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Zhou J, Zhang L, Zhang Y, Liu H, Xu K, Zhang B, Feng T, Yang S. Analysis of molecular characteristics of CAMP-negative Streptococcus agalactiae strains. Front Microbiol 2023; 14:1189093. [PMID: 37293216 PMCID: PMC10244789 DOI: 10.3389/fmicb.2023.1189093] [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: 03/18/2023] [Accepted: 05/03/2023] [Indexed: 06/10/2023] Open
Abstract
Background Streptococcus agalactiae can produce CAMP factor, which can promote the β-hemolysin activity of Staphylococcus aureus, forming an arrow-shaped hemolysis enhancement zone at the intersection of the two bacterial species on a blood agar plate. This characteristic feature of Streptococcus agalactiae has led to the widespread use of the CAMP test as an identification method. Methods Vaginal/rectal swabs, collected from women at 35-37 weeks of pregnancy, were first inoculated into a selective enrichment broth media, then subcultured onto GBS chromogenic agar and 5% sheep blood agar sequentially. The VITEK-2 automatic identification system and MALDI-TOF MS were initially employed for identification, followed by the CAMP test. CAMP-negative strains underwent 16S rDNA and cfb gene sequence analysis, as well as bacterial multilocus sequence typing. Results A total of 190 strains were isolated, with 15 identified as CAMP-negative. Further 16S rDNA gene sequence analysis confirmed that all 15 strains were Streptococcus agalactiae. The MLST typing assay revealed that these 15 strains were of the ST862 type. The cfb gene was amplified and electrophoresed, but no specific fragments were found, indicating that these strains lack the CAMP factor due to cfb gene deletion. Antibiotic susceptibility tests demonstrated no resistance to penicillin, ampicillin, vancomycin and linezolid among the GBS strains. However, there are significant differences in resistance rates to tetracycline. Conclusion This study found that 7.9% of GBS strains isolated from the vagina/rectum of pregnant women were CAMP-negative, suggesting that the CAMP test method or primers targeting the cfb gene should not be used as the sole presumptive test for GBS identification.
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Affiliation(s)
- Jie Zhou
- Department of Clinical Laboratory, Pingshan General Hospital, Southern Medical University (Pingshan District People’s Hospital of Shenzhen), Shenzhen, Guangdong, China
| | - Li Zhang
- Department of Clinical Laboratory, Pingshan General Hospital, Southern Medical University (Pingshan District People’s Hospital of Shenzhen), Shenzhen, Guangdong, China
| | - Yang Zhang
- Department of Clinical Laboratory, Pingshan General Hospital, Southern Medical University (Pingshan District People’s Hospital of Shenzhen), Shenzhen, Guangdong, China
| | - Hui Liu
- Department of Pharmacy, Pingshan General Hospital, Southern Medical University (Pingshan District People’s Hospital of Shenzhen), Shenzhen, Guangdong, China
| | - Kangli Xu
- Department of Clinical Laboratory, Pingshan General Hospital, Southern Medical University (Pingshan District People’s Hospital of Shenzhen), Shenzhen, Guangdong, China
| | - Baohu Zhang
- Department of Clinical Laboratory, Pingshan General Hospital, Southern Medical University (Pingshan District People’s Hospital of Shenzhen), Shenzhen, Guangdong, China
| | - Tianyuan Feng
- Department of Clinical Laboratory, Pingshan General Hospital, Southern Medical University (Pingshan District People’s Hospital of Shenzhen), Shenzhen, Guangdong, China
| | - Shucai Yang
- Department of Clinical Laboratory, Pingshan General Hospital, Southern Medical University (Pingshan District People’s Hospital of Shenzhen), Shenzhen, Guangdong, China
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Bigus D, Lewandowska W, Bięga E, Grela A, Siedlar A, Sosnowska M, Fabisiak M, Łęga T, Dashkievich Y, Nowacka-Dośpiał J, Palka K, Żołędowska S, Nidzworski D. Ultra-Fast Impedimetric Immunoassay for Detection of Streptococcus agalactiae Using Carbon Electrode with Nanodiamonds Film. MICROMACHINES 2023; 14:mi14051076. [PMID: 37241699 DOI: 10.3390/mi14051076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2023] [Revised: 05/09/2023] [Accepted: 05/15/2023] [Indexed: 05/28/2023]
Abstract
This publication presents the results of work on the development of a quick and cheap electrochemical immunosensor for the diagnosis of infections with the pathogen Streptococcus agalactiae. The research was carried out on the basis of the modification of the well-known glassy carbon (GC) electrodes. The surface of the GC (glassy carbon) electrode was covered with a film made of nanodiamonds, which increased the number of sites for the attachment of anti-Streptococcus agalactiae antibodies. The GC surface was activated with EDC/NHS (1-Ethyl-3-(3-dimethylaminopropyl)carbodiimide/N-Hydroxysuccinimide). Determination of electrode characteristics after each modification step, performed using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS).
