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Lee Y, Bae HG, Won D, Yun W, Lee H, Choi JR, Uh Y, Lee K. Comparative Analysis of the Molecular Characteristics of Group B Streptococcus Isolates Collected from Pregnant Korean Women Using Whole-genome Sequencing. Ann Lab Med 2023; 43:180-186. [PMID: 36281512 PMCID: PMC9618906 DOI: 10.3343/alm.2023.43.2.180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2022] [Revised: 07/06/2022] [Accepted: 09/14/2022] [Indexed: 12/27/2022] Open
Abstract
Background The incidence of early- and late-onset sepsis and meningitis in neonates due to maternal rectovaginal group B Streptococcus (GBS) colonization may differ with serotype distribution and clonal complex (CC). CC17 strains are associated with hypervirulence and poor disease outcomes. GBS serotypes are distinguished based on the polysaccharide capsule, the most important virulence factor. We determined the sequence type distribution of GBS isolates from pregnant women in Korea and validated whole-genome sequencing (WGS)-based prediction of antimicrobial susceptibility and capsular serotypes in GBS isolates. Methods Seventy-five GBS isolates collected from pregnant Korean women visiting Wonju Severance Christian Hospital, Wonju, Korea between 2017 and 2019 were subjected to WGS using the NovaSeq 6000 system (Illumina, San Diego, CA, USA). Multilocus sequence types, serotypes, antimicrobial resistance genes, and hemolysin operon mutations were determined by WGS, and the latter three were compared with the results of conventional phenotypic methods. Results The predominant lineage was CC1 (37.3%), followed by CC19 (32.0%), CC12 (17.3%), and CC17 (4.0%). All isolates were cps typeable (100%, (75/75), and 89.3% of cps genotypes (67/75) were concordant with serotypes obtained using latex agglutination. The cps genotypes of the 75 isolates were serotypes III (24.0%), V (22.7%), and VIII (17.3%). All isolates harboring intact ermB and tet were non-susceptible to erythromycin and tetracycline, respectively. Three non-hemolytic strains had 1-bp frameshift insertions in cylE. Conclusions The low prevalence of CC17 GBS colonization may explain the low frequency of neonatal GBS infections. WGS is a useful tool for simultaneous genotyping and antimicrobial resistance determination.
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Affiliation(s)
- Yangsoon Lee
- Department of Laboratory Medicine, Hanyang University College of Medicine, Seoul, Korea
| | | | - Dongju Won
- Department of Laboratory Medicine and Research Institute of Bacterial Resistance, Yonsei University College of Medicine, Seoul, Korea
| | - Woobin Yun
- Department of Laboratory Medicine, Graduate School of Medical Sciences, Brain, Korea 21 Project, Yonsei University College of Medicine, Seoul, Korea
| | - Hyukmin Lee
- Department of Laboratory Medicine and Research Institute of Bacterial Resistance, Yonsei University College of Medicine, Seoul, Korea
| | - Jong Rak Choi
- Department of Laboratory Medicine and Research Institute of Bacterial Resistance, Yonsei University College of Medicine, Seoul, Korea
| | - Young Uh
- Department of Laboratory Medicine, Yonsei University Wonju College of Medicine, Wonju, Korea
| | - Kyungwon Lee
- Seoul Clinical Laboratories, Yongin, Korea.,Department of Laboratory Medicine and Research Institute of Bacterial Resistance, Yonsei University College of Medicine, Seoul, Korea
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Distribution and Prevalence of Serotypes of Group B Streptococcus Isolated from Pregnant Women in 30 Countries: A Systematic Review. MATERNAL-FETAL MEDICINE 2023. [DOI: 10.1097/fm9.0000000000000174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
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3
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Molecular Epidemiology of Group B Streptococcus Colonization in Egyptian Women. Microorganisms 2022; 11:microorganisms11010038. [PMID: 36677330 PMCID: PMC9861799 DOI: 10.3390/microorganisms11010038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2022] [Revised: 12/16/2022] [Accepted: 12/19/2022] [Indexed: 12/25/2022] Open
Abstract
(1) Background: Streptococcus agalactiae or Group B Streptococcus (GBS) causes severe neonatal infections with a high burden of disease, especially in Africa. Maternal vaginal colonization and perinatal transmissions represent the common mode of acquiring the infection. Development of an effective maternal vaccine against GBS relies on molecular surveillance of the maternal GBS population to better understand the global distribution of GBS clones and serotypes. (2) Methods: Here, we present genomic data from a collection of colonizing GBS strains from Ismailia, Egypt that were sequenced and characterized within the global JUNO project. (3) Results: A large proportion of serotype VI, ST14 strains was discovered, a serotype which is rarely found in strain collections from the US and Europe and typically not included in the current vaccine formulations. (4) Conclusions: The molecular epidemiology of these strains clearly points to the African origin with the detection of several sequence types (STs) that have only been observed in Africa. Our data underline the importance of continuous molecular surveillance of the GBS population for future vaccine implementations.
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Kam KQ, Thoon KC, Tee WSN, Ang MLT, Tan NWH, Yeo KT, Li J, Chong CY. Serotype distribution and incidence of invasive early onset and late onset group B streptococcal disease amongst infants in Singapore. BMC Infect Dis 2021; 21:1221. [PMID: 34876053 PMCID: PMC8650237 DOI: 10.1186/s12879-021-06891-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2020] [Accepted: 11/22/2021] [Indexed: 11/16/2022] Open
Abstract
Background The current group B streptococcal (GBS) preventive measures had reduced invasive GBS early onset disease (EOD) incidences worldwide, but the late onset disease (LOD) incidences had remained unchanged. Administration of a safe and effective GBS vaccine in addition to the current strategies were thought to be the next steps in reducing the incidences of invasive GBS infection especially LOD. In this study, we aimed to examine the causative GBS serotypes in invasive GBS disease, determine the incidences of EOD and LOD, and compare the risk factors between EOD and LOD. Methods A retrospective study of infants ≤ 90-day-old over an 8-year period (2010–2017). The incidences of EOD and LOD were obtained by using patients with EOD and LOD who were born in our institution as the numerator and the live births in our institution per year of the study period as the denominator. Available GBS isolates were serotyped by the National Public Health Laboratory using capsular serotyping methods. The risk factors of EOD and LOD were compared. Results A total of 71 infants were identified; 16 (22.5%) and 55 (77.5%) of them had EOD and LOD, respectively. Serotype III (n = 42, 71.2%) was the most common serotype amongst the 59 isolates available for serotyping. Serotypes Ia, Ib, II, III, and V accounted for 98.3% (n = 58) of the invasive GBS diseases. The overall incidence was 0.42 per 1000 live births. The mean incidences of EOD and LOD were 0.13 per 1000 live births and 0.29 per 1000 live births, respectively. On multivariate analysis, risk factors for LOD as compared to EOD were: Chinese ethnicity (OR 27.1, 95% CI 3.0–243.1, p = 0.003) and negative/unknown maternal GBS status (OR 20.0, 95% CI 2.0–250.0, p = 0.012). Prematurity and intrapartum risk factors (peripartum maternal pyrexia, prolonged rupture of membrane) of EOD were not associated with LOD. Conclusions The LOD incidence had remained higher than EOD incidence in our cohort. A GBS vaccine that covers the major causative serotypes found in our cohort can potentially reduce the overall GBS disease burden in the country.
