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Kobayashi K, Kubota H, Tohya M, Ushikubo M, Yamamoto M, Ariyoshi T, Uchitani Y, Mitobe M, Okuno R, Nakagawa I, Sekizaki T, Suzuki J, Sadamasu K. Characterization of pig tonsils as niches for the generation of Streptococcus suis diversity. Vet Res 2024; 55:17. [PMID: 38321502 PMCID: PMC10848530 DOI: 10.1186/s13567-024-01270-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Accepted: 01/12/2024] [Indexed: 02/08/2024] Open
Abstract
Streptococcus suis is a gram-positive bacterium that causes meningitis, septicemia, endocarditis, and other disorders in pigs and humans. We obtained 42 and 50 S. suis isolates from lesions of porcine endocarditis and palatine tonsils, respectively, of clinically healthy pigs in Japan; we then determined their sequence types (STs) by multilocus sequence typing (MLST), cps genotypes, serotypes, and presence of classical major virulence-associated marker genes (mrp, epf, and sly). The 42 isolates from endocarditis lesions were assigned to a limited number of STs and clonal complexes (CCs). On the other hand, the 50 isolates from tonsils were diverse in these traits and seemingly in the degree of virulence, suggesting that tonsils can accommodate a variety of S. suis isolates. The goeBURST full algorithm using tonsil isolates obtained in this study and those retrieved from the database showed that major CCs as well as many other clusters were composed of isolates originating from different countries, and some of the STs were very similar to each other despite the difference in country of origin. These findings indicate that S. suis with not only different but also similar mutations in the genome have survived in tonsils independently across different geographical locations. Therefore, unlike the lesions of endocarditis, the tonsils of pigs seemingly accommodate various S. suis lineages. The present study suggests that S. suis acquired its diversity by natural mutations during colonization and persistence in the tonsils of pigs.
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Affiliation(s)
- Kai Kobayashi
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Hyakunincho 3-24-1, Shinjuku-ku, Tokyo, 169-0073, Japan.
| | - Hiroaki Kubota
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Hyakunincho 3-24-1, Shinjuku-ku, Tokyo, 169-0073, Japan
| | - Mari Tohya
- Division of Biomedical Food Research, National Institute of Health Sciences, Tonomachi 3-25-26, Kawasaki-ku, Kawasaki-shi, Kanagawa, 210-9501, Japan
- Department of Microbiology and Department of Microbiome Research, Juntendo University School of Medicine, Hongo 2-1-1, Bunkyo-ku, Tokyo, 113-8421, Japan
| | - Megumi Ushikubo
- Shibaura Meat Sanitary Inspection Station, Tokyo Metropolitan Government, Konan 2-7-19, Minato-ku, Tokyo, 108-0075, Japan
| | - Miki Yamamoto
- Shibaura Meat Sanitary Inspection Station, Tokyo Metropolitan Government, Konan 2-7-19, Minato-ku, Tokyo, 108-0075, Japan
| | - Tsukasa Ariyoshi
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Hyakunincho 3-24-1, Shinjuku-ku, Tokyo, 169-0073, Japan
| | - Yumi Uchitani
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Hyakunincho 3-24-1, Shinjuku-ku, Tokyo, 169-0073, Japan
| | - Morika Mitobe
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Hyakunincho 3-24-1, Shinjuku-ku, Tokyo, 169-0073, Japan
| | - Rumi Okuno
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Hyakunincho 3-24-1, Shinjuku-ku, Tokyo, 169-0073, Japan
| | - Ichiro Nakagawa
- Department of Microbiology, Graduate School of Medicine, Kyoto University, Yoshida-Konoe-cho, Sakyo-ku, Kyoto, 606-8501, Japan
| | - Tsutomu Sekizaki
- Department of Microbiology, Graduate School of Medicine, Kyoto University, Yoshida-Konoe-cho, Sakyo-ku, Kyoto, 606-8501, Japan
- Research Center for Food Safety, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo, 113-8657, Japan
| | - Jun Suzuki
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Hyakunincho 3-24-1, Shinjuku-ku, Tokyo, 169-0073, Japan
| | - Kenji Sadamasu
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Hyakunincho 3-24-1, Shinjuku-ku, Tokyo, 169-0073, Japan
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Xi H, Fu Y, Chen C, Feng X, Han W, Gu J, Ji Y. Aerococcus viridans Phage Lysin AVPL Had Lytic Activity against Streptococcus suis in a Mouse Bacteremia Model. Int J Mol Sci 2023; 24:16670. [PMID: 38068990 PMCID: PMC10706753 DOI: 10.3390/ijms242316670] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2023] [Revised: 11/19/2023] [Accepted: 11/22/2023] [Indexed: 12/18/2023] Open
Abstract
Streptococcus suis (S. suis) is a swine pathogen that can cause sepsis, meningitis, endocarditis, and other infectious diseases; it is also a zoonotic pathogen that has caused a global surge in fatal human infections. The widespread prevalence of multidrug-resistant S. suis strains and the decline in novel antibiotic candidates have necessitated the development of alternative antimicrobial agents. In this study, AVPL, the Aerococcus viridans (A. viridans) phage lysin, was found to exhibit efficient bactericidal activity and broad lytic activity against multiple serotypes of S. suis. A final concentration of 300 μg/mL AVPL reduced S. suis counts by 4-4.5 log10 within 1 h in vitro. Importantly, AVPL effectively inhibited 48 h S. suis biofilm formation and disrupted preformed biofilms. In a mouse model, 300 μg/mouse AVPL protected 100% of mice from infection following the administration of lethal doses of multidrug-resistant S. suis type 2 (SS2) strain SC19, reduced the bacterial load in different organs, and effectively alleviated inflammation and histopathological damage in infected mice. These data suggest that AVPL is a valuable candidate antimicrobial agent for treating S. suis infections.
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Affiliation(s)
- Hengyu Xi
- State Key Laboratory for Diagnosis and Treatment of Severe Zoonotic Infectious Diseases, Key Laboratory for Zoonosis Research of the Ministry of Education, Institute of Zoonosis, College of Veterinary Medicine, Jilin University, Changchun 130062, China; (H.X.); (Y.F.); (C.C.); (W.H.); (J.G.)
| | - Yao Fu
- State Key Laboratory for Diagnosis and Treatment of Severe Zoonotic Infectious Diseases, Key Laboratory for Zoonosis Research of the Ministry of Education, Institute of Zoonosis, College of Veterinary Medicine, Jilin University, Changchun 130062, China; (H.X.); (Y.F.); (C.C.); (W.H.); (J.G.)
| | - Chong Chen
- State Key Laboratory for Diagnosis and Treatment of Severe Zoonotic Infectious Diseases, Key Laboratory for Zoonosis Research of the Ministry of Education, Institute of Zoonosis, College of Veterinary Medicine, Jilin University, Changchun 130062, China; (H.X.); (Y.F.); (C.C.); (W.H.); (J.G.)
| | - Xin Feng
- State Key Laboratory for Diagnosis and Treatment of Severe Zoonotic Infectious Diseases, Key Laboratory for Zoonosis Research of the Ministry of Education, Institute of Zoonosis, College of Veterinary Medicine, Jilin University, Changchun 130062, China; (H.X.); (Y.F.); (C.C.); (W.H.); (J.G.)
| | - Wenyu Han
- State Key Laboratory for Diagnosis and Treatment of Severe Zoonotic Infectious Diseases, Key Laboratory for Zoonosis Research of the Ministry of Education, Institute of Zoonosis, College of Veterinary Medicine, Jilin University, Changchun 130062, China; (H.X.); (Y.F.); (C.C.); (W.H.); (J.G.)
- Jiangsu Co-Innovation Center for the Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou 225009, China
| | - Jingmin Gu
- State Key Laboratory for Diagnosis and Treatment of Severe Zoonotic Infectious Diseases, Key Laboratory for Zoonosis Research of the Ministry of Education, Institute of Zoonosis, College of Veterinary Medicine, Jilin University, Changchun 130062, China; (H.X.); (Y.F.); (C.C.); (W.H.); (J.G.)
- Jiangsu Co-Innovation Center for the Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou 225009, China
| | - Yalu Ji
- State Key Laboratory for Diagnosis and Treatment of Severe Zoonotic Infectious Diseases, Key Laboratory for Zoonosis Research of the Ministry of Education, Institute of Zoonosis, College of Veterinary Medicine, Jilin University, Changchun 130062, China; (H.X.); (Y.F.); (C.C.); (W.H.); (J.G.)
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Nedbalcova K, Kucharovicova I, Zouharova M, Matiaskova K, Kralova N, Brychta M, Simek B, Pecha T, Plodkova H, Matiasovic J. Resistance of Streptococcus suis Isolates from the Czech Republic during 2018–2022. Antibiotics (Basel) 2022; 11:antibiotics11091214. [PMID: 36139993 PMCID: PMC9495191 DOI: 10.3390/antibiotics11091214] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2022] [Revised: 09/02/2022] [Accepted: 09/05/2022] [Indexed: 11/20/2022] Open
Abstract
A determination of susceptibility/resistance to antimicrobials via serotype was carried out in 506 field isolates of Streptococcus suis, originating from pig farms in the Czech Republic in the period 2018–2022. A very high level of susceptibility of S. suis isolates was found to amoxicillin, in combination with clavulanic acid and sulfamethoxazole potentiated with trimethoprim. None of the tested isolates were resistant to these antimicrobial substances. Only two isolates were found to be intermediately resistant to enrofloxacin in 2020. With regard to ceftiofur, one isolate was intermediately resistant in 2020 and 2022, and two isolates were intermediately resistant in 2018 and 2021. A low level of resistance was detected to ampicillin (0.6% in 2021) and to florfenicol (1.15% in 2019; 1.3% in 2022). With regard to penicillin, a medium level of resistance was detected in 2018 (10.6%), but a low level of resistance was found in the following years (7.0% in 2019; 3.1% in 2020; 3.3% in 2021; 3.9% in 2022). On the contrary, a high or very high level of resistance was found to tetracycline (66.0% in 2018; 65.1% in 2019; 44.35% in 2020; 46.4% in 2021; 54.0% in 2022). Using molecular and serological methods, serotype 7 (16.4%) was determined to be predominant among S. suis isolates, followed by serotypes 1/2, 2, 9, 4, 3, 1, 29, 16, and 31 (10.7%; 8.5%; 5.7%; 5.5%; 4.5%; 4.3%; 3.6%; 3.4%; 3.4%, respectively). Other serotypes were identified among the investigated strains either rarely (up to 10 cases) or not at all. A relatively high percentage of isolates were detected as non-typeable (79 isolates; 15.6%). Dependence of resistance upon serotype assignment could not be proven in all but serotype 31, wherein all isolates (n = 17) were resistant or intermediately resistant to clindamycin, tilmycosin, tulathromycin, and tetracycline. The resistance to clindamycin and tetracycline may be related to the high consumption of these antibiotics on pig farms at present or in previous years. Macrolides (tilmicosin and tulathromycin) and tiamulin are not suitable for the treatment of streptococcal infections, but are used on pig farms to treat respiratory infections caused by gram-negative bacteria, so they were included in the study.