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Affiliation(s)
- Daniel Bigus
- Institute of Biotechnology and Molecular Medicine, Kampinoska 25, 80-180 Gdansk, Poland
| | - Wioleta Lewandowska
- Institute of Biotechnology and Molecular Medicine, Kampinoska 25, 80-180 Gdansk, Poland
| | - Ewelina Bięga
- Institute of Biotechnology and Molecular Medicine, Kampinoska 25, 80-180 Gdansk, Poland
| | - Anna Grela
- Institute of Biotechnology and Molecular Medicine, Kampinoska 25, 80-180 Gdansk, Poland
| | - Aleksandra Siedlar
- Institute of Biotechnology and Molecular Medicine, Kampinoska 25, 80-180 Gdansk, Poland
| | - Marta Sosnowska
- Institute of Biotechnology and Molecular Medicine, Kampinoska 25, 80-180 Gdansk, Poland
| | - Magdalena Fabisiak
- Institute of Biotechnology and Molecular Medicine, Kampinoska 25, 80-180 Gdansk, Poland
| | - Tomasz Łęga
- Institute of Biotechnology and Molecular Medicine, Kampinoska 25, 80-180 Gdansk, Poland
| | - Yanina Dashkievich
- Institute of Biotechnology and Molecular Medicine, Kampinoska 25, 80-180 Gdansk, Poland
| | | | - Katarzyna Palka
- Institute of Biotechnology and Molecular Medicine, Kampinoska 25, 80-180 Gdansk, Poland
| | - Sabina Żołędowska
- Institute of Biotechnology and Molecular Medicine, Kampinoska 25, 80-180 Gdansk, Poland
| | - Dawid Nidzworski
- Institute of Biotechnology and Molecular Medicine, Kampinoska 25, 80-180 Gdansk, Poland
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Sroka-Oleksiak A, Pabian W, Sobońska J, Drożdż K, Bogiel T, Brzychczy-Włoch M. Do NAAT-Based Methods Increase the Diagnostic Sensitivity of Streptococcus agalactiae Carriage Detection in Pregnant Women? Diagnostics (Basel) 2023; 13:diagnostics13050863. [PMID: 36900007 PMCID: PMC10001255 DOI: 10.3390/diagnostics13050863] [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: 01/05/2023] [Revised: 02/20/2023] [Accepted: 02/21/2023] [Indexed: 02/26/2023] Open
Abstract
The aim of the study was to evaluate particular polymerase chain reaction primers targeting selected representative genes and the influence of a preincubation step in a selective broth on the sensitivity of group B Streptococcus (GBS) detection by nucleic acid amplification techniques (NAAT). Research samples were vaginal and rectal swabs collected in duplicate from 97 pregnant women. They were used for enrichment broth culture-based diagnostics, bacterial DNA isolation, and amplification, using primers based on species-specific 16S rRNA, atr and cfb genes. To assess the sensitivity of GBS detection, additional isolation of samples preincubated in Todd-Hewitt broth with colistin and nalidixic acid was performed and then subjected to amplification again. The introduction of the preincubation step increased the sensitivity of GBS detection by about 33-63%. Moreover, NAAT made it possible to identify GBS DNA in an additional six samples that were negative in culture. The highest number of true positive results compared to the culture was obtained with the atr gene primers, as compared to cfb and 16S rRNA primers. Isolation of bacterial DNA after preincubation in enrichment broth significantly increases the sensitivity of NAAT-based methods applied for the detection of GBS from vaginal and rectal swabs. In the case of the cfb gene, the use of an additional gene to ensure the appropriate results should be considered.
