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Dilrukshi N, Kottahachchi J, Dissanayake T, Weerasekera M, Sampath A, Fernando N. Unravelling Streptococcus agalactiae: Serotype distribution, virulence factors, obstetrics history and clinical presentation correlations in tertiary care hospitals of the western province of Sri Lanka. Indian J Med Microbiol 2024; 49:100617. [PMID: 38763381 DOI: 10.1016/j.ijmmb.2024.100617] [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: 10/06/2023] [Revised: 05/16/2024] [Accepted: 05/16/2024] [Indexed: 05/21/2024]
Abstract
PURPOSE This study investigated to detect serotypes and virulence genes of Group B Streptococcus (GBS) isolated from pregnant women. METHODS Forty-five samples of GBS isolates from January to August 2019 at antenatal clinics of 4 teaching hospitals in Western Province, Sri Lanka were included. Isolated GBS were carried to identify 9 serotypes by multiplex PCR. Different virulence determinants, including bac, rib and scp(B) have been detected by PCR. RESULTS Among GBS-positive culture isolates most abundant serotype detected was type III 12/45 (26.7%) while serotype VII, VIII and IX were not seen. Furthermore, serotype Ia (15.6%); II (20%); V (17.8%); VI (15.6%); Ib (2.2%) and IV (2.2%) were identified. Among 5 rectal isolates, 1 isolate was serotype Ia, 2 isolates were serotype II and 2 isolates were serotype III. Forty (40/45) isolates expressed scpB gene (88.8%). Presence of rib gene was confirmed in 17.8%, bac in 13.3% isolates. ScpB, rib and bac were identified in 4.4% isolates, 8.9% isolates were scpB, rib positive and bac negative, 8.9% isolates were scpB, bac positive and rib negative. These three-virulence genes did not express in 8.9% isolates. ScpB gene was found once in serotype Ib and IV and all serotype VI expressed scpB gene. Rib gene was more common among serotype II and it was not found in serotype Ib, IV and VI. Bac gene was more common in serotype V and it was not found in serotype Ia, Ib and IV. There was not significant association between serotypes and virulence gene (p > 0.05). CONCLUSION Serotype III is the most abundant serotype. In formulation of vaccine against GBS for Sri Lanka, serotype III should be targeted. Prevalence of vaccine candidate virulence protein such as β antigens of the C protein (bac) and surface protein Rib (rib) genes were low in this study.
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Affiliation(s)
- Niluka Dilrukshi
- University of Sri Jayewardenepura, Faculty of Medical Sciences, Department of Microbiology, Nugegoda, Gangodawila, Sri Lanka; University of Sri Jayewardenepura, Faculty of Graduate Studies, Nugegoda, Gangodawila, Sri Lanka; Faculty of Health Sciences, Department of Medical Laboratory Sciences, The Open University, Sri Lanka.
| | - Jananie Kottahachchi
- University of Sri Jayewardenepura, Faculty of Medical Sciences, Department of Microbiology, Nugegoda, Gangodawila, Sri Lanka.
| | - Thushari Dissanayake
- University of Sri Jayewardenepura, Faculty of Medical Sciences, Department of Microbiology, Nugegoda, Gangodawila, Sri Lanka.
| | - Manjula Weerasekera
- University of Sri Jayewardenepura, Faculty of Medical Sciences, Department of Microbiology, Nugegoda, Gangodawila, Sri Lanka.
| | - Asanga Sampath
- University of Sri Jayewardenepura, Faculty of Medical Sciences, Department of Microbiology, Nugegoda, Gangodawila, Sri Lanka.
| | - Neluka Fernando
- University of Sri Jayewardenepura, Faculty of Medical Sciences, Department of Microbiology, Nugegoda, Gangodawila, Sri Lanka.
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Dilrukshi N, Kottahachchi J, Dissanayake T, Fernando N. Antibiotic Sensitivity of Group B Streptococcus from Pregnant Mothers and Its Association with Resistance Genes. Med Princ Pract 2023; 32:126-132. [PMID: 37023724 PMCID: PMC10319089 DOI: 10.1159/000530525] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Accepted: 03/30/2023] [Indexed: 04/08/2023] Open
Abstract
OBJECTIVE This study assessed the antibiotic susceptibility and characterized antibiotic resistance genes of group B Streptococcus (GBS) isolates from selected tertiary care hospitals in Western Province, Sri Lanka. METHODS A descriptive cross-sectional study was carried out to determine antibiotic sensitivity of GBS among 175 pregnant women of >35 weeks of gestation attending antenatal clinics in four teaching hospitals. Low vaginal and rectal swabs were collected separately, and GBS was identified by standard microbiological methods. Antibiotic sensitivity and minimum inhibitory concentration (MIC) were performed according to Clinical and Laboratory Standards Institute (CLSI) guidelines. DNA was extracted from culture isolates, and antibiotic-resistant genes were identified by polymerase chain reaction using ermB, ermTR, mefA, and linB genes. RESULTS GBS colonization in the study sample was 25.7% (45/175) with detection rate of 22.9% (40/175) and 2.9% (5/175) in vaginal and rectal samples, respectively. All isolates were susceptible to penicillin with an MIC range of 0.03-0.12 μg/mL. Six isolates (13.3%) were intermediate, and 11 isolates (24.4%) were resistant to erythromycin. There were 5 intermediately resistant isolates (11.1%) and 10 resistant isolates (22.2%) for clindamycin. Of them, seven had inducible clindamycin resistance (iMLSB). MIC range of erythromycin was 0.03-0.32 μg/mL and that of clindamycin was 0.06-0.32 μg/mL. ermB gene was detected in 7 (15.5%). ermTR gene was found in 16 (35.6%) and was significantly associated with iMLSB phenotype (p = 0.005). mefA gene was detected in two (4.4%) isolates, while linB gene was not detected in tested isolates. CONCLUSION All isolates were sensitive to penicillin, and the most prevalent resistance genotype was ermTR in the study population.