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Affiliation(s)
- Katerina Nedbalcova
- Veterinary Research Institute, Hudcova 296/70, 621 00 Brno, Czech Republic
- Correspondence:
| | | | - Monika Zouharova
- Veterinary Research Institute, Hudcova 296/70, 621 00 Brno, Czech Republic
| | | | - Natalie Kralova
- Veterinary Research Institute, Hudcova 296/70, 621 00 Brno, Czech Republic
- Department of Experimental Biology, Faculty of Science, Masaryk University, Kamenice 753/5, 625 00 Brno, Czech Republic
| | - Marek Brychta
- State Veterinary Institute, Rantirovska 93, 586 05 Jihlava, Czech Republic
| | - Bronislav Simek
- State Veterinary Institute, Rantirovska 93, 586 05 Jihlava, Czech Republic
| | - Tomas Pecha
- State Veterinary Institute, Rantirovska 93, 586 05 Jihlava, Czech Republic
| | - Hana Plodkova
- State Veterinary Institute, Rantirovska 93, 586 05 Jihlava, Czech Republic
| | - Jan Matiasovic
- Veterinary Research Institute, Hudcova 296/70, 621 00 Brno, Czech Republic
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Rajkhowa S, Hussain I. Virulence gene profile and antimicrobial resistance of non-typeable Streptococcus suis isolated from clinically healthy and diseased pigs from North East India. Folia Microbiol (Praha) 2022; 67:947-953. [PMID: 35900692 DOI: 10.1007/s12223-021-00944-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2021] [Accepted: 12/22/2021] [Indexed: 11/29/2022]
Abstract
The present study was conducted to investigate the virulence gene profile and antimicrobial resistance of non-typeable Streptococcus suis isolates circulating in pigs of North East India. Fifty-two non-typeable S. suis isolates from clinically healthy and diseased pigs were screened by using PCR for the presence of the muramidase-released protein (mrp), extracellular factor (epf), hemolysin suilysin (sly), arginine deiminase (arcA), and glutamate dehydrogenase (gdh) genes. Five different virulence gene profiles were observed and the most predominant virulence gene profile found in healthy pigs was mrp- + sly- + arcA- + gdh + + epf- whereas the most predominant virulence gene profile recorded in diseased pigs was mrp+ + sly- + arcA+ + gdh+ + epf-. Significantly lower carrier rate of mrp+ + sly- + arcA+ + gdh+ + epf- virulence gene profile was observed among the isolates from healthy pigs compared to those from diseased pigs (P < 0.05). Antimicrobial resistance patterns of the S. suis isolates revealed fourteen resistance groups (R1 to R14) where 88.46% isolates showed multi-drug resistance. The most predominant resistance pattern observed was CD-COT-E-TE. This is perhaps the first study reporting virulence gene profile and antimicrobial resistance of non-typeable S. suis isolates from pigs in North East India. The occurrence of relatively high levels of resistance of S. suis to some antimicrobials (e.g. macrolides, tetracyclines, and sulphonamides) as observed in the present study may represent a human health concern.
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Affiliation(s)
- Swaraj Rajkhowa
- ICAR-National Research Centre On Pig, Rani, Guwahati, Assam, 781131, India.
| | - Isfaqul Hussain
- Division of Veterinary Microbiology & Immunology, SKUAST-Kashmir, Srinagar, Kashmir, India
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K V V, Gangwar P, Chaturji Thakor J, Dinesh M, Sahoo M, Singh R, Mahajan S, Qureshi S, Laddika L, Ranjan Sahoo N, K De U. Carrier status of Streptococcus suis in the palatine tonsils of apparently healthy slaughtered pigs of India. J Immunoassay Immunochem 2022; 43:557-578. [PMID: 35354365 DOI: 10.1080/15321819.2022.2048011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Streptococcus suis is an emerging bacterial pathogen of huge economic impact to the swine industry worldwide. The information regarding the carrier status of S. suis in the slaughtered pigs along with its genetic characterization is not available in Indian pig population, which needs to be addressed for the therapeutic and preventive measures. In the present study, 563 palatine tonsils of apparently healthy slaughtered pigs were probed for the prevalence, and genetic characterization of S. suis and prevalence were found to be 15.45% and 32.68% by bacteriological and molecular methods, respectively. In 87 isolates recovered, 6 cps-types were detected showing the predominance of serotype 7 (24.13%) and 5 (18.39%), whereas 11 cps-types were detected in tonsillar DNA involving cps-types 9 (28.26%) and 7 (14.13%) as the major serotypes with arcA+/sly+/epf+/mrp- being the prevalent genotype. The histopathological changes with the immunodetection of S. suis antigen confirmed its persistence in asymptomatic carriers. Of 87 bacterial isolates, 7 isolates (serotypes 7 & 2) were pathogenic to Swiss albino mice showing the classical lesions of meningitis and septicemia. The presence of virulent serotypes of S. suis in healthy slaughtered pigs suggests a great health risk to the people engaged in piggery operations and in-contact pigs.
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Affiliation(s)
- Vishva K V
- Division of Pathology, ICAR-Indian Veterinary Research Institute (IVRI), Izatnagar, India
| | - Pradeep Gangwar
- Division of Pathology, ICAR-Indian Veterinary Research Institute (IVRI), Izatnagar, India
| | | | - Murali Dinesh
- Division of Pathology, ICAR-Indian Veterinary Research Institute (IVRI), Izatnagar, India
| | - Monalisa Sahoo
- Division of Pathology, ICAR-Indian Veterinary Research Institute (IVRI), Izatnagar, India.,International Center for Foot and Mouth Disease, ICAR-DFMD, Arugul, Khordha, India
| | - Rajendra Singh
- Division of Pathology, ICAR-Indian Veterinary Research Institute (IVRI), Izatnagar, India
| | - Sonalika Mahajan
- Division of Veterinary Biotechnology, ICAR-Indian Veterinary Research Institute (IVRI), Izatnagar, India
| | - Salauddin Qureshi
- Division of Biological Standardization, ICAR-Indian Veterinary Research Institute (IVRI), Izatnagar, India
| | - Lahari Laddika
- Division of Biological Standardization, ICAR-Indian Veterinary Research Institute (IVRI), Izatnagar, India
| | - Nihar Ranjan Sahoo
- International Center for Foot and Mouth Disease, ICAR-DFMD, Arugul, Khordha, India
| | - Ujjawal K De
- Division of Medicine, ICAR-Indian Veterinary Research Institute (IVRI), Izatnagar, India
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Jiang X, Zhu L, Zhan D. Development of a recombinase polymerase amplification assay for rapid detection of Streptococcus suis type 2 in nasopharyngeal swab samples. Diagn Microbiol Infect Dis 2021; 102:115594. [PMID: 34871933 DOI: 10.1016/j.diagmicrobio.2021.115594] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Revised: 10/27/2021] [Accepted: 10/29/2021] [Indexed: 12/28/2022]
Abstract
Streptococcus suis serotype 2 (SS2), an emerging zoonotic pathogen, may induce severe infections and symptoms manifested as septicemia, meningitis and even death both in human and pigs. The aim of this article was to develop a new methodology as real-time recombinase polymerase amplification (RT-RPA) assay targeting cps2J gene for the detection of SS2 (or SS1/2). The sensitivity and reproducibility of RT-RPA results were evaluated and compared with a real-time quantitative PCR (RT-qPCR). The established RT-RPA reaction could be completed in 20 minutes with distinguishable specificity against the predominant S. suis infection serotypes of 3, 4, 5, 7, 9, 14, and 31. Lower detection limit for RT-RPA was 102 genomic DNA copies per reaction. The specimen performance of RT-RPA was tested in nasopharyngeal swab samples with the sensitivity and specificity as 97.5% and 100%, respectively. Thus, this RT-RPA method is a rapid and potential molecular diagnostic tool for SS2 detection.
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Affiliation(s)
- Xiaowu Jiang
- Medical School of Yichun University, Yichun, Jiangxi, China; Jiangxi Provincial Key Laboratory of Active Component of Natural Drugs, Poster-Doctoral Research Center, Jiangxi, China.
| | - Lexin Zhu
- Medical School of Yichun University, Yichun, Jiangxi, China
| | - Dongbo Zhan
- Medical School of Yichun University, Yichun, Jiangxi, China
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Direct Detection of Streptococcus suis from Cerebrospinal Fluid, Positive Hemoculture, and Simultaneous Differentiation of Serotypes 1, 1/2, 2, and 14 within Single Reaction. Pathogens 2021; 10:pathogens10080996. [PMID: 34451460 PMCID: PMC8401787 DOI: 10.3390/pathogens10080996] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Revised: 07/28/2021] [Accepted: 08/04/2021] [Indexed: 11/26/2022] Open
Abstract
Streptococcus suis is an emerging zoonotic bacterium causing septicemia and meningitis in humans. Due to rapid disease progression, high mortality rate, and many underdiagnosed cases by time-consuming routine identification methods, alternative diagnostic testing is essential. Among 29 broadly accepted S. suis serotypes, serotypes 2 and 14 are high prevalent; however, many PCR assays showed an inability to differentiate serotype 2 from 1/2, and 1 from 14. In this study, we developed and validated a new multiplex PCR assay that facilitates the identification of only the 29 true serotypes of S. suis and simultaneously differentiates serotypes 1, 1/2, 2, and 14 within a single reaction. Importantly, the multiplex PCR could detect S. suis directly from positive hemocultures and CSF. The results revealed high sensitivity, specificity, and 100% accuracy with almost perfect agreement (κ = 1.0) compared to culture and serotyping methods. Direct detection enables a decrease in overall diagnosis time, rapid and efficient treatment, reduced fatality rates, and proficient disease control. This multiplex PCR offers a rapid, easy, and cost-effective method that can be applied in a routine laboratory. Furthermore, it is promising for developing point-of-care testing (POCT) for S. suis detection in the future.
