1
|
Kitaura S, Okamoto K, Wakabayashi Y, Okada Y, Okazaki A, Ikeda M, Okugawa S, Fujimoto F, Bujo C, Minatsuki S, Tsushima K, Chikamatsu K, Mitarai S, Moriya K. A cold-blooded tiptoer: non-resolving cellulitis in an immunocompromised patient. Open Forum Infect Dis 2022; 9:ofac074. [PMID: 35308485 PMCID: PMC8926000 DOI: 10.1093/ofid/ofac074] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2021] [Accepted: 02/10/2022] [Indexed: 11/23/2022] Open
Abstract
Mycobacterium haemophilum is a nontuberculous mycobacteria (NTM) with a predilection for skin and soft tissue infection (SSTI) in the immunocompromised host. We report a case of disseminated M haemophilum infection initially presenting as a nonresolving subacute cellulitis of bilateral lower extremities. Genetic sequencing was used for final identification, while a commercially available polymerase chain reaction test returned a false-positive result for Mycobacterium intracellulare. Consequently, we highlight the importance of M haemophilum as a major differential diagnosis of SSTI in the immunocompromised host and the need for careful interpretation of rapid diagnostic tests.
Collapse
Affiliation(s)
- Satoshi Kitaura
- Department of Infectious Diseases, The University of Tokyo Hospital, Tokyo, Japan
| | - Koh Okamoto
- Department of Infectious Diseases, The University of Tokyo Hospital, Tokyo, Japan
| | | | - Yuta Okada
- Department of Infectious Diseases, The University of Tokyo Hospital, Tokyo, Japan
| | - Aiko Okazaki
- Department of Infectious Diseases, The University of Tokyo Hospital, Tokyo, Japan
| | - Mahoko Ikeda
- Department of Infectious Diseases, The University of Tokyo Hospital, Tokyo, Japan
| | - Shu Okugawa
- Department of Infectious Diseases, The University of Tokyo Hospital, Tokyo, Japan
| | - Fumie Fujimoto
- Department of Infection Control and Prevention, The University of Tokyo Hospital, Tokyo, Japan
| | - Chie Bujo
- Department of Cardiovascular Medicine, Graduate School of Medicine, The University of Tokyo, Japan
| | - Shun Minatsuki
- Department of Cardiovascular Medicine, Graduate School of Medicine, The University of Tokyo, Japan
| | - Kensuke Tsushima
- Department of Cardiovascular Medicine, Graduate School of Medicine, The University of Tokyo, Japan
| | - Kinuyo Chikamatsu
- Department of Mycobacterium Reference and Research, The Research Institute of Tuberculosis, Japan Anti-tuberculosis Association, Tokyo, Japan
| | - Satoshi Mitarai
- Department of Mycobacterium Reference and Research, The Research Institute of Tuberculosis, Japan Anti-tuberculosis Association, Tokyo, Japan
| | - Kyoji Moriya
- Department of Infectious Diseases, The University of Tokyo Hospital, Tokyo, Japan
| |
Collapse
|
2
|
Chen C, Lu J, Long B, Rao Z, Gao Y, Wang W, Gao W, Yang J, Zhang S. Detection of Mycobacterium kansasii using a combination of loop-mediated isothermal amplification (LAMP) and lateral flow biosensors. Int Microbiol 2020; 24:75-82. [PMID: 32880033 PMCID: PMC7872997 DOI: 10.1007/s10123-020-00143-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2019] [Revised: 08/09/2020] [Accepted: 08/28/2020] [Indexed: 12/17/2022]
Abstract
Mycobacterium kansasii is an opportunistic pathogen that causes both intrapulmonary and extrapulmonary infections. The symptoms of the pulmonary diseases caused by M. kansasii closely resemble Mycobacterium tuberculosis. Rapid and accurate differentiation of M. kansasii from M. tuberculosis, as well as other mycobacteria, is crucial for developing effective therapeutics and disease treatment. In this study, we combined loop-mediated isothermal amplification (LAMP) with lateral flow biosensors (LFB) to detect M. kansasii, by targeting the species-specific sequence of rpoB, a gene which encodes the β subunit of bacterial RNA polymerase. The assay was validated to ensure that it was highly selective by testing M. kansasii, M. tuberculosis, other species of respiratory bacteria, and other nontuberculous mycobacteria. The detection limit of the assay was 1 fg/μL of DNA and 50 CFU of bacilli in sputum. The M. kansasii-LAMP-LFB assay is a fast, cheap, and accurate method for detecting M. kansasii by constant temperature amplification and simple interpretation.
