sensitivity of the tests. No difference in sensitivity of the tests was observed when tested on purified DNA. On the other hand, the present PCR test was found to be 100% species specific for H. parasuis, in contrast to the PCR test of Oliveira et al., which also tested positive for strains belonging to A. indolicus, A. porcinus, and A. minor, species commonly occurring in the upper respiratory tract. However, when the PCR test of Oliveira et al. is used on samples from systemic locations the chances for false positive results are apparently low. The present PCR test represents a rapid and reliable method for genetically based identification of H. parasuis. The high species specificity of the test makes it suitable for detection of H. parasuis in clinical samples, regardless of the presence of affiliated species and contaminating flora. As the two PCR tests differ in sensitivity and specificity, the use of both PCR tests for different purposes is a possibility.
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Affiliation(s)
- Oystein Angen
- Danish Institute for Food and Veterinary Research, Bülowsvej 27, DK-1790 Copenhagen, Denmark.
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21
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Gerlach G, Reidl J. NAD+ utilization in Pasteurellaceae: simplification of a complex pathway. J Bacteriol 2006; 188:6719-27. [PMID: 16980474 PMCID: PMC1595515 DOI: 10.1128/jb.00432-06] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Affiliation(s)
- Gabriele Gerlach
- Institut für Hygiene und Mikrobiologie, Universität Würzburg, Josef Schneider Str. 2, E1, 97080 Würzburg, Germany
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22
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Olvera A, Calsamiglia M, Aragon V. Genotypic diversity of Haemophilus parasuis field strains. Appl Environ Microbiol 2006; 72:3984-92. [PMID: 16751506 PMCID: PMC1489591 DOI: 10.1128/aem.02834-05] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Haemophilus parasuis is the cause of Glässer's disease and other clinical disorders in pigs. It can also be isolated from the upper respiratory tracts of healthy pigs, and isolates can have significant differences in virulence. In this work, a partial sequence from the 60-kDa heat shock protein (Hsp60) gene was assessed as an epidemiological marker. We analyzed partial sequences of hsp60 and 16S rRNA genes from 103 strains of H. parasuis and other related species to obtain a better classification of the strains and examine the correlation with virulence. The results were compared with those obtained by enterobacterial repetitive intergenic consensus PCR. Our results showed that hsp60 is a reliable marker for epidemiological studies of H. parasuis and that the analysis of its sequence is a better approach than fingerprinting methods. Furthermore, the analysis of the hsp60 and 16S rRNA gene sequences revealed the presence of a separate lineage of virulent strains and indicated the occurrence of lateral gene transfer among H. parasuis and Actinobacillus strains.
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Affiliation(s)
- A Olvera
- Centre de Recerca en Sanitat Animal (CReSA), Campus de Bellaterra, Universitat Autònoma de Barcelona, 08193-Bellaterra, Barcelona, Spain
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23
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Christensen H, Bisgaard M. Revised definition of Actinobacillus sensu stricto isolated from animals. A review with special emphasis on diagnosis. Vet Microbiol 2004; 99:13-30. [PMID: 15019108 DOI: 10.1016/j.vetmic.2003.12.002] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2003] [Accepted: 12/02/2003] [Indexed: 11/16/2022]
Abstract
The taxonomy of the members of the genus Actinobacillus associated with animals has been reviewed with focus on classification and identification including molecular based characterization, typing and identification. Out of the 22 species or species like taxa reported as Actinobacillus, 19 are associated with animals. When classified on the basis of 16S rRNA sequence based phylogenetic analysis, DNA-DNA hybridizations and phenotypic analysis, Actinobacillus sensu stricto is restricted to include A. lignieresii, A. pleuropneumoniae, A. equuli subsp. equuli, A. equuli subsp. haemolyticus (taxon 11 of Bisgaard), A. hominis, A. suis, A. ureae, A. arthritidis (taxon 9 of Bisgaard), Actinobacillus genomospecies 1 and 2 and the taxa 8 and 26 of Bisgaard. The remaining 11 species of Actinobacillus are unrelated to A. sensu stricto and should consequently be grouped with other genera or be renamed as new genera depending on new data. Identification of members of Actinobacillus at species level is possible through phenotypic characterization combined with information on host of isolation. PCR tests are available for specific detection of A. pleuropneumoniae. Only A. pleuropneumoniae is presently considered as a primary pathogen. Based on different types of RTX genes it is possible to PCR type A. pleuropneumoniae to serotype level. PCR might also be used for the specific detection of A. equuli subsp. haemolyticus. Epidemiological investigations and surveillance have so far included serotyping, multilocus enzyme electrophoresis (MLEE), ribotyping and restriction fragment length profiling.