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Tohya M, Dozaki S, Ishida-Kuroki K, Watanabe T, Sekizaki T. Basis of the persistence of capsule-negative Streptococcus suis in porcine endocarditis inferred from comparative genomics. FEMS Microbiol Lett 2021; 368:6315327. [PMID: 34223887 DOI: 10.1093/femsle/fnab083] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2021] [Accepted: 07/01/2021] [Indexed: 11/14/2022] Open
Abstract
The capsule (cap) of Streptococcus suis is an anti-phagocytic element and is one of the major virulence factors. However, we have found cap-positive and cap-negative isolates in porcine endocarditis. Here, we compared genome sequences of multiple cap-negative isolates with those of a cap-positive isolate from a single endocarditis. Cap-positive and cap-negative isolates from the same pig were phylogenetically closest compared with those from other pigs. Some of cap-negative isolates from the same pig showed different mutations in capsular polysaccharide synthesis (cps) genes, suggesting that these isolates arisen in pigs after infection. Different mutations in whole-genomes were also found among isolates with identical mutations in cps genes, indicating that mutations in cps genes and the whole-genome occurred independently. Since cap-negative isolates are rarely found in lesions of other diseases, these results suggest that endocarditis lesions may simply favored cap-negative mutants to survive the niches, leading to their persistence in the lesions.
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Affiliation(s)
- Mari Tohya
- Research Center for Food Safety, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan.,Department of Microbiology, Juntendo University School of Medicine, Hongo 2-1-1, Bunkyo-ku, Tokyo 113-8421, Japan
| | - Shinichi Dozaki
- Research Center for Food Safety, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Kasumi Ishida-Kuroki
- Research Center for Food Safety, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan.,Antimicrobial Resistance Research Center, National Institute of Infectious Diseases, Aoba-cho 4-2-1, Higashimurayama, Tokyo, 189-0002, Japan
| | - Takayasu Watanabe
- Research Center for Food Safety, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan.,Department of Chemistry, Nihon University School of Dentistry, 1-8-13 Kanda-Surugadai, Chiyoda-ku, Tokyo 101-8310, Japan
| | - Tsutomu Sekizaki
- Research Center for Food Safety, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan.,Department of Microbiology, Graduate School of Medicine, Kyoto University, Yoshida-Konoe-cho, Sakyo-ku, Kyoto, 606-8501, Japan
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9
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Capsular polysaccharide switching in Streptococcus suis modulates host cell interactions and virulence. Sci Rep 2021; 11:6513. [PMID: 33753801 PMCID: PMC7985379 DOI: 10.1038/s41598-021-85882-3] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2020] [Accepted: 03/05/2021] [Indexed: 11/30/2022] Open
Abstract
The capsular polysaccharide (CPS) of Streptococcus suis defines various serotypes based on its composition and structure. Though serotype switching has been suggested to occur between S. suis strains, its impact on pathogenicity and virulence remains unknown. Herein, we experimentally generated S. suis serotype-switched mutants from a serotype 2 strain that express the serotype 3, 4, 7, 8, 9, or 14 CPS. The effects of serotype switching were then investigated with regards to classical properties conferred by presence of the serotype 2 CPS, including adhesion to/invasion of epithelial cells, resistance to phagocytosis by macrophages, killing by whole blood, dendritic cell-derived pro-inflammatory mediator production and virulence using mouse and porcine infection models. Results demonstrated that these properties on host cell interactions were differentially modulated depending on the switched serotypes, although some different mutations other than loci of CPS-related genes were found in each the serotype-switched mutant. Among the serotype-switched mutants, the mutant expressing the serotype 8 CPS was hyper-virulent, whereas mutants expressing the serotype 3 or 4 CPSs had reduced virulence. By contrast, switching to serotype 7, 9, or 14 CPSs had little to no effect. These findings suggest that serotype switching can drastically alter S. suis virulence and host cell interactions.
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Tram G, Jennings MP, Blackall PJ, Atack JM. Streptococcus suis pathogenesis-A diverse array of virulence factors for a zoonotic lifestyle. Adv Microb Physiol 2021; 78:217-257. [PMID: 34147186 DOI: 10.1016/bs.ampbs.2020.12.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Streptococcus suis is a major cause of respiratory tract and invasive infections in pigs and is responsible for a substantial disease burden in the pig industry. S. suis is also a significant cause of bacterial meningitis in humans, particularly in South East Asia. S. suis expresses a wide array of virulence factors, and although many are described as being required for disease, no single factor has been demonstrated to be absolutely required. The lack of uniform distribution of known virulence factors among individual strains and lack of evidence that any particular virulence factor is essential for disease makes the development of vaccines and treatments challenging. Here we review the current understanding of S. suis virulence factors and their role in the pathogenesis of this important zoonotic pathogen.
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Affiliation(s)
- Greg Tram
- Institute for Glycomics, Griffith University, Gold Coast, QLD, Australia
| | - Michael P Jennings
- Institute for Glycomics, Griffith University, Gold Coast, QLD, Australia
| | - Patrick J Blackall
- Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, St. Lucia, QLD, Australia
| | - John M Atack
- Institute for Glycomics, Griffith University, Gold Coast, QLD, Australia.
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11
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Arenas J, Bossers-de Vries R, Harders-Westerveen J, Buys H, Ruuls-van Stalle LMF, Stockhofe-Zurwieden N, Zaccaria E, Tommassen J, Wells JM, Smith HE, de Greeff A. In vivo transcriptomes of Streptococcus suis reveal genes required for niche-specific adaptation and pathogenesis. Virulence 2020; 10:334-351. [PMID: 30957693 PMCID: PMC6527017 DOI: 10.1080/21505594.2019.1599669] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Streptococcus suis is a Gram-positive bacterium and a zoonotic pathogen residing in the nasopharynx or the gastrointestinal tract of pigs with a potential of causing life-threatening invasive disease. It is endemic in the porcine production industry worldwide, and it is also an emerging human pathogen. After invasion, the pathogen adapts to cause bacteremia and disseminates to different organs including the brain. To gain insights in this process, we infected piglets with a highly virulent strain of S. suis, and bacterial transcriptomes were obtained from blood and different organs (brain, joints, and heart) when animals had severe clinical symptoms of infection. Microarrays were used to determine the genome-wide transcriptional profile at different infection sites and during growth in standard growth medium in vitro. We observed differential expression of around 30% of the Open Reading Frames (ORFs) and infection-site specific patterns of gene expression. Genes with major changes in expression were involved in transcriptional regulation, metabolism, nutrient acquisition, stress defenses, and virulence, amongst others, and results were confirmed for a subset of selected genes using RT-qPCR. Mutants were generated in two selected genes, and the encoded proteins, i.e., NADH oxidase and MetQ, were shown to be important virulence factors in coinfection experiments and in vitro assays. The knowledge derived from this study regarding S. suis gene expression in vivo and identification of virulence factors is important for the development of novel diagnostic and therapeutic strategies to control S. suis disease.
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Affiliation(s)
- Jesús Arenas
- a Department of Infection Biology , Wageningen BioVeterinary Research (WBVR) , Lelystad , The Netherlands
| | - Ruth Bossers-de Vries
- a Department of Infection Biology , Wageningen BioVeterinary Research (WBVR) , Lelystad , The Netherlands
| | - José Harders-Westerveen
- a Department of Infection Biology , Wageningen BioVeterinary Research (WBVR) , Lelystad , The Netherlands
| | - Herma Buys
- a Department of Infection Biology , Wageningen BioVeterinary Research (WBVR) , Lelystad , The Netherlands
| | | | | | - Edoardo Zaccaria
- b Host Microbe Interactions , Wageningen UR , Wageningen , The Netherlands
| | - Jan Tommassen
- c Department of Molecular Microbiology and Institute of Biomembranes , Utrecht University , Utrecht , The Netherlands
| | - Jerry M Wells
- b Host Microbe Interactions , Wageningen UR , Wageningen , The Netherlands
| | - Hilde E Smith
- a Department of Infection Biology , Wageningen BioVeterinary Research (WBVR) , Lelystad , The Netherlands
| | - Astrid de Greeff
- a Department of Infection Biology , Wageningen BioVeterinary Research (WBVR) , Lelystad , The Netherlands
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12
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Meekhanon N, Kaewmongkol S, Jirawattanapong P, Kaminsonsakul T, Kongsoi S, Chumsing S, Okura M, Ueno Y, Sekizaki T, Takamatsu D. High rate misidentification of biochemically determined Streptococcus isolates from swine clinical specimens. J Vet Med Sci 2019; 81:567-572. [PMID: 30814435 PMCID: PMC6483909 DOI: 10.1292/jvms.18-0678] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
In this study, 22 bacterial isolates from swine necropsy specimens, which were biochemically identified as Streptococcus suis and other Streptococcus species, were re-examined using species-specific PCR for authentic S. suis and 16S rRNA gene sequencing for the verification of the former judge. Identification of S. suis on the basis of biochemical characteristics showed high false-positive (70.6%) and false-negative (60%) rates. The authentic S. suis showed various capsular polysaccharide synthesis gene types, including type 2 that often isolated from human cases. Five of 22 isolates did not even belong to the genus Streptococcus. These results suggested that the misidentification of the causative pathogen in routine veterinary diagnosis could be a substantial obstacle for the control of emerging infectious diseases.