Collapse
Affiliation(s)
- Chuang Chen
- Sichuan Center for Disease Control and Prevention, Chengdu, 610041, Sichuan Province, China
| | - Jia Lu
- Sichuan Center for Disease Control and Prevention, Chengdu, 610041, Sichuan Province, China
| | - Bo Long
- Sichuan Center for Disease Control and Prevention, Chengdu, 610041, Sichuan Province, China
| | - Zhengyuan Rao
- Sichuan Center for Disease Control and Prevention, Chengdu, 610041, Sichuan Province, China
| | - Yuan Gao
- Sichuan Center for Disease Control and Prevention, Chengdu, 610041, Sichuan Province, China
| | - Weina Wang
- Sichuan Center for Disease Control and Prevention, Chengdu, 610041, Sichuan Province, China
| | - Wenfeng Gao
- Sichuan Center for Disease Control and Prevention, Chengdu, 610041, Sichuan Province, China
| | - Jun Yang
- Sichuan Center for Disease Control and Prevention, Chengdu, 610041, Sichuan Province, China
| | - Shu Zhang
- Sichuan Center for Disease Control and Prevention, Chengdu, 610041, Sichuan Province, China.
| |
Collapse
|
3
|
Huh HJ, Kim SY, Jhun BW, Shin SJ, Koh WJ. Recent advances in molecular diagnostics and understanding mechanisms of drug resistance in nontuberculous mycobacterial diseases. INFECTION GENETICS AND EVOLUTION 2018; 72:169-182. [PMID: 30315892 DOI: 10.1016/j.meegid.2018.10.003] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2018] [Revised: 10/08/2018] [Accepted: 10/09/2018] [Indexed: 01/31/2023]
Abstract
Accumulating evidence suggests that human infections caused by nontuberculous mycobacteria (NTM) are increasing worldwide, indicating that NTM disease is no longer uncommon in many countries. As a result of an increasing emphasis on the importance of differential identification of NTM species, several molecular tools have recently been introduced in clinical and experimental settings. These advances have led to a much better understanding of the diversity of NTM species with regard to clinical aspects and the potential factors responsible for drug resistance that influence the different outcomes of NTM disease. In this paper, we review currently available molecular diagnostics for identification and differentiation of NTM species by summarizing data from recently applied methods, including commercially available assays, and their relevant strengths and weaknesses. We also highlight drug resistance-associated genes in clinically important NTM species. Understanding the basis for different treatment outcomes with different causative species and drug-resistance mechanisms will eventually improve current treatment regimens and facilitate the development of better control measures for NTM diseases.
Collapse
Affiliation(s)
- Hee Jae Huh
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
| | - Su-Young Kim
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
| | - Byung Woo Jhun
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
| | - Sung Jae Shin
- Department of Microbiology, Institute for Immunology and Immunological Disease, Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, South Korea.
| | - Won-Jung Koh
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea.