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Affiliation(s)
- Kai-Qian Kam
- Infectious Disease Service, Department of Pediatrics, KK Women's and Children's Hospital, 100 Bukit Timah, Singapore City, 229899, Singapore. .,Yong Loo Lin School of Medicine, National University of Singapore, Singapore City, Singapore. .,Duke-National University of Singapore Medical School, Singapore City, Singapore. .,Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore City, Singapore.
| | - Koh Cheng Thoon
- Infectious Disease Service, Department of Pediatrics, KK Women's and Children's Hospital, 100 Bukit Timah, Singapore City, 229899, Singapore.,Yong Loo Lin School of Medicine, National University of Singapore, Singapore City, Singapore.,Duke-National University of Singapore Medical School, Singapore City, Singapore.,Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore City, Singapore
| | - Wen Sim Nancy Tee
- Department of Laboratory Medicine, National University Health System, Singapore City, Singapore
| | - Michelle Lay Teng Ang
- National Public Health Laboratory, National Centre of Infectious Diseases, Singapore City, Singapore
| | - Natalie Woon Hui Tan
- Infectious Disease Service, Department of Pediatrics, KK Women's and Children's Hospital, 100 Bukit Timah, Singapore City, 229899, Singapore.,Yong Loo Lin School of Medicine, National University of Singapore, Singapore City, Singapore.,Duke-National University of Singapore Medical School, Singapore City, Singapore.,Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore City, Singapore
| | - Kee Thai Yeo
- Yong Loo Lin School of Medicine, National University of Singapore, Singapore City, Singapore.,Duke-National University of Singapore Medical School, Singapore City, Singapore.,Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore City, Singapore.,Department of Neonatology, KK Women's and Children's Hospital, Singapore City, Singapore
| | - Jiahui Li
- Infectious Disease Service, Department of Pediatrics, KK Women's and Children's Hospital, 100 Bukit Timah, Singapore City, 229899, Singapore.,Yong Loo Lin School of Medicine, National University of Singapore, Singapore City, Singapore.,Duke-National University of Singapore Medical School, Singapore City, Singapore.,Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore City, Singapore
| | - Chia Yin Chong
- Infectious Disease Service, Department of Pediatrics, KK Women's and Children's Hospital, 100 Bukit Timah, Singapore City, 229899, Singapore.,Yong Loo Lin School of Medicine, National University of Singapore, Singapore City, Singapore.,Duke-National University of Singapore Medical School, Singapore City, Singapore.,Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore City, Singapore
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5
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Hsu JF, Tsai MH, Lin LC, Chu SM, Lai MY, Huang HR, Chiang MC, Yang PH, Lu JJ. Genomic Characterization of Serotype III/ST-17 Group B Streptococcus Strains with Antimicrobial Resistance Using Whole Genome Sequencing. Biomedicines 2021; 9:biomedicines9101477. [PMID: 34680594 PMCID: PMC8533585 DOI: 10.3390/biomedicines9101477] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2021] [Revised: 10/11/2021] [Accepted: 10/12/2021] [Indexed: 12/25/2022] Open
Abstract
Background: Antibiotic-resistant type III/ST-17 Streptococcus agalactiae (group B Streptococcus, GBS) strain is predominant in neonatal invasive GBS diseases. We aimed to investigate the antibiotic resistance profiles and genetic characteristics of type III/ST-17 GBS strains. Methods: A total of 681 non-duplicate GBS isolates were typed (MLST, capsular types) and their antibiotic resistances were performed. Several molecular methods (WGS, PCR, sequencing and sequence analysis) were used to determine the genetic context of antibiotic resistant genes and pili genes. Results: The antibiotic resistant rates were significantly higher in type Ib (90.1%) and type III (71.1%) GBS isolates. WGS revealed that the loss of PI-1 genes and absence of ISSag5 was found in antibiotic-resistant III/ST-17 GBS isolates, which is replaced by a ~75-kb integrative and conjugative element, ICESag37, comprising multiple antibiotic resistance and virulence genes. Among 190 serotype III GBS isolates, the most common pilus island was PI-2b (58.4%) alone, which was found in 81.3% of the III/ST-17 GBS isolates. Loss of PI-1 and ISSag5 was significantly associated with antibiotic resistance (95.5% vs. 27.8%, p < 0.001). The presence of ICESag37 was found in 83.6% of all III/ST-17 GBS isolates and 99.1% (105/106) of the antibiotic-resistant III/ST-17 GBS isolates. Conclusions: Loss of PI-1 and ISSag5, which is replaced by ICESag37 carrying multiple antibiotic resistance genes, accounts for the high antibiotic resistance rate in III/ST-17 GBS isolates. The emerging clonal expansion of this hypervirulent strain with antibiotic resistance after acquisition of ICESag37 highlights the urgent need for continuous surveillance of GBS infections.
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Affiliation(s)
- Jen-Fu Hsu
- Division of Pediatric Neonatology, Department of Pediatrics, Chang Gung Memorial Hospital, Taoyuan 333, Taiwan; (J.-F.H.); (S.-M.C.); (M.-Y.L.); (H.-R.H.); (M.-C.C.); (P.-H.Y.)
- College of Medicine, Chang Gung University, Taoyuan 333, Taiwan;
| | - Ming-Horng Tsai
- College of Medicine, Chang Gung University, Taoyuan 333, Taiwan;
- Division of Neonatology and Pediatric Hematology/Oncology, Department of Pediatrics, Chang Gung Memorial Hospital, Taoyuan 638, Taiwan
| | - Lee-Chung Lin
- Department of Laboratory Medicine, Chang Gung Memorial Hospital at Linkou, Taoyuan 333, Taiwan;
| | - Shih-Ming Chu
- Division of Pediatric Neonatology, Department of Pediatrics, Chang Gung Memorial Hospital, Taoyuan 333, Taiwan; (J.-F.H.); (S.-M.C.); (M.-Y.L.); (H.-R.H.); (M.-C.C.); (P.-H.Y.)
- College of Medicine, Chang Gung University, Taoyuan 333, Taiwan;
| | - Mei-Yin Lai
- Division of Pediatric Neonatology, Department of Pediatrics, Chang Gung Memorial Hospital, Taoyuan 333, Taiwan; (J.-F.H.); (S.-M.C.); (M.-Y.L.); (H.-R.H.); (M.-C.C.); (P.-H.Y.)
- College of Medicine, Chang Gung University, Taoyuan 333, Taiwan;
| | - Hsuan-Rong Huang
- Division of Pediatric Neonatology, Department of Pediatrics, Chang Gung Memorial Hospital, Taoyuan 333, Taiwan; (J.-F.H.); (S.-M.C.); (M.-Y.L.); (H.-R.H.); (M.-C.C.); (P.-H.Y.)