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Affiliation(s)
- Nattakan Meekhanon
- Department of Veterinary Technology, Faculty of Veterinary Technology, Kasetsart University, Bangkok 10900, Thailand
| | - Sarawan Kaewmongkol
- Department of Veterinary Technology, Faculty of Veterinary Technology, Kasetsart University, Bangkok 10900, Thailand
| | - Pichai Jirawattanapong
- Department of Farm Resources and Production Medicines, Faculty of Veterinary Medicine, Kasetsart University, Nakhon Pathom 73140, Thailand
| | - Tanyanant Kaminsonsakul
- Kamphaengsaen Veterinary Diagnostic Unit, Faculty of Veterinary Medicine, Kasetsart University, Nakhon Pathom 73140, Thailand
| | - Siriporn Kongsoi
- Department of Veterinary Public Health, Faculty of Veterinary Medicine, Kasetsart University, Nakhon Pathom 73140, Thailand
| | - Suksan Chumsing
- Department of Veterinary Public Health, Faculty of Veterinary Medicine, Kasetsart University, Nakhon Pathom 73140, Thailand
| | - Masatoshi Okura
- Division of Bacterial and Parasitic Disease, National Institute of Animal Health, National Agriculture and Food Research Organization, Tsukuba, Ibaraki 305-0856, Japan
| | - Yuichi Ueno
- Division of Bacterial and Parasitic Disease, National Institute of Animal Health, National Agriculture and Food Research Organization, Tsukuba, Ibaraki 305-0856, Japan
| | - Tsutomu Sekizaki
- Research Center for Food Safety, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo 113-8657, Japan
| | - Daisuke Takamatsu
- Division of Bacterial and Parasitic Disease, National Institute of Animal Health, National Agriculture and Food Research Organization, Tsukuba, Ibaraki 305-0856, Japan.,The United Graduate School of Veterinary Sciences, Gifu University, Gifu, Gifu 501-1193, Japan
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13
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Rendueles O, de Sousa JAM, Bernheim A, Touchon M, Rocha EPC. Genetic exchanges are more frequent in bacteria encoding capsules. PLoS Genet 2018; 14:e1007862. [PMID: 30576310 PMCID: PMC6322790 DOI: 10.1371/journal.pgen.1007862] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2018] [Revised: 01/07/2019] [Accepted: 11/29/2018] [Indexed: 12/12/2022] Open
Abstract
Capsules allow bacteria to colonize novel environments, to withstand numerous stresses, and to resist antibiotics. Yet, even though genetic exchanges with other cells should be adaptive under such circumstances, it has been suggested that capsules lower the rates of homologous recombination and horizontal gene transfer. We analysed over one hundred pan-genomes and thousands of bacterial genomes for the evidence of an association between genetic exchanges (or lack thereof) and the presence of a capsule system. We found that bacteria encoding capsules have larger pan-genomes, higher rates of horizontal gene transfer, and higher rates of homologous recombination in their core genomes. Accordingly, genomes encoding capsules have more plasmids, conjugative elements, transposases, prophages, and integrons. Furthermore, capsular loci are frequent in plasmids, and can be found in prophages. These results are valid for Bacteria, independently of their ability to be naturally transformable. Since we have shown previously that capsules are commonly present in nosocomial pathogens, we analysed their co-occurrence with antibiotic resistance genes. Genomes encoding capsules have more antibiotic resistance genes, especially those encoding efflux pumps, and they constitute the majority of the most worrisome nosocomial bacteria. We conclude that bacteria with capsule systems are more genetically diverse and have fast-evolving gene repertoires, which may further contribute to their success in colonizing novel niches such as humans under antibiotic therapy. Previous works showed that bacteria encoding capsules are better colonizers and are dominant in most environments suggesting a positive role for capsules in the genetic diversification of bacteria. Yet, it has been repeatedly suggested, based almost exclusively studies in few model species, that such bacteria are less diverse and engage in fewer genetic exchanges. Here, we reverse the current paradigm and show that bacteria encoding capsules have larger and more diverse gene repertoires, which change faster by horizontal gene transfer and recombination. Our study alters the traditional view of the capsule as a barrier to gene flow and raises novel questions about the role of capsules in bacterial adaptation.
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Affiliation(s)
- Olaya Rendueles
- Microbial Evolutionary Genomics, Institut Pasteur, Paris, France
- UMR 3525, CNRS, Paris, France
- * E-mail:
| | - Jorge A. Moura de Sousa
- Microbial Evolutionary Genomics, Institut Pasteur, Paris, France
- UMR 3525, CNRS, Paris, France
| | - Aude Bernheim
- Microbial Evolutionary Genomics, Institut Pasteur, Paris, France
- UMR 3525, CNRS, Paris, France
| | - Marie Touchon
- Microbial Evolutionary Genomics, Institut Pasteur, Paris, France
- UMR 3525, CNRS, Paris, France
| | - Eduardo P. C. Rocha
- Microbial Evolutionary Genomics, Institut Pasteur, Paris, France
- UMR 3525, CNRS, Paris, France
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14
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Auger JP, Meekhanon N, Okura M, Osaki M, Gottschalk M, Sekizaki T, Takamatsu D. Streptococcus suis Serotype 2 Capsule In Vivo. Emerg Infect Dis 2018; 22:1793-6. [PMID: 27648583 PMCID: PMC5038428 DOI: 10.3201/eid2210.151640] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Many Streptococcus suis isolates from porcine endocarditis in slaughterhouses have lost their capsule and are considered avirulent. However, we retrieved capsule- and virulence-recovered S. suis after in vivo passages of a nonencapsulated strain in mice, suggesting that nonencapsulated S. suis are still potentially hazardous for persons in the swine industry.
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15
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Csl2, a novel chimeric bacteriophage lysin to fight infections caused by Streptococcus suis, an emerging zoonotic pathogen. Sci Rep 2017; 7:16506. [PMID: 29184097 PMCID: PMC5705598 DOI: 10.1038/s41598-017-16736-0] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2017] [Accepted: 11/16/2017] [Indexed: 12/20/2022] Open
Abstract
Streptococcus suis is a Gram-positive bacterium that infects humans and various animals, causing human mortality rates ranging from 5 to 20%, as well as important losses for the swine industry. In addition, there is no effective vaccine for S. suis and isolates with increasing antibiotic multiresistance are emerging worldwide. Facing this situation, wild type or engineered bacteriophage lysins constitute a promising alternative to conventional antibiotics. In this study, we have constructed a new chimeric lysin, Csl2, by fusing the catalytic domain of Cpl-7 lysozyme to the CW_7 repeats of LySMP lysin from an S. suis phage. Csl2 efficiently kills different S. suis strains and shows noticeable activity against a few streptococci of the mitis group. Specifically, 15 µg/ml Csl2 killed 4.3 logs of S. suis serotype 2 S735 strain in 60 min, in a buffer containing 150 mM NaCl and 10 mM CaCl2, at pH 6.0. We have set up a protocol to form a good biofilm with the non-encapsulated S. suis mutant strain BD101, and the use of 30 µg/ml Csl2 was enough for dispersing such biofilms and reducing 1–2 logs the number of planktonic bacteria. In vitro results have been validated in an adult zebrafish model of infection.
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16
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Rieckmann K, Müller K, Moter A, Baums CG, Seydel A. Streptococcus suis serotype 9 endocarditis and subsequent severe meningitis in a growing pig despite specific bactericidal humoral immunity. JMM Case Rep 2017; 4:e005093. [PMID: 29026620 PMCID: PMC5630962 DOI: 10.1099/jmmcr.0.005093] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Accepted: 04/02/2017] [Indexed: 11/18/2022] Open
Abstract
INTRODUCTION . Meningitis and endocarditis are common pathologies of Streptococcussuis infections in pigs and humans. S. suis serotype 9 strains contribute substantially to health problems in European pig production, and immune prophylaxis against this serotype is very difficult. CASE PRESENTATION . We report the clinical course and histopathological picture of a 10-week-old growing pig following experimental intravenous infection with S. suis serotype 9. The piglet showed rapid onset of severe clinical signs of meningitis 11 days post-intravenous challenge following prime-booster vaccination. Histopathological findings revealed a diffuse fibrinosuppurative leptomeningitis. Additionally, a polyphasic endocarditis valvularis thromboticans with numerous bacterial colonies was diagnosed. Bacteriological culture of the brain and the mitral valve confirmed association with the challenge strain. However, virulent serotype 2 and 9 strains were killed in the blood of this piglet ex vivo prior experimental infection. CONCLUSION . Endocarditis induced by S. suis infection might develop and persist despite the presence of high specific bactericidal activity in the blood. Severe leptomeningitis is a putative sequela of such an endocarditis.
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Affiliation(s)
- Karoline Rieckmann
- Institute for Bacteriology and Mycology, Centre for Infectious Diseases, Faculty of Veterinary Medicine, University Leipzig, Germany
| | - Kristin Müller
- Institute of Pathology, Faculty of Veterinary Medicine, University Leipzig, Germany
| | - Annette Moter
- Biofilmcenter, German Heart Institute Berlin, Germany
| | - Christoph G Baums
- Institute for Bacteriology and Mycology, Centre for Infectious Diseases, Faculty of Veterinary Medicine, University Leipzig, Germany
| | - Anna Seydel
- Institute for Bacteriology and Mycology, Centre for Infectious Diseases, Faculty of Veterinary Medicine, University Leipzig, Germany
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17
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Potentially hazardous Streptococcus suis strains latent in asymptomatic pigs in a major swine production area of Thailand. J Med Microbiol 2017; 66:662-669. [DOI: 10.1099/jmm.0.000483] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
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18
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Critical Streptococcus suis Virulence Factors: Are They All Really Critical? Trends Microbiol 2017; 25:585-599. [PMID: 28274524 DOI: 10.1016/j.tim.2017.02.005] [Citation(s) in RCA: 167] [Impact Index Per Article: 23.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2016] [Revised: 01/30/2017] [Accepted: 02/09/2017] [Indexed: 01/15/2023]
Abstract
Streptococcus suis is an important swine pathogen that can be transmitted to humans by contact with diseased animals or contaminated raw pork products. This pathogen possesses a coat of capsular polysaccharide (CPS) that confers protection against the immune system. Yet, the CPS is not the only virulence factor enabling this bacterium to successfully colonize, invade, and disseminate in its host leading to severe systemic diseases such as meningitis and toxic shock-like syndrome. Indeed, recent research developments, cautiously inventoried in this review, have revealed over 100 'putative virulence factors or traits' (surface-associated or secreted components, regulatory genes or metabolic pathways), of which at least 37 have been claimed as being 'critical' for virulence. In this review we discuss the current contradictions and controversies raised by this explosion of virulence factors and the future directions that may be conceived to advance and enlighten research on S. suis pathogenesis.