| |
Collapse
|
4
|
Jung YJ, Kim JY, Song DJ, Koh WJ, Huh HJ, Ki CS, Lee NY. Evaluation of three real-time PCR assays for differential identification of Mycobacterium tuberculosis complex and nontuberculous mycobacteria species in liquid culture media. Diagn Microbiol Infect Dis 2016; 85:186-91. [PMID: 27105774 DOI: 10.1016/j.diagmicrobio.2016.03.014] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2015] [Revised: 03/02/2016] [Accepted: 03/13/2016] [Indexed: 11/29/2022]
Abstract
We evaluated the analytical performance of M. tuberculosis complex (MTBC)/nontuberculous mycobacteria (NTM) PCR assays for differential identification of MTBC and NTM using culture-positive liquid media. Eighty-five type strains and 100 consecutive mycobacterial liquid media cultures (MGIT 960 system) were analyzed by a conventional PCR assay (MTB-ID(®) V3) and three real-time PCR assays (AdvanSure™ TB/NTM real-time PCR, AdvanSure; GENEDIA(®) MTB/NTM Detection Kit, Genedia; Real-Q MTB & NTM kit, Real-Q). The accuracy rates for reference strains were 89.4%, 100%, 98.8%, and 98.8% for the MTB-ID V3, AdvanSure, Genedia, and Real-Q assays, respectively. Cross-reactivity in the MTB-ID V3 assay was mainly attributable to non-mycobacterium Corynebacterineae species. The diagnostic performance was determined using clinical isolates grown in liquid media, and the overall sensitivities for all PCR assays were higher than 95%. In conclusion, the three real-time PCR assays showed better performance in discriminating mycobacterium species and non-mycobacterium Corynebacterineae species than the conventional PCR assay.
Collapse
Affiliation(s)
- Yu Jung Jung
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
| | - Ji-Youn Kim
- Center for Clinical Medicine, Samsung Biomedical Research Institute, Samsung Medical Center, Seoul, Republic of Korea
| | - Dong Joon Song
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
| | - Won-Jung Koh
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
| | - Hee Jae Huh
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea.
| | - Chang-Seok Ki
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea.
| | - Nam Yong Lee
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
| |
Collapse
|
5
|
Lecuona M, Abreu R, Rodríguez-Álvarez C, Castro B, Campos S, Hernández-Porto M, Mendoza P, Arias A. First isolation of Mycobacterium canariasense from municipal water supplies in Tenerife, Canary Islands, Spain. Int J Hyg Environ Health 2015; 219:48-52. [PMID: 26324115 DOI: 10.1016/j.ijheh.2015.08.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2015] [Revised: 08/16/2015] [Accepted: 08/17/2015] [Indexed: 01/13/2023]
Abstract
BACKGROUND Nontuberculous mycobacteria (NTM) are common bacteria in water and especially water supply distribution systems. Some species can cause infections, especially in immunocompromised patients and other risk groups. This study examined the frequency of occurrence of NTM in 135 household potable water samples collected from household water taps in Tenerife Island. METHODS Mycobacteria species were identified by polymerase chain reaction targeting the 16S rRNA and 16S-23S rRNA regions, and by double-reverse hybridization on a dipstick using colloidal gold-bound and membrane-bound probes (Speed-Oligo(®) Mycobacteria). Some species were identified by sequencing the gene that encodes the 16S rRNA region. RESULTS NTM were present in 47.4% of the samples. Mycobacterium fortuitum was the NTM isolated most frequently (70.3%), followed by Mycobacterium canariasense (6.3%) and Mycobacterium chelonae (6.3%). Other species were isolated at lower percentage frequencies. CONCLUSION We isolated and identified the species M. canariasense in water supplies for public consumption. This species has previously been reported only in hospital settings. The elevated presence of NTM in the water supply indicates that it may be a reservoir for infections caused by recently described species of mycobacteria.
Collapse
Affiliation(s)
- María Lecuona
- University Hospital of Canary Islands, Tenerife, Ofra, s/n 38320, San Cristóbal de La Laguna, Canary Islands, Spain; Preventive Medicine and Public Health, University of La Laguna, Santa Cruz de Tenerife 38071, Canary Islands, Spain
| | - Rossana Abreu
- University Hospital of Canary Islands, Tenerife, Ofra, s/n 38320, San Cristóbal de La Laguna, Canary Islands, Spain; Preventive Medicine and Public Health, University of La Laguna, Santa Cruz de Tenerife 38071, Canary Islands, Spain
| | | | - Beatriz Castro
- University Hospital of Canary Islands, Tenerife, Ofra, s/n 38320, San Cristóbal de La Laguna, Canary Islands, Spain
| | - Silvia Campos
- University Hospital of Canary Islands, Tenerife, Ofra, s/n 38320, San Cristóbal de La Laguna, Canary Islands, Spain
| | - Miriam Hernández-Porto
- University Hospital of Canary Islands, Tenerife, Ofra, s/n 38320, San Cristóbal de La Laguna, Canary Islands, Spain
| | - Pablo Mendoza
- Vircell S.L. Molecular Diagnostic Department, The Technology Park of Health Sciences, Granada, Spain
| | - Angeles Arias
- Preventive Medicine and Public Health, University of La Laguna, Santa Cruz de Tenerife 38071, Canary Islands, Spain.