- College of Medicine, Chang Gung University, Taoyuan 333, Taiwan;
| | - Ming-Chou Chiang
- Division of Pediatric Neonatology, Department of Pediatrics, Chang Gung Memorial Hospital, Taoyuan 333, Taiwan; (J.-F.H.); (S.-M.C.); (M.-Y.L.); (H.-R.H.); (M.-C.C.); (P.-H.Y.)
- College of Medicine, Chang Gung University, Taoyuan 333, Taiwan;
| | - Peng-Hong Yang
- Division of Pediatric Neonatology, Department of Pediatrics, Chang Gung Memorial Hospital, Taoyuan 333, Taiwan; (J.-F.H.); (S.-M.C.); (M.-Y.L.); (H.-R.H.); (M.-C.C.); (P.-H.Y.)
- College of Medicine, Chang Gung University, Taoyuan 333, Taiwan;
| | - Jang-Jih Lu
- College of Medicine, Chang Gung University, Taoyuan 333, Taiwan;
- Department of Laboratory Medicine, Chang Gung Memorial Hospital at Linkou, Taoyuan 333, Taiwan;
- Department of Medical Biotechnology and Laboratory Science, Chang Gung University, Taoyuan 333, Taiwan
- Correspondence: ; Tel.: +886-3-328-1200 (ext. 2554); Fax: +886-3-397-1827
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Tulyaprawat O, Pharkjaksu S, Shrestha RK, Ngamskulrungroj P. Emergence of Multi-Drug Resistance and Its Association With Uncommon Serotypes of Streptococcus agalactiae Isolated From Non-neonatal Patients in Thailand. Front Microbiol 2021; 12:719353. [PMID: 34566923 PMCID: PMC8456118 DOI: 10.3389/fmicb.2021.719353] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2021] [Accepted: 08/19/2021] [Indexed: 11/13/2022] Open
Abstract
Group B streptococcus (GBS) or Streptococcus agalactiae is an opportunistic pathogen that causes serious illness in newborns, pregnant women, and adults. However, insufficient detection methods and disease prevention programs have contributed to an increase in the incidence and fatality rates associated with this pathogen in non-neonatal patients. This study aimed to investigate factors of the observed increased incidence by investigation of serotype distribution, virulence factors, and antimicrobial susceptibility patterns from invasive GBS disease among non-neonatal patients in Thailand. During 2017–2018, a total of 109 S. agalactiae isolates were collected from non-pregnant patients. There were 62 males and 47 females, with an average age of 63.5 years (range: 20 – 96). Serotypes were determined by latex agglutination assay and multiplex polymerase chain reaction (PCR)-based assay. Among those isolates, seven virulence genes (rib, bca, pavA, lmb, scpB, cylE, and cfb) were detected by PCR amplification, and were determined for their susceptibility to 20 antimicrobial agents using a SensititreTM Streptococcus species STP6F AST plate. Among the study isolates, serotype III was predominant (52.3%), followed by serotype V and serotype VI (13.8% for each), serotype Ib (11.9%), and other serotypes (8.2%). Of the seven virulence genes, pavA was found in 67.0%. Except for one, there were no significant differences in virulence genes between serotype III and non-serotype III. Study isolates showed an overall rate of non-susceptibility to penicillin, the first-line antibiotic, of only 0.9%, whereas the resistance rates measured in tetracycline, clindamycin, azithromycin, and erythromycin were 41.3, 22.0, 22.0, and 22.0%, respectively. Strains that were resistant to all four of those drugs were significantly associated with non-serotype III (p < 0.001). Using multi-locus sequence typing (MLST), 40.0% of the four-drug-resistant isolates belonged to serotype VI/ST1, followed by serotype Ib/ST1 (35.0%). Cluster analysis with global GBS isolates suggested that the multiple drug-resistant isolates to be strongly associated with the clonal complex (CC) 1 (p < 0.001). Compared to the 2014 study of 210 invasive GBS isolates conducted in 12 tertiary hospitals in Thailand, the proportion of serotype III has dramatically dropped from nearly 90% to about 50%. This suggests that resistances to the second-line antibiotics for GBS might be the selective pressure causing the high prevalence of non-serotype III isolates.
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Affiliation(s)
- Orawan Tulyaprawat
- Department of Microbiology, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
| | - Sujiraphong Pharkjaksu
- Department of Microbiology, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
| | - Raj Kumar Shrestha
- Department of Microbiology, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
| | - Popchai Ngamskulrungroj
- Department of Microbiology, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
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Zhang L, Kang WJ, Zhu L, Xu LJ, Guo C, Zhang XH, Liu QH, Ma L. Emergence of Invasive Serotype Ib Sequence Type 10 Group B Streptococcus Disease in Chinese Infants Is Driven by a Tetracycline-Sensitive Clone. Front Cell Infect Microbiol 2021; 11:642455. [PMID: 34055663 PMCID: PMC8162377 DOI: 10.3389/fcimb.2021.642455] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2021] [Accepted: 04/26/2021] [Indexed: 01/31/2023] Open
Abstract
Background Group B streptococcus (GBS) is a leading cause of serious infections in infants. The extensive use of tetracycline has led to the selection of specific resistant and infectious GBS clones. The sequence type (ST) 10 GBS strain, causing invasive infections in infants, is becoming prevalent in China. We aimed to understand the clinical and microbiological characteristics of this GBS strain. Methods We conducted a retrospective study on infants with invasive GBS disease from the largest women’s and children’s medical center in Shanxi and collected data between January 2017 and October 2020. GBS isolates were analyzed by capsule serotyping, genotyping, antibiotic resistance, and surface protein genes. Results All ST10 isolates belonged to serotype Ib; type Ib/ST10 strains were responsible for 66.7% (14/21, P < 0.05) of infant invasive GBS infections during the period and all resulted in late-onset (LOD) and late LOD disease (14/14). Infants with type Ib/ST10 GBS disease had significantly higher rates of meningitis (9/14, 64.3%, p < 0.05) and clinical complications (5/14, 35.7%, p < 0.05). The Ib/ST10 GBS isolates had limited genetic diversity, clustered in the CC10/bca/PI-1 + PI-2a genetic lineage, showed resistance to erythromycin, lincomycin, and fluoroquinolones and sensitivity to tetracycline, and possessed genes ermT, ermB, and amino acid changes in gyrA and parC. Conclusions The probable clonal expansion can result in severe infections in infants and ongoing emergence of multi-drug resistant isolates. Continued monitoring for type Ib/ST10 GBS infections is warranted.