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19
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Zheng H, Qiu X, Roy D, Segura M, Du P, Xu J, Gottschalk M. Genotyping and investigating capsular polysaccharide synthesis gene loci of non-serotypeable Streptococcus suis isolated from diseased pigs in Canada. Vet Res 2017; 48:10. [PMID: 28219415 PMCID: PMC5322794 DOI: 10.1186/s13567-017-0417-6] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2016] [Accepted: 01/20/2017] [Indexed: 11/13/2022] Open
Abstract
Streptococcus suis (S. suis) is an important swine pathogen and an emerging zoonotic agent. Most clinical S. suis strains express capsular polysaccharides (CPS), which can be typed by antisera using the coagglutination test. In this study, 79 S. suis strains recovered from diseased pigs in Canada and which could not be typed using antisera were further characterized by capsular gene typing and sequencing. Four patterns of cps locus were observed: (1) fifteen strains were grouped into previously reported serotypes but presented several mutations in their cps loci, when compared to available data from reference strains; (2) seven strains presented a complete deletion of the cps locus, which would result in an inability to synthesize capsule; (3) forty-seven strains were classified in recently described novel cps loci (NCLs); and (4) ten strains carried novel NCLs not previously described. Different virulence gene profiles (based on the presence of mrp, epf, and/or sly) were observed in these non-serotypeable strains. This study provides further insight in understanding the genetic characteristics of cps loci in non-serotypeable S. suis strains recovered from diseased animals. When using a combination of the previously described 35 serotypes and the complete NCL system, the number of untypeable strains recovered from diseased animals in Canada would be significantly reduced.
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Affiliation(s)
- Han Zheng
- State Key Laboratory for Infectious Disease Prevention and Control, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Changping, Beijing, China
| | - Xiaotong Qiu
- State Key Laboratory for Infectious Disease Prevention and Control, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Changping, Beijing, China
| | - David Roy
- Faculty of Veterinary Medicine, Swine and Poultry Infectious Diseases Research Center, University of Montreal, Quebec, Canada
| | - Mariela Segura
- Faculty of Veterinary Medicine, Swine and Poultry Infectious Diseases Research Center, University of Montreal, Quebec, Canada
| | - Pengchen Du
- Institute of Infectious Diseases, Beijing Ditan Hospital, Capital Medical University, Beijing Key Laboratory of Emerging Infectious Diseases, Beijing, People's Republic of China
| | - Jianguo Xu
- State Key Laboratory for Infectious Disease Prevention and Control, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Changping, Beijing, China
| | - Marcelo Gottschalk
- Faculty of Veterinary Medicine, Swine and Poultry Infectious Diseases Research Center, University of Montreal, Quebec, Canada.
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20
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Bai J, Yang Y, Wang S, Gao L, Chen J, Ren Y, Ding W, Muhammad I, Li Y. Syringa oblata Lindl. Aqueous Extract Is a Potential Biofilm Inhibitor in S. suis. Front Pharmacol 2017; 8:26. [PMID: 28194111 PMCID: PMC5278344 DOI: 10.3389/fphar.2017.00026] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2016] [Accepted: 01/16/2017] [Indexed: 11/13/2022] Open
Abstract
Streptococcus suis (S. suis) is a zoonotic pathogen that causes severe disease symptoms in pigs and humans. Syringa oblata Lindl. distributed in the middle latitudes of Eurasia and North America were proved as the most development potential of Chinese Medicine. In this study, biofilm formation by S. suis decreased after growth with 1/2 MIC, 1/4 MIC, or 1/8 MIC of Syringa oblata Lindl. aqueous extract and rutin. Scanning electron microscopy analysis revealed the potential effect of Syringa oblata Lindl. aqueous extract and rutin against biofilm formation by S. suis. Using iTRAQ technology, comparative proteomic analyses was performed at two conditions: 1/2 MIC of Syringa oblata Lindl. aqueous extract treated and non-treated cells. The results revealed the existence of 28 proteins of varying amounts. We found that the majority of the proteins were related to cell growth and metabolism. We also found that Syringa oblata Lindl. Aqueous extract affected the synthesis enzymes. In summary, Syringa oblata Lindl. aqueous extract might be used to inhibit the biofilm formation effectively by S. suis, and the active ingredients of the Syringa oblate Lindl. aqueous extract is rutin. The content of rutin is 9.9 ± 0.089 mg/g dry weight.
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Affiliation(s)
- Jingwen Bai
- College of Veterinary Medicine, Northeast Agricultural University Harbin, China
| | - Yanbei Yang
- College of Veterinary Medicine, Northeast Agricultural University Harbin, China
| | - Shuai Wang
- College of Veterinary Medicine, Northeast Agricultural University Harbin, China
| | - Lingfei Gao
- College of Veterinary Medicine, Northeast Agricultural University Harbin, China
| | - Jianqing Chen
- College of Veterinary Medicine, Northeast Agricultural University Harbin, China
| | - Yongzhi Ren
- College of Veterinary Medicine, Northeast Agricultural University Harbin, China
| | - Wenya Ding
- College of Veterinary Medicine, Northeast Agricultural University Harbin, China
| | - Ishfaq Muhammad
- College of Veterinary Medicine, Northeast Agricultural University Harbin, China
| | - Yanhua Li
- College of Veterinary Medicine, Northeast Agricultural University Harbin, China
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21
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Athey TBT, Teatero S, Lacouture S, Takamatsu D, Gottschalk M, Fittipaldi N. Determining Streptococcus suis serotype from short-read whole-genome sequencing data. BMC Microbiol 2016; 16:162. [PMID: 27449127 PMCID: PMC4957933 DOI: 10.1186/s12866-016-0782-8] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2016] [Accepted: 07/15/2016] [Indexed: 11/30/2022] Open
Abstract
Background Streptococcus suis is divided into 29 serotypes based on a serological reaction against the capsular polysaccharide (CPS). Multiplex PCR tests targeting the cps locus are also used to determine S. suis serotypes, but they cannot differentiate between serotypes 1 and 14, and between serotypes 2 and 1/2. Here, we developed a pipeline permitting in silico serotype determination from whole-genome sequencing (WGS) short-read data that can readily identify all 29 S. suis serotypes. Results We sequenced the genomes of 121 strains representing all 29 known S. suis serotypes. We next combined available software into an automated pipeline permitting in silico serotyping of strains by differential alignment of short-read sequencing data to a custom S. suis cps loci database. Strains of serotype pairs 1 and 14, and 2 and 1/2 could be differentiated by a missense mutation in the cpsK gene. We report a 99 % match between coagglutination- and pipeline-determined serotypes for strains in our collection. We used 375 additional S. suis genomes downloaded from the NCBI’s Sequence Read Archive (SRA) to validate the pipeline. Validation with SRA WGS data resulted in a 92 % match. Included pipeline subroutines permitted us to assess strain virulence marker content and obtain multilocus sequence typing directly from WGS data. Conclusions Our pipeline permits rapid and accurate determination of S. suis serotype, and other lineage information, directly from WGS data. By discriminating between serotypes 1 and 14, and between serotypes 2 and 1/2, our approach solves a three-decade longstanding S. suis typing issue. Electronic supplementary material The online version of this article (doi:10.1186/s12866-016-0782-8) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Taryn B T Athey
- Public Health Ontario Toronto Laboratory, 661 University Avenue, Toronto, ON, M5G 1M1 Canada
| | - Sarah Teatero
- Public Health Ontario Toronto Laboratory, 661 University Avenue, Toronto, ON, M5G 1M1 Canada
| | - Sonia Lacouture
- Groupe de Recherche sur les Maladies Infectieuses du Porc, Faculty of Veterinary Medicine, University of Montreal, St-Hyacinthe, QC, Canada
| | - Daisuke Takamatsu
- Bacterial and Parasitic Diseases Research Division, National Institute of Animal Health, National Agriculture and Food Research Organization, Tsukuba, Japan.,The United Graduate School of Veterinary Sciences, Gifu University, Gifu, Japan
| | - Marcelo Gottschalk
- Groupe de Recherche sur les Maladies Infectieuses du Porc, Faculty of Veterinary Medicine, University of Montreal, St-Hyacinthe, QC, Canada
| | - Nahuel Fittipaldi
- Public Health Ontario Toronto Laboratory, 661 University Avenue, Toronto, ON, M5G 1M1 Canada. .,Department of Laboratory Medicine and Pathobiology, Faculty of Medicine, University of Toronto, Toronto, ON, Canada.
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22
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Tohya M, Watanabe T, Maruyama F, Arai S, Ota A, Athey TBT, Fittipaldi N, Nakagawa I, Sekizaki T. Comparative Genome Analyses of Streptococcus suis Isolates from Endocarditis Demonstrate Persistence of Dual Phenotypic Clones. PLoS One 2016; 11:e0159558. [PMID: 27433935 PMCID: PMC4951133 DOI: 10.1371/journal.pone.0159558] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2016] [Accepted: 07/04/2016] [Indexed: 11/19/2022] Open
Abstract
Many bacterial species coexist in the same niche as heterogeneous clones with different phenotypes; however, understanding of infectious diseases by polyphenotypic bacteria is still limited. In the present study, encapsulation in isolates of the porcine pathogen Streptococcus suis from persistent endocarditis lesions was examined. Coexistence of both encapsulated and unencapsulated S. suis isolates was found in 26 out of 59 endocarditis samples. The isolates were serotype 2, and belonged to two different sequence types (STs), ST1 and ST28. The genomes of each of the 26 pairs of encapsulated and unencapsulated isolates from the 26 samples were sequenced. The data showed that each pair of isolates had one or more unique nonsynonymous mutations in the cps gene, and the encapsulated and unencapsulated isolates from the same samples were closest to each other. Pairwise comparisons of the sequences of cps genes in 7 pairs of encapsulated and unencapsulated isolates identified insertion/deletions (indels) ranging from one to 104 bp in different cps genes of unencapsulated isolates. Capsule expression was restored in a subset of unencapsulated isolates by complementation in trans with cps expression vectors. Examination of gene content common to isolates indicated that mutation frequency was higher in ST28 pairs than in ST1 pairs. Genes within mobile genetic elements were mutation hot spots among ST28 isolates. Taken all together, our results demonstrate the coexistence of dual phenotype (encapsulated and unencapsulated) bacterial clones and suggest that the dual phenotypes arose independently in each farm by means of spontaneous mutations in cps genes.