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Affiliation(s)
- Niluka Dilrukshi
- Department of Microbiology, Faculty of Medical Sciences, University of Sri Jayewardenepura, Nugegoda, Sri Lanka
- Medical Research Institute, Colombo, Sri Lanka
| | - Jananie Kottahachchi
- Department of Microbiology, Faculty of Medical Sciences, University of Sri Jayewardenepura, Nugegoda, Sri Lanka
| | - Thushari Dissanayake
- Department of Microbiology, Faculty of Medical Sciences, University of Sri Jayewardenepura, Nugegoda, Sri Lanka
| | - Neluka Fernando
- Department of Microbiology, Faculty of Medical Sciences, University of Sri Jayewardenepura, Nugegoda, Sri Lanka
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Liu Z, Jiang X, Li J, Ji W, Zhou H, Gong X, Miao B, Meng S, Duan L, Shi Q, Han X, Gao P, Chang C, Dong A, Li J. Molecular characteristics and antibiotic resistance mechanisms of clindamycin-resistant Streptococcus agalactiae isolates in China. Front Microbiol 2023; 14:1138039. [PMID: 36937303 PMCID: PMC10014864 DOI: 10.3389/fmicb.2023.1138039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2023] [Accepted: 02/13/2023] [Indexed: 03/05/2023] Open
Abstract
Streptococcus agalactiae (Group B Streptococcus, GBS) is a major cause of neonatal infections with high morbidity and mortality, and clindamycin is the main antibiotic used to treat GBS infections in patients allergic to penicillin. We aimed to analyse the antibiotic sensitivity, sequence types, serotypes, virulence factors, and antibiotic resistance mechanisms of clinically isolated clindamycin-resistant S. agalactiae and provide basic data for the treatment, prevention, and control of clinical infection of S. agalactiae. A total of 110 strains of clindamycin-resistant S. agalactiae were collected from two tertiary hospitals in Hebei, China. We performed antibiotic sensitivity tests for 11 antibiotics on these strains and whole-genome sequencing analysis. All the strains were susceptible to penicillin, ampicillin, linezolid, vancomycin, tigecycline, and quinupristin-dalfopristin. Resistance to erythromycin, levofloxacin, tetracycline, and chloramphenicol were also observed. Genome sequence analysis revealed that all strains belonged to 12 sequence types (STs) related to six cloning complexes (CCs), namely CC10, CC19, CC23, CC651, CC1, and CC17. Five serotypes were identified, including IA, IB, II, III, and V. The most prominent resistance genes were mreA (100%) and ermB (81.8%). Furthermore, cfb, cylE, pavA and the gene cluster related to the pili were 100% present in all strains, followed by lmb (95.5%) and srr1 (67.2%). This study found that clindamycin-resistant S. agalactiae showed polymorphisms in molecular types and serotypes. Furthermore, multiple virulence factor genes have been identified in their genomes.