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Affiliation(s)
- Li Zhang
- Department of Clinical Laboratory, Shanxi Children's Hospital Shanxi Maternal and Child Health Hospital, Taiyuan, China
| | - Wen-Juan Kang
- Department of Clinical Laboratory, Shanxi Children's Hospital Shanxi Maternal and Child Health Hospital, Taiyuan, China
| | - Lei Zhu
- Department of Clinical Laboratory, Shanxi Children's Hospital Shanxi Maternal and Child Health Hospital, Taiyuan, China
| | - Li-Jun Xu
- Department of Clinical Laboratory, Shanxi Children's Hospital Shanxi Maternal and Child Health Hospital, Taiyuan, China
| | - Chao Guo
- Department of Clinical Laboratory, Shanxi Children's Hospital Shanxi Maternal and Child Health Hospital, Taiyuan, China
| | - Xin-Hua Zhang
- Department of Neonatology Department, Shanxi Children's Hospital Shanxi Maternal and Child Health Hospital, Taiyuan, China
| | - Qing-Hua Liu
- Department of Pathophysiology, Shanxi Medical University, Taiyuan, China
| | - Lan Ma
- Department of Clinical Laboratory, Shanxi Children's Hospital Shanxi Maternal and Child Health Hospital, Taiyuan, China
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8
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Motallebirad T, Fazeli H, Jalalifar S, Shokri D, Moghim S, Nasr Esfahani B. Molecular Characterization of Hospital- and Community-Acquired Streptococcus agalactiae Isolates among Nonpregnant Adults in Isfahan, Iran. Adv Biomed Res 2021; 9:44. [PMID: 33457327 PMCID: PMC7792884 DOI: 10.4103/abr.abr_25_20] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2020] [Revised: 05/30/2020] [Accepted: 06/28/2020] [Indexed: 11/14/2022] Open
Abstract
Background: The increasing incidence of Group B Streptococcus (GBS) infection among nonpregnant adults has become of growing clinical and public health concern. The current study investigated the distribution of important virulence determinants and antibiotic susceptibility of GBS isolates causing community acquired (CA) and hospital acquired (HA) infections among nonpregnant adults. Materials and Methods: A total of 62 GBS, including 31 CA GBS and 31 HA GBS, were collected from a teaching hospital in Isfahan, Iran. Capsular polysaccharide genotypes (CPS), PI 1, PI 2a, PI 2b, and hypervirulent GBS adhesin (hvgA) virulence genes and antibiotic resistance profiling were determined. Results: There were 19 (30.6%) cases of underlying disease that diabetes mellitus (20.9%) was most common. The rate of multidrug resistant GBS strains was accounted for 29%. Distribution of macrolide resistant phenotypes was as follows: constitutive macrolides, lincosamides, and streptogramin B (MLSB) (15 isolates); inducible resistance to MLSB; and L phenotype (each 5 isolates) and M phenotype (1 isolate). V and Ia serotypes were the most predominant capsular type in HA GBS and CA GBS isolates, respectively. The most frequent pilus types were PI 1, PI 1+PI 2a, PI 1+PI 2b, and PI 2a. PI 1 and PI 1+PI 2a had significantly different distributions between CA and HA GBS isolates. Three CA GBS isolates (9.6%) were positive for hvgA gene that belonged to clonal complex 17/sequence type 17/CPS III/PI 1+PI 2b lineage. Conclusion: There was a significant difference in the distribution of PIs among CA GBS and HA GBS isolates in our region.
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Affiliation(s)
- Tahereh Motallebirad
- Department of Bacteriology and Virology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Hossein Fazeli
- Department of Bacteriology and Virology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Saba Jalalifar
- Department of Bacteriology and Virology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Darioush Shokri
- Department of Microbiology, Faculty of Biological Sciences and Technology, Shahid Ashrafi Esfahani University, Isfahan, Iran
| | - Sharareh Moghim
- Department of Bacteriology and Virology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Bahram Nasr Esfahani
- Department of Bacteriology and Virology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
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9
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Hirai N, Kasahara K, Nakano R, Ogawa Y, Suzuki Y, Ogawa M, Hishiya N, Nakano A, Ichimura S, Yano H, Yoshikawa M. Clinical characteristics and molecular epidemiology of invasive Streptococcus agalactiae infections between 2007 and 2016 in Nara, Japan. PLoS One 2020; 15:e0240590. [PMID: 33075112 PMCID: PMC7571711 DOI: 10.1371/journal.pone.0240590] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2020] [Accepted: 09/30/2020] [Indexed: 11/25/2022] Open
Abstract
Invasive Streptococcus agalactiae (GBS) infections are increasingly common among neonates and the elderly. Therefore, GBS surveillance for better antibiotic treatment and prophylaxis strategies are needed. We retrospectively evaluated the clinical aspects of invasive infections and the phenotypic and genetic diversity of infectious isolates from Nara, Japan, collected between 2007 and 2016, by using information from hospital records. GBS strains collected from the blood and cerebrospinal fluid cultures were evaluated for capsular types, multi-locus sequence typing (MLST), antibiotic susceptibility, antibiotics resistance gene, and pulsed-field gel electrophoresis. Forty GBS isolates (10 from children and 30 from adults) were analyzed, and the distribution of molecular serotype and allelic profiles varied between children and adults. We found the rates of early-onset disease in neonates with birth complications to be higher than that of previous reports, indicating that there could be relevance between complications at birth and early-onset disease. Standard antibiotic prophylaxis strategies may need to be reconsidered in patients with birth complications. In adults, the mean age of the patients was 68 years (male: 63%). Primary bacteremia was the most common source of infection. In the neonates, six had early-onset diseases and four had late-onset diseases. The most frequently identified strains were molecular serotype Ia ST23 (40%) and molecular serotype Ib ST10 (20%) in children and molecular serotype Ib ST10 (17%), molecular serotype VI ST1 (13%), and molecular serotype V ST1 (13%) in adults. Levofloxacin-resistant molecular serotype Ib strains and molecular serotypes V and VI ST1 were common causes of GBS infection in adults but were rarely found in children. Furthermore, pulsed-field gel electrophoresis in our study showed that specific clone isolates, that tend to have antibiotics resistance were widespread horizontally for a decade. Continuous surveillance and molecular investigation are warranted to identify the transmission route and improve antibiotic treatment strategies.