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Affiliation(s)
- Agnieszka Sroka-Oleksiak
- Department of Molecular Medical Microbiology, Chair of Microbiology, Faculty of Medicine, Jagiellonian University Medical College, 31-121 Krakow, Poland
- Correspondence: (A.S.-O.); (T.B.); (M.B.-W.); Tel.: +48-1263-308-77 (A.S.-O.); +48-52-585-44-80 (T.B.); +48-1263-325-67 (M.B.-W.)
| | - Wojciech Pabian
- Clinical Department of Gynecological Endocrinology and Gynecology, Jagiellonian University Medical College, 31-501 Krakow, Poland
| | - Joanna Sobońska
- Department of Molecular Medical Microbiology, Chair of Microbiology, Faculty of Medicine, Jagiellonian University Medical College, 31-121 Krakow, Poland
| | - Kamil Drożdż
- Department of Molecular Medical Microbiology, Chair of Microbiology, Faculty of Medicine, Jagiellonian University Medical College, 31-121 Krakow, Poland
| | - Tomasz Bogiel
- Department of Microbiology, Ludwik Rydygier Collegium Medicum in Bydgoszcz, Nicolaus Copernicus University in Toruń, 85-094 Bydgoszcz, Poland
- Department of Clinical Microbiology, Antoni Jurasz University Hospital No. 1, 85-094 Bydgoszcz, Poland
- Correspondence: (A.S.-O.); (T.B.); (M.B.-W.); Tel.: +48-1263-308-77 (A.S.-O.); +48-52-585-44-80 (T.B.); +48-1263-325-67 (M.B.-W.)
| | - Monika Brzychczy-Włoch
- Department of Molecular Medical Microbiology, Chair of Microbiology, Faculty of Medicine, Jagiellonian University Medical College, 31-121 Krakow, Poland
- Correspondence: (A.S.-O.); (T.B.); (M.B.-W.); Tel.: +48-1263-308-77 (A.S.-O.); +48-52-585-44-80 (T.B.); +48-1263-325-67 (M.B.-W.)
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Savcheniuk MO, Tarasov OA, Zakharova OM, Korniienko LY, Zotsenko VM, Tsarenko TM. Detection of Streptococcus suis using the optimized real-time polymerase chain reaction protocol. REGULATORY MECHANISMS IN BIOSYSTEMS 2022. [DOI: 10.15421/022221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
The article presents the results of studies on the detection of Streptococcus suis by real-time polymerase chain reaction. Isolation and species identification of the studied isolates of streptococci was carried out according to morphological, cultural, biochemical and biological properties by conventional methods. The study of cultural characteristics of growth was carried out using conventional bacteriological methods on the brain heart infusion broth (BHI) and BHI agar with the addition of 5% sheep blood (blood BHI agar). To confirm biochemical properties as a confirmatory method, API 20 STREP test kit (bioMerieux, France) was used. In addition, to differentiate S. suis from the non-pathogenic species of streptococci, the hemolysis test was used. As a result of the studies, it was found that the use of the real-time PCR (polymerase chain reaction) method makes it possible to detect S. suis in an amount of 1 x 104 genome copies in the sample. All described validation parameters for the qualitative detection of S. suis DNA by real-time PCR meet international requirements, which guarantees accurate and reliable results. In Ukraine only a diagnostic test kit for convential PCR has been developed for the detection of swine streptococcosis. This approach is more time consuming and complex in comparison with the real-time PCR approach. We recommend that diagnostic laboratories implement this method in their practice. This will increase the number of effective diagnostic tools available to veterinarians on pig farms when they order laboratory tests. The high analytical sensitivity limit of a test is an essential parameter when screening is the focus, and obtaining false negative results causes a risk of the development of infection process among pig populations within infected herds. Our study showed that microbiological diagnostic methods to determine morphological and cultural properties can identify S. suis at the genus level. Determination of biochemical properties using the API 20 STREP test kit can be used to identify S. suis 1 and 2 serotypes. The conventional method and real-time PCR have 100% specificity and can be used to identify S. suis of different serotypes. Real-time PCR is a 2 to 4 times more sensitive limit than conventional PCR depending on the serotype being studied, and can be used to more accurately identify streptococcal DNA. It was found that the use of the real-time PCR method makes it possible to detect S. suis in an amount of 1 x 104 copies of the genome in the sample. Additionally, it was found that all the studied validation parameters of the qualitative method for determining S. suis DNA by real-time PCR meet international requirements, which guarantees accurate and reliable results.