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Affiliation(s)
- Zeliang Liu
- Affiliated Hospital of North China University of Science and Technology, Tangshan, Hebei, China
- State Key Laboratory for Infectious Disease Prevention and Control, Chinese Center for Disease Control and Prevention, National Institute for Communicable Disease Control and Prevention, Beijing, China
| | - Xueqi Jiang
- State Key Laboratory for Infectious Disease Prevention and Control, Chinese Center for Disease Control and Prevention, National Institute for Communicable Disease Control and Prevention, Beijing, China
| | - Jie Li
- State Key Laboratory for Infectious Disease Prevention and Control, Chinese Center for Disease Control and Prevention, National Institute for Communicable Disease Control and Prevention, Beijing, China
| | - Wenjing Ji
- Department of Pharmacy Administration and Clinical Pharmacy, School of Pharmacy, Xi’an Jiaotong University, Xi’an, China
| | - Haijian Zhou
- State Key Laboratory for Infectious Disease Prevention and Control, Chinese Center for Disease Control and Prevention, National Institute for Communicable Disease Control and Prevention, Beijing, China
| | - Xinyi Gong
- State Key Laboratory for Infectious Disease Prevention and Control, Chinese Center for Disease Control and Prevention, National Institute for Communicable Disease Control and Prevention, Beijing, China
| | - Beibei Miao
- State Key Laboratory for Infectious Disease Prevention and Control, Chinese Center for Disease Control and Prevention, National Institute for Communicable Disease Control and Prevention, Beijing, China
| | - Shuang Meng
- State Key Laboratory for Infectious Disease Prevention and Control, Chinese Center for Disease Control and Prevention, National Institute for Communicable Disease Control and Prevention, Beijing, China
| | - Like Duan
- Affiliated Hospital of North China University of Science and Technology, Tangshan, Hebei, China
| | - Qiyuan Shi
- Affiliated Hospital of North China University of Science and Technology, Tangshan, Hebei, China
| | - Xiao Han
- Affiliated Hospital of North China University of Science and Technology, Tangshan, Hebei, China
| | - Pengfang Gao
- Affiliated Hospital of North China University of Science and Technology, Tangshan, Hebei, China
| | - Chienyi Chang
- Faculty of Medical Sciences, School of Dental Sciences, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Aiying Dong
- Affiliated Hospital of North China University of Science and Technology, Tangshan, Hebei, China
- *Correspondence: Aiying Dong,
| | - Juan Li
- State Key Laboratory for Infectious Disease Prevention and Control, Chinese Center for Disease Control and Prevention, National Institute for Communicable Disease Control and Prevention, Beijing, China
- Juan Li,
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Kawaguchiya M, Urushibara N, Aung MS, Shimada S, Nakamura M, Ito M, Habadera S, Kobayashi N. Molecular characterization and antimicrobial resistance of Streptococcus agalactiae isolated from pregnant women in Japan, 2017–2021. IJID REGIONS 2022; 4:143-145. [PMID: 35923645 PMCID: PMC9340534 DOI: 10.1016/j.ijregi.2022.07.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Revised: 06/28/2022] [Accepted: 07/01/2022] [Indexed: 11/20/2022]
Abstract
Group B streptococcus (GBS) in pregnant women was studied in northern Japan. Colonizing GBS was isolated from 7.0% (n=76/1090) of the pregnant women. Capsular serotype III/ST335, Ia/ST23, III/ST17, and V/ST1 lineages were dominant. Levofloxacin resistance was found in 15.8%, with serotype Ib being the most common. Most levofloxacin-resistant isolates belonged to serotype Ib/CC10 or V/CC19.
Objectives This study aimed to elucidate the molecular characteristics and antimicrobial resistance of Streptococcus agalactiae (group B streptococcus, GBS) colonizing pregnant women in Japan. Methods GBS isolates obtained from screening of pregnant women from 2017 to 2021 were analyzed for capsular serotype, sequence type (ST), and antimicrobial susceptibility. For levofloxacin-resistant isolates, mutations in the quinolone resistance-determining regions (QRDRs) of the gyrA, gyrB, and parC genes were analyzed. Results Seventy-six GBS isolates were recovered from 1090 women (isolation rate: 7.0%). Of the 76 isolates, serotype III (31.6%) was the most prevalent, followed by V (19.7%), Ia (17.1%), and Ib (10.5%). Among the 22 STs identified, capsular serotype III/ST335-clonal complex (CC) 19 lineage was dominant (13.2%), followed by Ia/ST23, III/ST17, and V/ST1. Levofloxacin resistance was detected in 15.8% (n=12) of all the isolates, with serotype Ib being the most common. Most levofloxacin resistant isolates belonged to serotype Ib/CC10 or serotype V/CC19, with double mutations in the QRDRs, Ser81Leu in GyrA and Ser79Phe in ParC. Conclusions The present study indicates the prevalence of the serotype III/ST335 (CC19) lineage, and the spread of serotype Ib/CC10 and serotype V/CC19 lineages, which are responsible for levofloxacin resistance in colonizing GBS in pregnant women in Japan.
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Affiliation(s)
- Mitsuyo Kawaguchiya
- Department of Hygiene, Sapporo Medical University School of Medicine, Sapporo, Japan
- Corresponding author; Mitsuyo Kawaguchiya, Department of Hygiene, Sapporo Medical University School of Medicine, S-1 W-17, Chuo-ku, Sapporo 060-8556, Japan, Tel: +81-11-611-2111 (ext.27330).
| | - Noriko Urushibara
- Department of Hygiene, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Meiji Soe Aung
- Department of Hygiene, Sapporo Medical University School of Medicine, Sapporo, Japan
| | | | | | - Masahiko Ito
- Sapporo Clinical Laboratory, Inc., Sapporo, Japan
| | | | - Nobumichi Kobayashi
- Department of Hygiene, Sapporo Medical University School of Medicine, Sapporo, Japan
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