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Affiliation(s)
- Mari Tohya
- Research Center for Food Safety, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku, Tokyo, Japan
| | - Takayasu Watanabe
- Research Center for Food Safety, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku, Tokyo, Japan
| | - Fumito Maruyama
- Department of Microbiology, Kyoto University Graduate School of Medicine, Kyoto, Kyoto, Japan
- * E-mail: (TS); (FM)
| | - Sakura Arai
- Research Center for Food Safety, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku, Tokyo, Japan
| | - Atsushi Ota
- Department of Microbiology, Kyoto University Graduate School of Medicine, Kyoto, Kyoto, Japan
| | | | - Nahuel Fittipaldi
- Public Health Ontario, Toronto, Ontario, Canada
- Department of Laboratory Medicine and Pathobiology, Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada
| | - Ichiro Nakagawa
- Department of Microbiology, Kyoto University Graduate School of Medicine, Kyoto, Kyoto, Japan
| | - Tsutomu Sekizaki
- Research Center for Food Safety, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku, Tokyo, Japan
- * E-mail: (TS); (FM)
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23
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Haas B, Grenier D. Impact of Sub-Inhibitory Concentrations of Amoxicillin on Streptococcus suis Capsule Gene Expression and Inflammatory Potential. Pathogens 2016; 5:pathogens5020037. [PMID: 27104570 PMCID: PMC4931388 DOI: 10.3390/pathogens5020037] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2016] [Revised: 04/11/2016] [Accepted: 04/13/2016] [Indexed: 11/16/2022] Open
Abstract
Streptococcus suis is an important swine pathogen and emerging zoonotic agent worldwide causing meningitis, endocarditis, arthritis and septicemia. Among the 29 serotypes identified to date, serotype 2 is mostly isolated from diseased pigs. Although several virulence mechanisms have been characterized in S. suis, the pathogenesis of S. suis infections remains only partially understood. This study focuses on the response of S. suis P1/7 to sub-inhibitory concentrations of amoxicillin. First, capsule expression was monitored by qRT-PCR when S. suis was cultivated in the presence of amoxicillin. Then, the pro-inflammatory potential of S. suis P1/7 culture supernatants or whole cells conditioned with amoxicillin was evaluated by monitoring the activation of the NF-κB pathway in monocytes and quantifying pro-inflammatory cytokines secreted by macrophages. It was found that amoxicillin decreased capsule expression in S. suis. Moreover, conditioning the bacterium with sub-inhibitory concentrations of amoxicillin caused an increased activation of the NF-κB pathway in monocytes following exposure to bacterial culture supernatants and to a lesser extent to whole bacterial cells. This was associated with an increased secretion of pro-inflammatory cytokines (CXCL8, IL-6, IL-1β) by macrophages. This study identified a new mechanism by which S. suis may increase its inflammatory potential in the presence of sub-inhibitory concentrations of amoxicillin, a cell wall-active antibiotic, thus challenging its use for preventive treatments or as growth factor.
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Affiliation(s)
- Bruno Haas
- Groupe de Recherche en Écologie Buccale (GREB), Faculté de Médecine Dentaire, Université Laval, Quebec City, QC G1V 0A6, Canada.
| | - Daniel Grenier
- Groupe de Recherche en Écologie Buccale (GREB), Faculté de Médecine Dentaire, Université Laval, Quebec City, QC G1V 0A6, Canada.
- Centre de Recherche en Infectiologie Porcine et Avicole (CRIPA), Fonds de Recherche du Québec-Nature et Technologies (FRQNT), Saint-Hyacinthe, QC J2S 2M2, Canada.
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Zaccaria E, Cao R, Wells JM, van Baarlen P. A Zebrafish Larval Model to Assess Virulence of Porcine Streptococcus suis Strains. PLoS One 2016; 11:e0151623. [PMID: 26999052 PMCID: PMC4801416 DOI: 10.1371/journal.pone.0151623] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2015] [Accepted: 02/29/2016] [Indexed: 12/14/2022] Open
Abstract
Streptococcus suis is an encapsulated Gram-positive bacterium, and the leading cause of sepsis and meningitis in young pigs resulting in considerable economic losses in the porcine industry. It is also considered an emerging zoonotic agent. In the environment, both avirulent and virulent strains occur in pigs, and virulent strains appear to cause disease in both humans and pigs. There is a need for a convenient, reliable and standardized animal model to assess S. suis virulence. A zebrafish (Danio rerio) larvae infection model has several advantages, including transparency of larvae, low cost, ease of use and exemption from ethical legislation up to 6 days post fertilization, but has not been previously established as a model for S. suis. Microinjection of different porcine strains of S. suis in zebrafish larvae resulted in highly reproducible dose- and strain-dependent larval death, strongly correlating with presence of the S. suis capsule and to the original virulence of the strain in pigs. Additionally we compared the virulence of the two-component system mutant of ciaRH, which is attenuated for virulence in both mice and pigs in vivo. Infection of larvae with the ΔciaRH strain resulted in significantly higher survival rate compared to infection with the S10 wild-type strain. Our data demonstrate that zebrafish larvae are a rapid and reliable model to assess the virulence of clinical porcine S. suis isolates.
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Affiliation(s)
- Edoardo Zaccaria
- Host-Microbe Interactomics, Department of Animal Sciences, Wageningen University, Wageningen, the Netherlands
| | - Rui Cao
- Host-Microbe Interactomics, Department of Animal Sciences, Wageningen University, Wageningen, the Netherlands
| | - Jerry M. Wells
- Host-Microbe Interactomics, Department of Animal Sciences, Wageningen University, Wageningen, the Netherlands
| | - Peter van Baarlen
- Host-Microbe Interactomics, Department of Animal Sciences, Wageningen University, Wageningen, the Netherlands
- * E-mail:
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25
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Feng L, Zhu J, Chang H, Gao X, Gao C, Wei X, Yuan F, Bei W. The CodY regulator is essential for virulence in Streptococcus suis serotype 2. Sci Rep 2016; 6:21241. [PMID: 26883762 PMCID: PMC4756307 DOI: 10.1038/srep21241] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2015] [Accepted: 01/20/2016] [Indexed: 01/10/2023] Open
Abstract
The main role of CodY, a global regulatory protein in most low G + C gram-positive bacteria, is in transcriptional repression. To study the functions of CodY in Streptococcus suis serotype 2 (S. suis 2), a mutant codY clone named ∆codY was constructed to explore the phenotypic variation between ∆codY and the wild-type strain. The result showed that the codY mutation significantly inhibited cell growth, adherence and invasion ability of S. suis 2 to HEp-2 cells. The codY mutation led to decreased binding of the pathogen to the host cells, easier clearance by RAW264.7 macrophages and decreased growth ability in fresh blood of Cavia porcellus. The codY mutation also attenuated the virulence of S. suis 2 in BALB/c mice. Morphological analysis revealed that the codY mutation decreased the thickness of the capsule of S. suis 2 and changed the surface structures analylized by SDS-PAGE. Finally, the codY mutation altered the expressions of many virulence related genes, including sialic acid synthesis genes, leading to a decreased sialic acid content in capsule. Overall, mutation of codY modulated bacterial virulence by affecting the growth and colonization of S. suis 2, and at least via regulating sialic acid synthesis and capsule thickness.
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Affiliation(s)
- Liping Feng
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, China.,Shanghai Laboratory Animal Research Center, Shanghai 201203, China
| | - Jiawen Zhu
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, China
| | - Haitao Chang
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, China
| | - Xiaoping Gao
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, China
| | - Cheng Gao
- Shanghai Laboratory Animal Research Center, Shanghai 201203, China
| | - Xiaofeng Wei
- Shanghai Laboratory Animal Research Center, Shanghai 201203, China
| | - Fangyan Yuan
- Hubei key laboratory of Animal Embryo and Molecular Breeding, Institute of Animal Husbandry and Veterinary Sciences, Hubei Academy of Agricultural Sciences, Wuhan 430070, China
| | - Weicheng Bei
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, China.,Cooperative Innovation Center of Sustainable Pig Production, Wuhan 430070, China
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26
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Hatrongjit R, Kerdsin A, Gottschalk M, Takeuchi D, Hamada S, Oishi K, Akeda Y. First human case report of sepsis due to infection with Streptococcus suis serotype 31 in Thailand. BMC Infect Dis 2015; 15:392. [PMID: 26420029 PMCID: PMC4588491 DOI: 10.1186/s12879-015-1136-0] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2015] [Accepted: 09/21/2015] [Indexed: 01/11/2023] Open
Abstract
Background Streptococcus suis is a zoonotic pathogen that causes invasive infections in humans and pigs. It has been reported that S. suis infection in humans is mostly caused by serotype 2. However, human cases caused by other serotypes have rarely been reported. This is the first report of a human case of infection with S. suis serotype 31 in Thailand. Case presentation A 55-year-old male alcohol misuser with liver cirrhosis was admitted with sepsis to a hospital in the Central Region of Thailand. He had consumed a homemade, raw pork product prior to the onset of illness. He was alive after treatment with ceftriaxone and no complication occurred. An isolate from blood culture at the hospital was suspected as viridans group Streptococcus. It was confirmed at a reference laboratory as S. suis serotype 31 by biochemical tests, 16S rDNA sequencing, and multiplex polymerase chain reaction for serotyping, but it was untypable by the co-agglutination test with antisera against recognized S. suis serotypes, suggesting loss of capsular material. The absence of a capsule was confirmed by transmission electron microscopy. The isolate was confirmed to be sequence type 221, with 13 putative virulence genes that are usually found in serotype 2 strains. Conclusion We should be aware of the emergence of S. suis infections caused by uncommon serotypes in patients with predisposing conditions. Laboratory capacity to identify S. suis in the hospital is needed in developing countries, which can contribute to enhanced surveillance, epidemiological control, and prevention strategies in the prevalent area. Electronic supplementary material The online version of this article (doi:10.1186/s12879-015-1136-0) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Rujirat Hatrongjit
- Faculty of Science and Engineering, Kasetsart University Chalermphrakiat Sakon Nakhon Province Campus, Muang, Sakon Nakhon Province, 47000, Thailand.
| | - Anusak Kerdsin
- National Institute of Health, Department of Medical Sciences, Ministry of Public Health, Tiwanon Road, Muang, Nonthaburi Province, 11000, Thailand. .,Present address: Faculty of Public Health, Kasetsart University Chalermphrakiat Sakon Nakhon Province Campus, Sakon Nakhon, Thailand.
| | | | - Dan Takeuchi
- Laboratory of Clinical Research on Infectious Diseases, International Research Center for Infectious Diseases, Research Institute for Microbial Diseases, Osaka University, 3-1 Yamadaoka, Suita, Osaka, 565-0871, Japan.
| | - Shigeyuki Hamada
- Thailand-Japan Research Collaboration Center on Emerging and Re-emerging Infections, Nonthaburi Province, Thailand.
| | - Kazunori Oishi
- Infectious Disease Surveillance Center, National Institute of Infectious Diseases, Shinjyuku, Tokyo, Japan.
| | - Yukihiro Akeda
- Laboratory of Clinical Research on Infectious Diseases, International Research Center for Infectious Diseases, Research Institute for Microbial Diseases, Osaka University, 3-1 Yamadaoka, Suita, Osaka, 565-0871, Japan.