| |
Collapse
|
6
|
Ramis IB, Cnockaert M, Von Groll A, Mathys V, Simon A, Tortoli E, Palomino JC, Almeida da Silva PE, Vandamme P, Andre E, Martin A. Evaluation of the Speed-Oligo Mycobacteria assay for the identification of nontuberculous mycobacteria. J Med Microbiol 2015; 64:283-287. [PMID: 25596120 DOI: 10.1099/jmm.0.000025] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Nontuberculous mycobacteria (NTM) causing human infectious disease have become increasingly common. Rapid and accurate identification to the species level is, therefore, critical. The Speed-Oligo Mycobacteria assay is an oligochromatographic method that was made available recently for the identification and differentiation of mycobacteria. The present study aimed to evaluate the performance of the Speed-Oligo Mycobacteria assay for the identification of NTM. We examined a total of 62 strains (9 type strains, 19 reference strains and 34 clinical isolates) belonging to 13 different species (Mycobacterium intracellulare, M. fortuitum, M. gordonae, M. kansasii, M. marinum, M. peregrinum, M. scrofulaceum, M. abscessus, M. bovis BCG, M. chelonae, M. avium, M. malmoense and M. xenopi). The Speed-Oligo Mycobacteria assay was performed according to the manufacturer's instructions. Discrepant results between Speed-Oligo Mycobacteria and the original identification were reassessed by the Speed-Oligo Mycobacteria assay and resolved by the GenoType Mycobacterium CM assay and by sequencing of 16S rRNA and protein-encoding genes. We found 93.5 % (58/62) concordance for the identification of NTM as compared with the original identification. Three strains were erroneously identified by Speed-Oligo Mycobacteria: one M. kansasii strain was identified as Mycobacterium tuberculosis complex, and one M. chelonae strain and one M. peregrinum strain were both identified as Mycobacterium abscessus. Moreover, one M. chelonae strain was not identified by Speed-Oligo Mycobacteria since it did not react with any species-specific probe. For these strains, sequencing of the genes hsp65, 16S rRNA and rpoB and the GenoType Mycobacterium CM assay were performed. The Speed-Oligo Mycobacteria assay can be a useful tool for the rapid and easy identification of the most common NTM. If applied in clinical practice it could reduce diagnostic delays and contribute to correct clinical and better management of infections caused by NTM.