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Jury I, Thompson K, Hirst JE. A scoping review of maternal antibiotic prophylaxis in low- and middle-income countries: Comparison to WHO recommendations for prevention and treatment of maternal peripartum infection. Int J Gynaecol Obstet 2021; 155:319-330. [PMID: 33608872 DOI: 10.1002/ijgo.13648] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2020] [Revised: 02/09/2021] [Accepted: 02/18/2021] [Indexed: 11/09/2022]
Abstract
BACKGROUND Sepsis is a leading cause of maternal death. Antimicrobials save lives, but inappropriate overuse increases risk of antimicrobial resistance. OBJECTIVE A scoping review comparing peripartum prophylactic antimicrobial use in low- and middle-income countries (LMICs) with WHO recommendations for prevention and treatment of maternal peripartum infection. SEARCH STRATEGY Medline, Embase, Global Health, LILACS and the WHO Library databases were searched. SELECTION CRITERIA Publications from LMICs since 2015 describing maternal prophlyactic antibiotics for group B streptococcus (GBS), preterm-prelabor rupture of membranes (PPROM), cesarean section, manual placental removal, and third/fourth-degree perineal tears. DATA COLLECTION AND ANALYSIS Publications were screened, and duplicates were removed. A scoping review was conducted using PRISMA guidelines. Owing to study heterogeneity, a narrative synthesis was performed. MAIN RESULTS Of 1886 studies, 27 studies from 13 countries involving 43 774 women met the eligibility criteria. Polymerase chain reaction screening for GBS is feasible, though limited financially. In PPROM, up to 42% of GBS isolates demonstrated erythromycin resistance. Evidence around cesarean section antimicrobial prophylaxis largely supports WHO recommendations; however, prolonged or multidrug regimens were reported. CONCLUSION There is limited evidence to challenge current WHO recommendations to prevent peripartum infection in LMICs. However, implementation challenges exist. Given the emergence of antimicrobial resistance, research is needed to ensure that peripartum prophylactic antimicrobial choices remain effective.
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Affiliation(s)
- Imogen Jury
- Medical Sciences Division, University of Oxford Medical School, Oxford, UK
| | - Kelly Thompson
- Global Women's Health Program, The George Institute for Global Health, Sydney, NSW, Australia
| | - Jane E Hirst
- Nuffield Department of Women's & Reproductive Health, University of Oxford, Oxford, UK.,The George Institute for Global Health, Oxford, UK
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Wang YH, Song Z, Hu XY, Wang HS. Circulating tumor DNA analysis for tumor diagnosis. Talanta 2021; 228:122220. [PMID: 33773726 DOI: 10.1016/j.talanta.2021.122220] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2021] [Revised: 02/05/2021] [Accepted: 02/13/2021] [Indexed: 01/10/2023]
Abstract
Tumor is a kind of abnormal organism generated by the proliferation and differentiation of cells in the body under the action of various initiating and promoting factors, which seriously threatens human life and health. Tumorigenesis is a gradual process that involves multistage reactions and the accumulation of mutations. Gene mutation usually occurs during tumorigenesis, and can be used for tumor diagnosis. Early diagnosis is the most effective way to improve the cure rate and reduce the mortality rate. Among the peripheral blood circulating tumor DNA (ctDNA), gene mutation in keeping with tumor cells can be detected, which can potentially replace tumor tissue section for early diagnosis. It has been considered as a liquid biopsy marker with good clinical application prospect. However, the high fragmentation and low concentration of ctDNA in blood result in the difficulty of tumor stage determination. Therefore, high sensitive and specific mutation detection methods have been developed to detect trace mutant ctDNA. At present, the approaches include digital PCR (dPCR), Bead, Emulsion, Amplification and Magnetic (BEAMing), Next Generation Sequencing (NGS), Amplification Refractory Mutation System (ARMS), etc. In this paper, the principle, characteristics, latest progress and application prospects of these methods are reviewed, which will facilitate researchers to choose appropriate ctDNA detection approaches.
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Affiliation(s)
- Yi-Hui Wang
- Key Laboratory of Drug Quality Control and Pharmacovigilance (Ministry of Education), China Pharmaceutical University, Nanjing, 210009, China; Department of Pharmaceutical Analysis, China Pharmaceutical University, Nanjing, 210009, China
| | - Zhen Song
- Key Laboratory of Drug Quality Control and Pharmacovigilance (Ministry of Education), China Pharmaceutical University, Nanjing, 210009, China; Department of Pharmaceutical Analysis, China Pharmaceutical University, Nanjing, 210009, China
| | - Xin-Yuan Hu
- Key Laboratory of Drug Quality Control and Pharmacovigilance (Ministry of Education), China Pharmaceutical University, Nanjing, 210009, China; Department of Pharmaceutical Analysis, China Pharmaceutical University, Nanjing, 210009, China
| | - Huai-Song Wang
- Key Laboratory of Drug Quality Control and Pharmacovigilance (Ministry of Education), China Pharmaceutical University, Nanjing, 210009, China; Department of Pharmaceutical Analysis, China Pharmaceutical University, Nanjing, 210009, China.