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Affiliation(s)
- Nobuyasu Hirai
- Department of Pathogen, Infection and Immunity, Nara Medical University, Kashihara, Nara, Japan
- Center for Infectious Diseases, Nara Medical University, Kashihara, Nara, Japan
- Department of Microbiology and Infectious Diseases, Nara Medical University, Kashihara, Nara, Japan
| | - Kei Kasahara
- Center for Infectious Diseases, Nara Medical University, Kashihara, Nara, Japan
- * E-mail:
| | - Ryuichi Nakano
- Department of Microbiology and Infectious Diseases, Nara Medical University, Kashihara, Nara, Japan
| | - Yoshihiko Ogawa
- Center for Infectious Diseases, Nara Medical University, Kashihara, Nara, Japan
| | - Yuki Suzuki
- Department of Microbiology and Infectious Diseases, Nara Medical University, Kashihara, Nara, Japan
| | - Miho Ogawa
- BML Biomedical Laboratories R&D Center, Inc., Kawagoe, Saitama, Japan
| | - Naokuni Hishiya
- Department of Microbiology and Infectious Diseases, Nara Medical University, Kashihara, Nara, Japan
| | - Akiyo Nakano
- Department of Microbiology and Infectious Diseases, Nara Medical University, Kashihara, Nara, Japan
| | - Sadahiro Ichimura
- BML Biomedical Laboratories R&D Center, Inc., Kawagoe, Saitama, Japan
| | - Hisakazu Yano
- Department of Microbiology and Infectious Diseases, Nara Medical University, Kashihara, Nara, Japan
| | - Masahide Yoshikawa
- Department of Pathogen, Infection and Immunity, Nara Medical University, Kashihara, Nara, Japan
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10
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Genovese C, D'Angeli F, Di Salvatore V, Tempera G, Nicolosi D. Streptococcus agalactiae in pregnant women: serotype and antimicrobial susceptibility patterns over five years in Eastern Sicily (Italy). Eur J Clin Microbiol Infect Dis 2020; 39:2387-2396. [PMID: 32700131 PMCID: PMC7669783 DOI: 10.1007/s10096-020-03992-8] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Accepted: 07/15/2020] [Indexed: 12/14/2022]
Abstract
Streptococcus agalactiae (also known Group B Streptococcus or GBS) represents the main pathogen responsible for early- and late-onset infections in newborns. The present study aimed to determine the antimicrobial susceptibility pattern and the capsular serotypes of GBS isolated in Eastern Sicily over 5 years, from January 2015 to December 2019. A total of 3494 GBS were isolated from vaginal swabs of pregnant women (37–39 weeks), as recommended by the Centers for Disease Control and Prevention. Capsular polysaccharide’s typing of GBS was determined by a commercial latex agglutination test containing reagents to serotypes I–IX. The antimicrobial resistance pattern of GBS was determined through the disk diffusion method (Kirby-Bauer) and the double-disk diffusion test on Mueller-Hinton agar plates supplemented with 5% defibrinated sheep blood, according to the guidelines of the Clinical and Laboratory Standards Institute. Serotypes III (1218, 34.9%) and V (1069, 30.6%) were the prevalent colonizers, followed by not typable (570, 16.3%) and serotypes Ia (548, 15.7%), Ib (47, 1.3%), II (40, 1.1%), and IV (2, 0.1%). All 3494 clinical isolates were susceptible to cefditoren and vancomycin. Resistance to penicillin, ampicillin, levofloxacin, clindamycin, and erythromycin was observed in 6 (0.2%), 5 (0.1%), 161 (4.6%), 1090 (31.2%), and 1402 (40.1%) of the strains, respectively. Most of erythromycin-resistant GBS (1090/1402) showed the cMLSB phenotype, 276 the M phenotype, and 36 the iMLSB phenotype. Our findings revealed a higher prevalence of serotype III and a relevant resistance rate, among GBS strains, to the most frequently used antibiotics in antenatal screening.
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Affiliation(s)
- Carlo Genovese
- Department of Biomedical and Biotechnological Sciences, Section of Microbiology, University of Catania, Catania, 95123, Italy.,Nacture S.r.l, Spin-off University of Catania, Catania, 95123, Italy
| | - Floriana D'Angeli
- Department of Biomedical and Biotechnological Sciences, Section of Biochemistry, University of Catania, Catania, 95123, Italy. .,Department of Human Sciences and Quality of Life Promotion, San Raffaele Roma Open University, 00166, Rome, Italy.
| | - Valentina Di Salvatore
- Department of Biomedical and Biotechnological Sciences, Laboratory of Translational Oncology and Functional Genomics, Section of General and Clinical Pathology and Oncology, University of Catania, Catania, 95123, Italy
| | - Gianna Tempera
- Nacture S.r.l, Spin-off University of Catania, Catania, 95123, Italy
| | - Daria Nicolosi
- Department of Biomedical and Biotechnological Sciences, Section of Microbiology, University of Catania, Catania, 95123, Italy.,Nacture S.r.l, Spin-off University of Catania, Catania, 95123, Italy
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11
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Ezhumalai M, Muthanna A, Suhaili Z, Dzaraly ND, Amin-Nordin S, Amal MNA, Desa MNM. Multilocus Sequence Typing Analysis of Invasive and Non-Invasive Group B Streptococcus of Hospital Origin in Malaysia. Malays J Med Sci 2020; 27:134-138. [PMID: 32158353 PMCID: PMC7053542 DOI: 10.21315/mjms2020.27.1.14] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2019] [Accepted: 01/16/2020] [Indexed: 11/17/2022] Open
Abstract
The aim of this study was to study the genotype of a hospital collection of Group B Streptococcus (GBS) from invasive and non-invasive sites. Fifty-one pre-characterised human of GBS were re-identified and further analysed by multilocus sequence typing (MLST) in relation to previously published serotypes. Fifteen sequence types (ST) were found with ST1 being the most predominant. ST1 was also associated with majority of the invasive isolates. The genotypic distribution patterns of GBS in this study were largely in agreement with previous reports from other countries indicating the tendency of certain genotypes to prevail in human infection settings.
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Affiliation(s)
- Menagah Ezhumalai
- Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Selangor, Malaysia
| | - AbdulRahman Muthanna
- Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Selangor, Malaysia
| | - Zarizal Suhaili
- Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Selangor, Malaysia.,School of Animal Sciences, Faculty of Bioresources and Food Industry, Universiti Sultan Zainal Abidin, Terengganu, Malaysia
| | - Nurul Diana Dzaraly
- Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Selangor, Malaysia
| | - Syafinaz Amin-Nordin
- Department of Medical Microbiology and Parasitology, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Selangor, Malaysia
| | | | - Mohd Nasir Mohd Desa
- Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Selangor, Malaysia
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12
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Wang HY, Li WC, Huang KY, Chung CR, Horng JT, Hsu JF, Lu JJ, Lee TY. Rapid classification of group B Streptococcus serotypes based on matrix-assisted laser desorption ionization-time of flight mass spectrometry and machine learning techniques. BMC Bioinformatics 2019; 20:703. [PMID: 31870283 PMCID: PMC6929280 DOI: 10.1186/s12859-019-3282-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2019] [Accepted: 11/18/2019] [Indexed: 12/04/2022] Open
Abstract
Background Group B streptococcus (GBS) is an important pathogen that is responsible for invasive infections, including sepsis and meningitis. GBS serotyping is an essential means for the investigation of possible infection outbreaks and can identify possible sources of infection. Although it is possible to determine GBS serotypes by either immuno-serotyping or geno-serotyping, both traditional methods are time-consuming and labor-intensive. In recent years, the matrix-assisted laser desorption ionization-time of flight mass spectrometry (MALDI-TOF MS) has been reported as an effective tool for the determination of GBS serotypes in a more rapid and accurate manner. Thus, this work aims to investigate GBS serotypes by incorporating machine learning techniques with MALDI-TOF MS to carry out the identification. Results In this study, a total of 787 GBS isolates, obtained from three research and teaching hospitals, were analyzed by MALDI-TOF MS, and the serotype of the GBS was determined by a geno-serotyping experiment. The peaks of mass-to-charge ratios were regarded as the attributes to characterize the various serotypes of GBS. Machine learning algorithms, such as support vector machine (SVM) and random forest (RF), were then used to construct predictive models for the five different serotypes (Types Ia, Ib, III, V, and VI). After optimization of feature selection and model generation based on training datasets, the accuracies of the selected models attained 54.9–87.1% for various serotypes based on independent testing data. Specifically, for the major serotypes, namely type III and type VI, the accuracies were 73.9 and 70.4%, respectively. Conclusion The proposed models have been adopted to implement a web-based tool (GBSTyper), which is now freely accessible at http://csb.cse.yzu.edu.tw/GBSTyper/, for providing efficient and effective detection of GBS serotypes based on a MALDI-TOF MS spectrum. Overall, this work has demonstrated that the combination of MALDI-TOF MS and machine intelligence could provide a practical means of clinical pathogen testing.