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Affiliation(s)
- Henrik Christensen
- Department of Veterinary Microbiology, The Royal Veterinary and Agricultural University, Stigbøjlen 4, 1870 Frederiksberg C, Denmark.
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Oliveira S, Pijoan C. Haemophilus parasuis: new trends on diagnosis, epidemiology and control. Vet Microbiol 2004; 99:1-12. [PMID: 15019107 DOI: 10.1016/j.vetmic.2003.12.001] [Citation(s) in RCA: 236] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2003] [Revised: 08/04/2003] [Indexed: 11/26/2022]
Abstract
Haemophilus parasuis is a commensal organism of the upper respiratory tract of conventional pigs, but under appropriate conditions can invade and cause severe systemic disease, characterized by fibrinous polyserositis, arthritis and meningitis. Factors involved in systemic invasion by H. parasuis remain largely unknown. However, major advances in our knowledge of H. parasuis include (1) development of a species-specific PCR test to detect H. parasuis in clinical samples, (2) study of molecular epidemiology within and between herds, by use of a repetitive element-based PCR, (3) the proposal of an alternative serotyping technique, (4) development and testing of a new in vivo model for pathogenesis and virulence studies, and (5) use of controlled exposure of young pigs to low doses of live, virulent H. parasuis strains to reduce nursery mortality in affected swine herds.
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Affiliation(s)
- Simone Oliveira
- Department of Clinical and Population Sciences, College of Veterinary Medicine, University of Minnesota, 385 Animal Science/Veterinary Medicine, 1988 Fitch Avenue, Saint Paul, MN 55108, USA.
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25
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Gottschalk M, Broes A, Mittal KR, Kobisch M, Kuhnert P, Lebrun A, Frey J. Non-pathogenic Actinobacillus isolates antigenically and biochemically similar to Actinobacillus pleuropneumoniae: a novel species? Vet Microbiol 2003; 92:87-101. [PMID: 12488073 DOI: 10.1016/s0378-1135(02)00341-3] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Two unusual Actinobacillus isolates were recovered from pigs with no clinical signs, no lesions and no history of swine pleuropneumonia. Two representative strains (9953L55 and 0347) analyzed in this study were initially biochemically and antigenically identified as A. pleuropneumoniae serotypes 1 and 9, respectively, by traditional identification methods. Both strains presented, however, negative results with three A. pleuropneumoniae-specific PCR tests and revealed in particular the absence of the apxIV toxin genes. However, both strains produced and secreted ApxII toxin although they only harbored the toxin genes apxIICA, which is an uncommon feature for any of the known A. pleuropneumoniae serotypes. Upon experimental inoculation of pigs, these strains proved to be totally non-pathogenic. Animals infected with one of the strains produced antibodies that cross-react with A. pleuropneumoniae serotypes 1-9-11-specific LC-LPS ELISA. Phylogenetic analysis based on 16S rRNA gene sequence analysis revealed that these strains form a separate phylogenetic group that is distinct from other Actinobacillus species and is particularly different from A. pleuropneumoniae.
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Affiliation(s)
- M Gottschalk
- Groupe de Recherche sur les Maladies Infectieuses du Porc (GREMIP), Département de Pathologie et Microbiologie, Faculté de médecine vétérinaire, Université de Montréal, C.P. 5000, St-Hyacinthe, Quebec, Canada J2S 7C6.
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