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Geteneh A, Kassa T, Alemu Y, Alemu D, Kiros M, Andualem H, Abebe W, Alemayehu T, Alemayehu DH, Mihret A, Mulu A, Mihret W. Enhanced identification of Group B streptococcus in infants with suspected meningitis in Ethiopia. PLoS One 2020; 15:e0242628. [PMID: 33211777 PMCID: PMC7676702 DOI: 10.1371/journal.pone.0242628] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Accepted: 11/05/2020] [Indexed: 12/22/2022] Open
Abstract
Meningitis is one of the top ten causes of death among Ethiopian infants. Group B streptococcus (GBS) has emerged as a leading cause of meningitis in neonates and young infants, resulting in high mortality. Despite this, there is no report on GBS associated meningitis in Ethiopia where infant meningitis is common. Hence, the aim of this study was to determine the proportion of GBS associated meningitis among Ethiopian infants. PCR was prospectively used to detect GBS in culture-negative cerebrospinal fluid (CSF) samples, which were collected from infants suspected for meningitis, at Tikur Anbessa specialized hospital, Ethiopia, over a one-year period. GBS was detected by PCR in 63.9% of culture-negative CSF samples. Out of the 46 GBS positive infants, 10.9% (n = 5) of them died. The late onset of GBS (LOGBS) disease was noted to have a poor outcome with 3 LOGBS out of 5 GBS positive samples collected from patients with the final outcome of death. PCR was advantageous in the identification of GBS in culture-negative CSF samples. GBS was detected in 64% of the CSF samples from infants with meningitis compared with zero-detection rate by culture.
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Affiliation(s)
- Alene Geteneh
- Department of Medical Laboratory Science, College of Health Science, Woldia University, Woldia, Ethiopia
- * E-mail:
| | - Tesfaye Kassa
- School of Medical Laboratory Science, Jimma University, Jimma, Ethiopia
| | - Yared Alemu
- School of Medical Laboratory Science, Jimma University, Jimma, Ethiopia
| | - Derbie Alemu
- Arba Minch College of Health Science, Arba Minch, Ethiopia
| | - Mulugeta Kiros
- Department of Medical Laboratory Science, College of Health Science, Debre Tabor University, Debre Tabor, Ethiopia
| | - Henok Andualem
- Department of Medical Laboratory Science, College of Health Science, Debre Tabor University, Debre Tabor, Ethiopia
| | - Workeabeba Abebe
- School of Medicine, Addis Ababa University, Addis Ababa, Ethiopia
| | - Tinsae Alemayehu
- School of Medicine, Addis Ababa University, Addis Ababa, Ethiopia
| | | | - Adane Mihret
- Armauer Hanson Research Institute, Addis Ababa, Ethiopia
| | | | - Wude Mihret
- Armauer Hanson Research Institute, Addis Ababa, Ethiopia
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Development of a droplet digital PCR method for detection of Streptococcus agalactiae. BMC Microbiol 2020; 20:179. [PMID: 32576134 PMCID: PMC7310480 DOI: 10.1186/s12866-020-01857-w] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2019] [Accepted: 06/15/2020] [Indexed: 12/13/2022] Open
Abstract
Background Streptococcus agalactiae (GBS) is the causative pathogen of puerperal sepsis in pregnant women and pneumonia, sepsis and meningitis in infants. Infection of GBS is responsible for the increased morbidity in pregnant women and the elderly, and bring challenges to clinical diagnosis and treatment. However, culture-based approaches to detect S.agalactiae is time-consuming with limited sensitivity. Besides, real-time quantitative PCR demands expensive instruments with tedious steps. Thus, we aim to establish a new detection method for more accurate and rapid detection of S.agalactiae. Results The ddPCR primer targeted the CpsE gene showed better amplified efficiency in the reaction. The limit of detection for GBS DNA with ddPCR was able to reach 5 pg/μL. Moreover, no positive amplified signals could be detected in the reactions which served 11 non-GBS strains DNA as templates. Furthermore, the coefficient of variation of this method was 4.5%, indicating excellent repeatability of ddPCR assay. Conclusions In our study, ddPCR was performed as a rapid detection of S.agalactiae with high sensitivity and specificity. This technique can promote the accuracy of the diagnosis of GBS infection and provide a scientific basis for clinical treatment.
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