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Affiliation(s)
- Hsin-Yao Wang
- Department of Laboratory Medicine, Chang Gung Memorial Hospital at Linkou, Taoyuan, 33305, Taiwan.,Program in Biomedical Engineering, Chang Gung University, Taoyuan City, Taiwan
| | - Wen-Chi Li
- Warshel Institute for Computational Biology, The Chinese University of Hong Kong, Shenzhen, 518172, China
| | - Kai-Yao Huang
- Warshel Institute for Computational Biology, The Chinese University of Hong Kong, Shenzhen, 518172, China
| | - Chia-Ru Chung
- Department of Computer Science and Information Engineering, National Central University, Taoyuan, 32001, Taiwan
| | - Jorng-Tzong Horng
- Department of Computer Science and Information Engineering, National Central University, Taoyuan, 32001, Taiwan.,Department of Bioinformatics and Medical Engineering, Asia University, Taoyuan City, Taiwan
| | - Jen-Fu Hsu
- Division of Pediatric Neonatology, Department of Pediatrics, Chang Gung Memorial Hospital, Linkou, Taoyuan, 33305, Taiwan. .,School of Traditional Chinese Medicine, College of Medicine, Chang Gung University, Taoyuan, 33302, Taiwan.
| | - Jang-Jih Lu
- Department of Laboratory Medicine, Chang Gung Memorial Hospital at Linkou, Taoyuan, 33305, Taiwan. .,Department of Medical Biotechnology and Laboratory Science, Chang Gung University, Taoyuan, Taiwan. .,Department of Medicine, College of Medicine, Chang Gung University, Taoyuan, Taiwan.
| | - Tzong-Yi Lee
- Warshel Institute for Computational Biology, The Chinese University of Hong Kong, Shenzhen, 518172, China. .,School of Life and Health Sciences, The Chinese University of Hong Kong, Shenzhen, 518172, China.
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13
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Clinical and Microbiological Characteristics of Group B Streptococcus from Pregnant Women and Diseased Infants in Intrapartum Antibiotic Prophylaxis Era in Taiwan. Sci Rep 2019; 9:13525. [PMID: 31537886 PMCID: PMC6753095 DOI: 10.1038/s41598-019-49977-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2019] [Accepted: 08/15/2019] [Indexed: 01/09/2023] Open
Abstract
Group B Streptococcus (GBS) is one of the most important pathogens for neonates. This study included 69 invasive GBS diseases in neonates, including 7 early-onset disease (EOD), 55 late-onset disease, and 7 very-late-onset disease from 2013 to 2017. A significant reduction of EOD after the deployment of intrapartum antibiotic prophylaxis (IAP) in 2012 was observed. A previously-recognized hypervirulent clone GBS III ST17, accounting for 68% of the overall infections and 71% of the meningitis, was identified among the 69 cases. A novel GBS Ia ST890 emerged, becoming the fourth most common clone. Overall 96% of the invasive GBS infections were caused by serotypes Ia, Ib, and III. We collected 300 GBS isolates from vagina of the healthy pregnant women in 2014 and 2017. The serotype distribution of the maternal colonization isolates was VI (35%), III (21%), V (15%), Ib (13%) and Ia (11%) in 2014, and VI (32%), III (22%), V (16%), Ia (16%), and Ib (8%) in 2017. The most common sequence types were ST1 (32%), ST12 (22%), and ST23 (15%). Serotype diversity of maternal colonization strains did not change between 2014 and 2017. The study provides useful information in surveillance of GBS disease in the era of IAP.
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14
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Neemuchwala A, Teatero S, Liang L, Martin I, Demzcuk W, McGeer A, Fittipaldi N. Genetic Diversity and Antimicrobial Drug Resistance of Serotype VI Group B Streptococcus, Canada. Emerg Infect Dis 2019; 24:1941-1942. [PMID: 30226176 PMCID: PMC6154151 DOI: 10.3201/eid2410.171711] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Two genetically dissimilar sequence type 1 clades dominate the serotype VI group B Streptococcus population of strains causing invasive disease in Canada. Isolates of this rare serotype, recovered mainly from adult patients, were all susceptible to penicillin and vancomycin. However, we observed resistance to erythromycin and clindamycin.
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15
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Perinatal Streptococcus agalactiae Epidemiology and Surveillance Targets. Clin Microbiol Rev 2018; 31:31/4/e00049-18. [PMID: 30111577 DOI: 10.1128/cmr.00049-18] [Citation(s) in RCA: 64] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Streptococcus agalactiae, or group B streptococcus (GBS), is a major neonatal pathogen. Recent data have elucidated the global prevalence of maternal and neonatal colonization, but gaps still remain in the epidemiology of this species. A number of phenotypic and genotypic classifications can be used to identify the diversity of GBS strains, and some are more discriminatory than others. This review explores the main schemes used for GBS epidemiology and further details the targets for epidemiological surveillance. Current screening practices across the world provide a unique opportunity to gain detailed information on maternal colonizing strains and neonatal disease-causing strains, which is vital for monitoring and therapeutics, if sufficient detail can be extracted. Deciphering which isolates are circulating within specific populations and recording targets within invasive strains are crucial steps in monitoring the implementation of therapeutics, such as vaccines, as well as developing novel therapies against prevalent GBS strains. Having a detailed understanding of global GBS epidemiology will prove invaluable for understanding the pathogenesis of this organism and equipping future prevention strategies for success.