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27
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Arai S, Tohya M, Yamada R, Osawa R, Nomoto R, Kawamura Y, Sekizaki T. Development of loop-mediated isothermal amplification to detect Streptococcus suis and its application to retail pork meat in Japan. Int J Food Microbiol 2015; 208:35-42. [PMID: 26043307 DOI: 10.1016/j.ijfoodmicro.2015.05.008] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2015] [Revised: 05/13/2015] [Accepted: 05/15/2015] [Indexed: 10/23/2022]
Abstract
We here developed a novel loop-mediated isothermal amplification (LAMP) method to detect Streptococcus suis in raw pork meat. This method, designated LAMPSS, targeted the recombination/repair protein (recN) gene of S. suis and detected all serotypes of S. suis, except those taxonomically removed from authentic S. suis, i.e., serotypes 20, 22, 26, 32, 33, and 34. The specificity of LAMPSS was confirmed and its detection limit was 5.4cfu/reaction. Among the 966 raw pork meat samples examined, including sliced pork, minced pork, and the liver, tongue, heart, and small intestine, 255 samples tested positive with LAMPSS. The rate of contamination was higher in the organs than in pork. No significant difference was observed in the total bacterial count between LAMPSS-positive and -negative samples. The number of shops that provided LAMPSS-positive pork was slightly higher in those that sold swine organs and pork than in those that sold only pork, suggesting that cross contamination occurred from the organs to pork. Among the 255 which tested positive for LAMPSS, only 47 samples tested positive for the previously described LAMP specific for S. suis serotype 2. Two isolates of S. suis serotype 2, belonging to sequence type 28, which is potentially hazardous to humans, as well as those of some other serotypes were obtained from 19 out of 47 samples by combining LAMP with a replica plating method. These results suggest that LAMPSS will be a useful tool for the surveillance of raw pork meat in the retail market.
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Affiliation(s)
- Sakura Arai
- Research Center for Food Safety, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Mari Tohya
- Research Center for Food Safety, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Ryoko Yamada
- Research Center for Food Safety, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Ro Osawa
- Department of Bioresource Sciences, Graduate School of Agricultural Sciences, Kobe University, Rokko-dai 1-1, Nada-ku, Kobe, Hyogo 657-8501, Japan
| | - Ryohei Nomoto
- Organization for Advanced Science and Technology, Kobe University, Rokko-dai 1-1, Nada-ku, Kobe, Hyogo 657-8501, Japan
| | - Yoshiaki Kawamura
- Department of Microbiology, Aichi Gakuin University, School of Pharmacy, 1-100 Kusumoto-cho, Nagoya, Aichi 464-8650, Japan
| | - Tsutomu Sekizaki
- Research Center for Food Safety, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan.
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28
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Molecular Basis of Resistance to Selected Antimicrobial Agents in the Emerging Zoonotic Pathogen Streptococcus suis. J Clin Microbiol 2015; 53:2332-6. [PMID: 25903569 DOI: 10.1128/jcm.00123-15] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2015] [Accepted: 04/11/2015] [Indexed: 11/20/2022] Open
Abstract
Characterization of 227 Streptococcus suis strains isolated from pigs during 2010 to 2013 showed high levels of resistance to clindamycin (95.6%), tilmicosin (94.7%), tylosin (93.8%), oxytetracycline (89.4%), chlortetracycline (86.8%), tiamulin (72.7%), neomycin (70.0%), enrofloxacin (56.4%), penicillin (56.4%), ceftiofur (55.9%), and gentamicin (55.1%). Resistance to tetracyclines, macrolides, aminoglycosides, and fluoroquinolone was attributed to the tet gene, erm(B), erm(C), mph(C), and mef(A) and/or mef(E) genes, aph(3')-IIIa and aac(6')-Ie-aph(2″)-Ia genes, and single point mutations in the quinolone resistance-determining region of ParC and GyrA, respectively.
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29
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Segura M, Zheng H, de Greeff A, Gao GF, Grenier D, Jiang Y, Lu C, Maskell D, Oishi K, Okura M, Osawa R, Schultsz C, Schwerk C, Sekizaki T, Smith H, Srimanote P, Takamatsu D, Tang J, Tenenbaum T, Tharavichitkul P, Hoa NT, Valentin-Weigand P, Wells JM, Wertheim H, Zhu B, Xu J, Gottschalk M. Latest developments on Streptococcus suis: an emerging zoonotic pathogen: part 2. Future Microbiol 2015; 9:587-91. [PMID: 24957086 DOI: 10.2217/fmb.14.15] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
First International Workshop on Streptococcus suis, Beijing, China, 12-13 August 2013. This second and final chapter of the report on the First International Workshop on Streptococcus suis follows on from Part 1, published in the April 2014, volume 9, issue 4 of Future Microbiology. S. suis is a swine pathogen and a zoonotic agent afflicting people in close contact with infected pigs or pork meat. Although sporadic cases of human infections had been reported worldwide, deadly S. suis outbreaks emerged in Asia. The severity of the disease underscores the lack of knowledge on the virulence and zoonotic evolution of this human-infecting agent. The pathogenesis of the infection, interactions with host cells and new avenues for treatments were among the topics discussed during the First International Workshop on S. suis (China 2013).
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Affiliation(s)
- Mariela Segura
- Faculty of Veterinary Medicine, University of Montreal, Canada
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30
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Streptococcus suis, an important pig pathogen and emerging zoonotic agent-an update on the worldwide distribution based on serotyping and sequence typing. Emerg Microbes Infect 2014; 3:e45. [PMID: 26038745 PMCID: PMC4078792 DOI: 10.1038/emi.2014.45] [Citation(s) in RCA: 447] [Impact Index Per Article: 44.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2014] [Revised: 04/22/2014] [Accepted: 04/23/2014] [Indexed: 12/18/2022]
Abstract
Streptococcus suis is an important pathogen causing economic problems in the pig
industry. Moreover, it is a zoonotic agent causing severe infections to people in close
contact with infected pigs or pork-derived products. Although considered sporadic in the
past, human S. suis infections have been reported during the last 45 years, with
two large outbreaks recorded in China. In fact, the number of reported human cases has
significantly increased in recent years. In this review, we present the worldwide
distribution of serotypes and sequence types (STs), as determined by multilocus sequence
typing, for pigs (between 2002 and 2013) and humans (between 1968 and 2013). The methods
employed for S. suis identification and typing, the current epidemiological
knowledge regarding serotypes and STs and the zoonotic potential of S. suis are
discussed. Increased awareness of S. suis in both human and veterinary diagnostic
laboratories and further establishment of typing methods will contribute to our knowledge
of this pathogen, especially in regions where complete and/or recent data is lacking. More
research is required to understand differences in virulence that occur among S.
suis strains and if these differences can be associated with specific serotypes or
STs.
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31
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32
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Streptococcus suis-related prosthetic joint infection and streptococcal toxic shock-like syndrome in a pig farmer in the United States. J Clin Microbiol 2014; 52:2254-8. [PMID: 24719433 DOI: 10.1128/jcm.02934-13] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Streptococcus suis is an emerging swine-associated zoonotic agent that can cause meningitis and septicemia in humans. We present, to our knowledge, the first case of S. suis arthroplasty infection and streptococcal toxic shock-like syndrome due to an nonencapsulated serotype 5 strain in North America.
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33
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Lakkitjaroen N, Takamatsu D, Okura M, Sato M, Osaki M, Sekizaki T. Capsule loss or death: The position of mutations among capsule genes sways the destiny ofStreptococcus suis. FEMS Microbiol Lett 2014; 354:46-54. [DOI: 10.1111/1574-6968.12428] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2014] [Revised: 03/12/2014] [Accepted: 03/12/2014] [Indexed: 11/30/2022] Open
Affiliation(s)
- Nattakan Lakkitjaroen
- Research Center for Food Safety; Graduate School of Agricultural and Life Sciences; The University of Tokyo; Tokyo Japan
| | - Daisuke Takamatsu
- Bacterial and Parasitic Diseases Research Division; National Institute of Animal Health; National Agriculture and Food Research Organization; Tsukuba Ibaraki Japan
- The United Graduate School of Veterinary Sciences; Gifu University; Gifu Japan
| | - Masatoshi Okura
- Bacterial and Parasitic Diseases Research Division; National Institute of Animal Health; National Agriculture and Food Research Organization; Tsukuba Ibaraki Japan
| | - Masumi Sato
- Epidemiological Information Section; National Institute of Animal Health; National Agriculture and Food Research Organization; Tsukuba Ibaraki Japan
| | - Makoto Osaki
- Bacterial and Parasitic Diseases Research Division; National Institute of Animal Health; National Agriculture and Food Research Organization; Tsukuba Ibaraki Japan
| | - Tsutomu Sekizaki
- Research Center for Food Safety; Graduate School of Agricultural and Life Sciences; The University of Tokyo; Tokyo Japan
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34
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Kerdsin A, Akeda Y, Hatrongjit R, Detchawna U, Sekizaki T, Hamada S, Gottschalk M, Oishi K. Streptococcus suis serotyping by a new multiplex PCR. J Med Microbiol 2014; 63:824-830. [PMID: 24696517 DOI: 10.1099/jmm.0.069757-0] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
A multiplex PCR was developed to detect all true serotypes of Streptococcus suis. This multiplex PCR was composed of four reaction sets. The first set identified nine serotypes (serotypes 1/2, 1, 2, 3, 7, 9, 11, 14 and 16), the second set identified eight serotypes (serotypes 4, 5, 8, 12, 18, 19, 24 and 25), the third set identified seven serotypes (serotypes 6, 10, 13, 15, 17, 23 and 31), and the last set identified five serotypes (serotypes 21, 27, 28, 29 and 30). This assay correctly detected serotypes 2, 5, 14 and 24 in human isolates, and serotypes 1, 2, 1/2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 14, 15, 16, 17, 19, 24, 28 and 31 in pig isolates from Thailand. No cross-reaction was observed with other bacterial species. Our multiplex PCR was able to simultaneously amplify a DNA mixture of reference Streptococcus suis serotypes. This assay should be useful for serotype surveillance of human and pig isolates of Streptococcus suis.