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16
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Shabayek S, Spellerberg B. Group B Streptococcal Colonization, Molecular Characteristics, and Epidemiology. Front Microbiol 2018; 9:437. [PMID: 29593684 PMCID: PMC5861770 DOI: 10.3389/fmicb.2018.00437] [Citation(s) in RCA: 151] [Impact Index Per Article: 25.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2017] [Accepted: 02/26/2018] [Indexed: 11/13/2022] Open
Abstract
Streptococcus agalactiae or group B streptococcus (GBS) is a leading cause of serious neonatal infections. GBS is an opportunistic commensal constituting a part of the intestinal and vaginal physiologic flora and maternal colonization is the principal route of GBS transmission. GBS is a pathobiont that converts from the asymptomatic mucosal carriage state to a major bacterial pathogen causing severe invasive infections. At present, as many as 10 serotypes (Ia, Ib, and II–IX) are recognized. The aim of the current review is to shed new light on the latest epidemiological data and clonal distribution of GBS in addition to discussing the most important colonization determinants at a molecular level. The distribution and predominance of certain serotypes is susceptible to variations and can change over time. With the availability of multilocus sequence typing scheme (MLST) data, it became clear that GBS strains of certain clonal complexes possess a higher potential to cause invasive disease, while other harbor mainly colonizing strains. Colonization and persistence in different host niches is dependent on the adherence capacity of GBS to host cells and tissues. Bacterial biofilms represent well-known virulence factors with a vital role in persistence and chronic infections. In addition, GBS colonization, persistence, translocation, and invasion of host barriers are largely dependent on their adherence abilities to host cells and extracellular matrix proteins (ECM). Major adhesins mediating GBS interaction with host cells include the fibrinogen-binding proteins (Fbs), the laminin-binding protein (Lmb), the group B streptococcal C5a peptidase (ScpB), the streptococcal fibronectin binding protein A (SfbA), the GBS immunogenic bacterial adhesin (BibA), and the hypervirulent adhesin (HvgA). These adhesins facilitate persistent and intimate contacts between the bacterial cell and the host, while global virulence regulators play a major role in the transition to invasive infections. This review combines for first time epidemiological data with data on adherence and colonization for GBS. Investigating the epidemiology along with understanding the determinants of mucosal colonization and the development of invasive disease at a molecular level is therefore important for the development of strategies to prevent invasive GBS disease worldwide.
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Affiliation(s)
- Sarah Shabayek
- Department of Microbiology and Immunology, Faculty of Pharmacy, Suez Canal University, Ismailia, Egypt
| | - Barbara Spellerberg
- Institute of Medical Microbiology and Hygiene, University of Ulm, Ulm, Germany
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17
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Lin HC, Lu JJ, Lin LC, Ho CM, Hwang KP, Liu YC, Chen CJ. Identification of a proteomic biomarker associated with invasive ST1, serotype VI Group B Streptococcus by MALDI-TOF MS. JOURNAL OF MICROBIOLOGY, IMMUNOLOGY, AND INFECTION = WEI MIAN YU GAN RAN ZA ZHI 2017; 52:81-89. [PMID: 29317173 DOI: 10.1016/j.jmii.2017.11.007] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2017] [Revised: 11/13/2017] [Accepted: 11/27/2017] [Indexed: 01/17/2023]
Abstract
BACKGROUND Group B Streptococcus (GBS) is an important invasive pathogen in neonates, pregnant women and the elderly. Serotype VI GBS, which has been rarely reported globally, has emerged as a significant pathogen in Asia. However, traditional serologic latex agglutination (LA) methods may fail to type isolates that lack of or low expression of CPS. METHODS A total of 104 GBS strains were analyzed by MALDI-TOF MS. Multiplex PCR and multilocus sequence typing (MLST) were also performed to confirm their strains. The protein markers were purified with gel electrophoresis and LC-column, followed by identification with nanoLC-MS/MS analysis. RESULTS Protein peak of 6251-Da was appeared in most (20/24, 92%) serotypes VI (94% ST-1 or single locus variant of ST-1), and protein peak of 6891-Da was appeared in most serotypes III (15/18, 83%) and Ib (19/23, 83%) strains. The protein peak of 6251-Da and 6891-Da were identified as CsbD family protein and UPF0337 protein gbs0600, respectively. CONCLUSIONS The protein peak of 6251 Da may play a role of emergence of ST-1 clone, serotype VI GBS in central Taiwan and could be useful in rapid identifying invasive serotype VI from III isolates, which is hardly achieved by LA.
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Affiliation(s)
- Hsiao-Chuan Lin
- School of Medicine, China Medical University, Taichung, Taiwan; Department of Pediatric Infectious Diseases, China Medical University Children's Hospital, Taichung, Taiwan
| | - Jang-Jih Lu
- Department of Laboratory Medicine, Linkou Chang-Gung Memorial Hospital, Taoyuan, Taiwan; Department of Medical Research, China Medical University Hospital, Taichung, Taiwan; Department of Medical Biotechnology and Laboratory Science, Chang Gung University, Kwei-Shan, Taoyuan, Taiwan
| | - Lee-Chung Lin
- Department of Laboratory Medicine, Linkou Chang-Gung Memorial Hospital, Taoyuan, Taiwan
| | - Cheng-Mao Ho
- Division of Infectious Diseases, Department of Internal Medicine, China Medical University Hospital, Taichung, Taiwan
| | - Kao-Pin Hwang
- School of Medicine, China Medical University, Taichung, Taiwan; Department of Pediatric Infectious Diseases, China Medical University Children's Hospital, Taichung, Taiwan
| | - Yu-Ching Liu
- Proteomics Core Laboratory, Department of Medical Research, China Medical University Hospital, Taichung, Taiwan
| | - Chao-Jung Chen
- Proteomics Core Laboratory, Department of Medical Research, China Medical University Hospital, Taichung, Taiwan; Graduate Institute of Integrated Medicine, China Medical University, Taichung, Taiwan.
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18
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Molecular Characteristics of Group B Streptococci Isolated from Adults with Invasive Infections in Japan. J Clin Microbiol 2016; 54:2695-2700. [PMID: 27558182 DOI: 10.1128/jcm.01183-16] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2016] [Accepted: 08/15/2016] [Indexed: 01/18/2023] Open
Abstract
Streptococcus agalactiae (group B streptococcus) isolates (n = 443) obtained from Japanese adults with invasive infections between April 2010 and March 2013 were analyzed for capsular serotype, multilocus sequence type (ST), antibiotic susceptibility, and resistance genes. Among these cases, bacteremia without primary focus was the most common variety of infection (49.9%), followed by cellulitis (12.9%) and pneumonia (9.0%). Concerning patient age (18 to 59, 60 to 69, 70 to 79, 80 to 89, and 90 years old or older), the incidence of pneumonia increased in patients in their 70s and 80s (P < 0.001), while younger patients (18 to 59 and 60 to 69 years old) were more likely to have abscesses (P < 0.05). The mortality rate was 10.2% for all ages. The most common capsular serotype was Ib (39.5%), followed by V (16.0%), III (13.8%), VI (9.5%), and Ia (8.6%). The main ST of serotype Ib strains was ST10, which belonged to clonal complex 10 (88.0%). The predominant clonal complexes of serotypes V and III, respectively, were 1 (78.9%) and 19 (75.4%). Among these isolates, 9 strains (2.0%) were identified as group B streptococci with reduced penicillin susceptibility, reflecting amino acid substitutions in penicillin-binding protein 2X (PBP2X). In addition, 19.2% of all strains possessed mef(A/E), erm(A), or erm(B) genes, which mediate macrolide resistance, while 40.2% of strains were resistant to quinolones resulting from amino acid substitutions in GyrA and ParC. Our data argue strongly for the continuous surveillance of microbial characteristics and judicious antibiotic use in clinical practice.
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19
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Foster-Nyarko E, Kwambana B, Aderonke O, Ceesay F, Jarju S, Bojang A, McLellan J, Jafali J, Kampmann B, Ota MO, Adetifa I, Antonio M. Associations between nasopharyngeal carriage of Group B Streptococcus and other respiratory pathogens during early infancy. BMC Microbiol 2016; 16:97. [PMID: 27230066 PMCID: PMC4882866 DOI: 10.1186/s12866-016-0714-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2015] [Accepted: 05/19/2016] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND In West Africa, the carriage of Group B Streptococcus (GBS), among infants is poorly characterised. We investigated co-carriage of GBS with other respiratory pathogens in the infants' nasopharynx in The Gambia. METHODS We assessed the carriage, serotypes and antibiotic susceptibility of Beta-haemolytic Streptococci (BHS) groups A-G; along with the carriage of Streptococcus pneumoniae; Haemophilus influenzae; Staphylococcus aureus and Moraxella catarrhalis in 1200 two-month old infants. RESULTS The BHS prevalence was 20.0 % and GBS dominated (13.8 %), particularly serotypes V and II; serotype V being negatively associated with H. Influenzae carriage (OR 0.41 [95 % CI: 0.18-0.93], p = 0.033). Although co-colonization of GBS and other BHS was not seen, colonization with GBS was positively associated with S. aureus (OR 1.89 [95 % CI: 1.33-2.69], P < 0.001) and negatively associated with S. pneumoniae (OR 0.47 [95 % CI: 0.33-0.67], p < 0.001) and M. catarrhalis (OR 0.61 [95 % CI: 0.40-0.92], p = 0.017). ≥ 89 % of GBS isolates were susceptible to most antibiotics tested, except for tetracycline resistance, which was 89 %. CONCLUSION This study provides baseline data on the carriage of GBS in two month old infants from West Africa. The dominant serotypes of GBS in this setting are serotypes V and II. This may be important for future GBS vaccine development for the West African sub-region.
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Affiliation(s)
| | - Brenda Kwambana
- Vaccines and Immunity Theme, Medical Research Council Unit, Banjul, The Gambia
| | - Odutola Aderonke
- Vaccines and Immunity Theme, Medical Research Council Unit, Banjul, The Gambia
| | - Fatima Ceesay
- Vaccines and Immunity Theme, Medical Research Council Unit, Banjul, The Gambia
| | - Sheikh Jarju
- Vaccines and Immunity Theme, Medical Research Council Unit, Banjul, The Gambia
| | - Abdoulie Bojang
- Vaccines and Immunity Theme, Medical Research Council Unit, Banjul, The Gambia
| | - Jessica McLellan
- Vaccines and Immunity Theme, Medical Research Council Unit, Banjul, The Gambia
| | - James Jafali
- Vaccines and Immunity Theme, Medical Research Council Unit, Banjul, The Gambia
| | - Beate Kampmann
- Vaccines and Immunity Theme, Medical Research Council Unit, Banjul, The Gambia
| | - Martin O Ota
- Vaccines and Immunity Theme, Medical Research Council Unit, Banjul, The Gambia
- Current Address: WHO Regional Office for Africa, Brazzaville, Congo
| | - Ifedayo Adetifa
- Disease Control and Elimination Theme, Medical Research Council Unit, Banjul, The Gambia
- Current Address: Infectious Diseases Epidemiology, London School of Hygiene & Tropical Medicine, London, UK
| | - Martin Antonio
- Vaccines and Immunity Theme, Medical Research Council Unit, Banjul, The Gambia.
- Faculty of Infectious and Tropical Diseases, London School of Hygiene & Tropical Medicine, London, UK.
- Microbiology and Infection Unit, Warwick Medical School, University of Warwick, Coventry, UK.
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20
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Wang YH, Lu CC, Chiu CH, Wang MH, Yang TH, Chu C. Genetically diverse serotypes III and VI substitute major clonal disseminated serotypes Ib and V as prevalent serotypes of Streptococcus agalactiae from 2007 to 2012. JOURNAL OF MICROBIOLOGY, IMMUNOLOGY, AND INFECTION = WEI MIAN YU GAN RAN ZA ZHI 2015; 49:672-678. [PMID: 26316010 DOI: 10.1016/j.jmii.2015.05.022] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2015] [Revised: 05/14/2015] [Accepted: 05/28/2015] [Indexed: 10/23/2022]
Abstract
BACKGROUND Streptococcus agalactiae [group B Streptococcus (GBS)] has become more prevalent in nonpregnant women, the elderly, and people who are immunocompromised. We investigated the serotype and genomic changes of GBS human isolates from different hospitals from 2007 to 2012. METHODS The serotype and genotype of 658 GBS human isolates were determined with multiplex polymerase chain reaction and pulsed field gel electrophoresis analysis. Multilocus sequence typing analysis determined the sequence type (ST) of the major clones of serotypes Ib, V, and VI. RESULTS Most of the isolates were collected from urine samples (60.5%) with a reduction in the rate from 74.6% in 2007 to 34.5% in 2012 and from infected patients older than 30 years (72.6%). The female/male ratio differed depending on the source: 3.52 in the urine group, 0.48 in the wound group, and 0.43 in pus. Serotypes Ib (16.5%), III (16.9%), V (27.2%), and VI (17.6%) were the most predominant among the nine serotypes identified and were separated into two prevalence patterns: a decrease in serotypes Ib and V and an increase in serotypes III and VI from 2007 to 2012. The prevalence change was associated with the urine group. Additionally, serotype VI become more prevalent in blood samples in four hospitals. The pulsed field gel electrophoresis analysis demonstrated three genetic patterns: limited pulsotypes and a major clonal dissemination for serotypes Ib and V, diverse pulsotypes for serotypes III, and diverse pulsotypes with a major clonal dissemination for serotype VI. Multilocus sequence typing analysis of the major clones identified ST12 for serotype Ib and ST1 for serotypes V and VI. CONCLUSION Rapid genomic variations with different evolutionary patterns have led to the establishment of serotypes III and VI as the predominant GBS serotypes.
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Affiliation(s)
- Ying-Hsiang Wang
- Department of Pediatrics, Chang Gung Memorial Hospital, Chiayi, Taiwan, ROC
| | - Chih-Cheng Lu
- Department of Microbiology, Immunology, and Biopharmaceuticals, National Chiayi University, Chiayi, Taiwan, ROC
| | - Cherng-Hsun Chiu
- Graduate Institute of Clinical Medical Sciences, Chang Gung University College of Medicine, Taoyuan, Taiwan, ROC; Division of Pediatric Infectious Diseases, Chang Gung Children's Hospital, Taoyuan, Taiwan, ROC
| | - Mei-Hei Wang
- Department of Pediatrics, Chang Gung Memorial Hospital, Chiayi, Taiwan, ROC
| | - Tsung-Han Yang
- Department of Laboratory Medicine, Chang Gung Memorial Hospital, Taoyuan, Taiwan, ROC
| | - Chishih Chu
- Department of Microbiology, Immunology, and Biopharmaceuticals, National Chiayi University, Chiayi, Taiwan, ROC.
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