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Affiliation(s)
- Anusak Kerdsin
- National Institute of Health, Department of Medical Sciences, Ministry of Public Health, Nonthaburi, Thailand
| | - Yukihiro Akeda
- Laboratory of Clinical Research on Infectious Diseases, International Research Center for Infectious Diseases, Research Institute for Microbial Diseases, Osaka University, Osaka, Japan
| | - Rujirat Hatrongjit
- Faculty of Science and Engineering, Kasetsart University, Chalermphrakiat Sakon Nakhon Province Campus, Sakon Nakhon, Thailand
| | - Unchaya Detchawna
- National Institute of Health, Department of Medical Sciences, Ministry of Public Health, Nonthaburi, Thailand
| | - Tsutomu Sekizaki
- Research Center for Food Safety, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan
| | - Shigeyuki Hamada
- Thailand-Japan Research Collaboration Center for Emerging and Re-emerging Infections, Research Institute for Microbial Diseases, Osaka University, Osaka, Japan
| | | | - Kazunori Oishi
- Infectious Disease Surveillance Center, National Institute of Infectious Diseases, Tokyo, Japan
- Laboratory of Clinical Research on Infectious Diseases, International Research Center for Infectious Diseases, Research Institute for Microbial Diseases, Osaka University, Osaka, Japan
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35
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Development of a two-step multiplex PCR assay for typing of capsular polysaccharide synthesis gene clusters of Streptococcus suis. J Clin Microbiol 2014; 52:1714-9. [PMID: 24574288 DOI: 10.1128/jcm.03411-13] [Citation(s) in RCA: 76] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
We developed a practical and easy two-step multiplex PCR assay to aid in serotyping of Streptococcus suis. The assay accurately typed almost all of the serotype reference strains and field isolates of various serotypes and also identified the genotypes of capsular polysaccharide synthesis gene clusters of some serologically nontypeable strains.
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36
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Characterization and proteome analysis of inosine 5-monophosphate dehydrogenase in epidemic Streptococcus suis serotype 2. Curr Microbiol 2014; 68:663-9. [PMID: 24458764 DOI: 10.1007/s00284-014-0527-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2013] [Accepted: 11/26/2013] [Indexed: 10/25/2022]
Abstract
Streptococcus suis serotype 2 (SS2) is an important zoonotic pathogen that causes severe disease symptoms in pigs and humans. In the present study, we found one isogenic mutant lacking inosine 5-monophosphate dehydrogenase (IMPDH) ΔZY05719 was attenuated in pigs compared with the wild-type SS2 strain ZY05719. Comparative proteome analysis of the secreted proteins expression profiles between ZY05719 and ΔZY05719 allowed us to identify Triosephosphate isomerase (TPI) and glyceraldehyde phosphate dehydrogenase (GAPDH), which were down expressed in the absence of the IMPDH. Both of them are glycolytic enzymes participating in the glycolytic pathway. Compared with ZY05719, ΔZY05719 lost the ability of utilize mannose, which might relate to down expression of TPI and GAPDH. In addition, GAPDH is a well-known factor that involved in adhesion to host cells, and we demonstrated ability of adhesion to HEp-2 and PK15 by ΔZY05719 was significantly weakened, in contrast to ZY05719. The adhesion to host cells is the crucial step to cause infection for pathogen, and the reduction adhesion of ΔZY05719, to some extent illustrates the attenuated virulence of ΔZY05719.
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37
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Gottschalk M, Lacouture S, Bonifait L, Roy D, Fittipaldi N, Grenier D. Characterization of Streptococcus suis isolates recovered between 2008 and 2011 from diseased pigs in Québec, Canada. Vet Microbiol 2012. [PMID: 23177911 DOI: 10.1016/j.vetmic.2012.10.028] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In the present study we report the distribution of different serotypes of Streptococcus suis among strains isolated from diseased pigs in Québec, Canada, recovered between 2008 and 2011. Serotype 2 strains were further studied for the presence of the following virulence markers: suilysin (sly), muramidase-released protein (MRP), extracellular protein factor (epf) and the pilus encoded by the srtF cluster. Of 1004 field strains collected, 986 were confirmed to be S. suis by either the species-specific PCR targeting the gdh gene or by 16S rRNA gene sequencing analysis. Results showed that, although widely used, the species-specific PCR test can sometimes be misleading and fail to correctly identify some S. suis isolates. Serotypes 2, 3, 1/2, 4, 8 and 22 together represented 51% of S. suis strains (64.5% of typable strains). Results confirmed the relatively low prevalence of serotype 2 in North America, when compared to European and Asian countries. The vast majority of serotype 2 field strains (96%) belong to either the MRP(+), srtF pilus(+), epf(-), sly(-) (52%) or the MRP(-), srtF pilus(-), epf(-), sly(-) phenotypes (44%). Most non-typable strains (89%) presented high surface hydrophobicity, suggesting that these are poorly or non-encapsulated. Electron microscopy studies confirmed the lack of capsular polysaccharide in selected non-typable high hydrophobic strains. The role and pathogenesis of the infection caused by these strains remain to be elucidated.
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Affiliation(s)
- Marcelo Gottschalk
- Groupe de Recherche sur les Maladies Infectieuses du Porc, Faculté de Médecine Vétérinaire, Université de Montréal, 3200 Sicotte, St.-Hyacinthe, Québec, J2S 2M2, Canada.
| | - Sonia Lacouture
- Groupe de Recherche sur les Maladies Infectieuses du Porc, Faculté de Médecine Vétérinaire, Université de Montréal, 3200 Sicotte, St.-Hyacinthe, Québec, J2S 2M2, Canada
| | - Laetitia Bonifait
- Groupe de Recherche en Écologie Buccale (GREB), Faculté de Médecine Dentaire, Université Laval, Québec City, Québec, G1V 0A6, Canada
| | - David Roy
- Groupe de Recherche sur les Maladies Infectieuses du Porc, Faculté de Médecine Vétérinaire, Université de Montréal, 3200 Sicotte, St.-Hyacinthe, Québec, J2S 2M2, Canada
| | - Nahuel Fittipaldi
- Public Health Ontario, 81 Resources Road, Toronto, Ontario, M9P 3T1, Canada
| | - Daniel Grenier
- Groupe de Recherche en Écologie Buccale (GREB), Faculté de Médecine Dentaire, Université Laval, Québec City, Québec, G1V 0A6, Canada
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Onishi H, Sugawara M, Okura M, Osaki M, Takamatsu D. Prevalence of Streptococcus suis genotypes in isolates from porcine endocarditis in East Japan. J Vet Med Sci 2012; 74:1681-4. [PMID: 22878504 DOI: 10.1292/jvms.12-0301] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Streptococcus suis is an important pathogen for both swine and humans. In this study, we genotyped 105 S. suis isolates from porcine endocarditis in East Japan on the basis of profiles of capsular serotype-specific, virulence-associated and pilus-associated genes. The most common genotype was cps2J/mrp+/epf-/sly-/sbp2-/sep1-/sgp1+ (76.19%), followed by nt(non-typeable)/mrp+/epf-/sly-/sbp2-/sep1-/sgp1+ (7.62%) and cps2J/mrp+/epf+/sly+/sbp2+/sep1-/sgp1- (7.62%). The representative isolates of mrp+/epf-/sly-/sbp2-/sep1-/sgp1+ were classified into ST28 complex, a clonal complex previously referred to as ST27 complex, whereas those of mrp+/epf+/sly+/sbp2+/sep1-/sgp1- were classified into ST1 complex by multilocus sequence typing. Because the majority of human clinical isolates were assigned to ST1 and ST28 complexes, most isolates from porcine endocarditis investigated in this study may have the potential to cause S. suis infection in humans.
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Affiliation(s)
- Hidetaka Onishi
- Fukushima Prefectural Kenchu Livestock Hygiene Service Center, 2 Mansuida, Koriyama, Fukushima 963-8041, Japan
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Fittipaldi N, Segura M, Grenier D, Gottschalk M. Virulence factors involved in the pathogenesis of the infection caused by the swine pathogen and zoonotic agent Streptococcus suis. Future Microbiol 2012; 7:259-79. [PMID: 22324994 DOI: 10.2217/fmb.11.149] [Citation(s) in RCA: 311] [Impact Index Per Article: 25.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
Streptococcus suis is a major swine pathogen responsible for important economic losses to the swine industry worldwide. It is also an emerging zoonotic agent of meningitis and streptococcal toxic shock-like syndrome. Since the recent recognition of the high prevalence of S. suis human disease in southeast and east Asia, the interest of the scientific community in this pathogen has significantly increased. In the last few years, as a direct consequence of these intensified research efforts, large amounts of data on putative virulence factors have appeared in the literature. Although the presence of some proposed virulence factors does not necessarily define a S. suis strain as being virulent, several cell-associated or secreted factors are clearly important for the pathogenesis of the S. suis infection. In order to cause disease, S. suis must colonize the host, breach epithelial barriers, reach and survive in the bloodstream, invade different organs, and cause exaggerated inflammation. In this review, we discuss the potential contribution of different described S. suis virulence factors at each step of the pathogenesis of the infection. Finally, we briefly discuss other described virulence factors, virulence factor candidates and virulence markers for which a precise role at specific steps of the pathogenesis of the S. suis infection has not yet been clearly established.
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Affiliation(s)
- Nahuel Fittipaldi
- Groupe de Recherche sur les Maladies Infectieuses du Porc & Centre de Recherche en Infectiologie Porcine, Faculté de médecine vétérinaire, Université de Montréal, 3200 rue Sicotte, CP5000, St-Hyacinthe, Quebec, J2S 7C6, Canada
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