Collapse
Affiliation(s)
- Ivy Bastos Ramis
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Ghent University, Gent, Belgium.,Centro de Desenvolvimento Tecnológico (CDTec), Universidade Federal de Pelotas, Pelotas, Brazil
| | - Margo Cnockaert
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Ghent University, Gent, Belgium
| | - Andrea Von Groll
- Laboratório de Micobacteriologia, Faculdade de Medicina, Universidade Federal do Rio Grande, Rio Grande, Brazil
| | - Vanessa Mathys
- Scientific Institute of Public Health, Brussels, WIV-ISP, Belgium
| | - Anne Simon
- Pôle de Microbiologie, Institut de Recherche Expérimentale et Clinique, UC Louvain, Brussels, Belgium
| | - Enrico Tortoli
- Emerging Bacterial Pathogens Unit, San Raffaele Scientific Institute, Milano, Italy
| | - Juan Carlos Palomino
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Ghent University, Gent, Belgium
| | - Pedro Eduardo Almeida da Silva
- Laboratório de Micobacteriologia, Faculdade de Medicina, Universidade Federal do Rio Grande, Rio Grande, Brazil.,Centro de Desenvolvimento Tecnológico (CDTec), Universidade Federal de Pelotas, Pelotas, Brazil
| | - Peter Vandamme
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Ghent University, Gent, Belgium
| | - Emmanuel Andre
- Pôle de Microbiologie, Institut de Recherche Expérimentale et Clinique, UC Louvain, Brussels, Belgium
| | - Anandi Martin
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Ghent University, Gent, Belgium
| |
Collapse
|
7
|
Evaluation of performance of the Real-Q NTM-ID kit for rapid identification of eight nontuberculous mycobacterial species. J Clin Microbiol 2014; 52:4053-5. [PMID: 25165078 DOI: 10.1128/jcm.01957-14] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
We evaluated a multiplex real-time PCR and melting curve analysis assay (Real-Q NTM-ID kit; Biosewoom, Seoul, South Korea) for the identification of eight common nontuberculous mycobacterial species, using 30 type strains and 230 consecutive clinical isolates. The concordance rate of this assay with multigene sequence-based typing was 97.0% (223/230 isolates).
Collapse
|
8
|
|
9
|
de Toro-Peinado I, Fernández-Sánchez AM, Bermúdez-Ruiz MP, Palop-Borrás B. Evaluación del test Speed-oligo® Mycobacteria para la identificación de micobacterias no tuberculosas. Enferm Infecc Microbiol Clin 2013; 31:63-4. [DOI: 10.1016/j.eimc.2012.05.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2012] [Revised: 05/01/2012] [Accepted: 05/03/2012] [Indexed: 10/27/2022]
|
10
|
Evaluation of the speed-oligo direct Mycobacterium tuberculosis assay for molecular detection of mycobacteria in clinical respiratory specimens. J Clin Microbiol 2012; 51:77-82. [PMID: 23100355 DOI: 10.1128/jcm.00533-12] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
We present the first evaluation of a novel molecular assay, the Speed-oligo Direct Mycobacterium tuberculosis (SO-DMT) assay, which is based on PCR combined with a dipstick for the detection of mycobacteria and the specific identification of M. tuberculosis complex (MTC) in respiratory specimens. A blind evaluation was carried out in two stages: first, under experimental conditions on convenience samples comprising 20 negative specimens, 44 smear- and culture-positive respiratory specimens, and 11 sputa inoculated with various mycobacterium-related organisms; and second, in the routine workflow of 566 fresh respiratory specimens (4.9% acid-fast bacillus [AFB] smear positives, 7.6% MTC positives, and 1.8% nontuberculous mycobacteria [NTM] culture positives) from two Mycobacterium laboratories. SO-DMT assay showed no reactivity in any of the mycobacterium-free specimens or in those with mycobacterium-related organisms. Compared to culture, the sensitivity in the selected smear-positive specimens was 0.91 (0.92 for MTC and 0.90 for NTM), and there was no molecular detection of NTM in a tuberculosis case or vice versa. With respect to culture and clinical data, the sensitivity, specificity, and positive and negative predictive values for the SO-DMT system in routine specimens were 0.76 (0.93 in smear positives [1.0 for MTC and 0.5 for NTM] and 0.56 in smear negatives [0.68 for MTC and 0.16 for NTM]), 0.99, 0.85 (1.00 in smear positives and 0.68 in smear negatives), and 0.97, respectively. Molecular misidentification of NTM cases occurred when testing 2 gastric aspirates from two children with clinically but not microbiologically confirmed lung tuberculosis. The SO-DMT assay appears to be a fast and easy alternative for detecting mycobacteria and differentiating MTC from NTM in smear-positive respiratory specimens.
Collapse
|
11
|
Perng CL, Chen HY, Chiueh TS, Wang WY, Huang CT, Sun JR. Identification of non-tuberculous mycobacteria by real-time PCR coupled with a high-resolution melting system. J Med Microbiol 2012; 61:944-951. [PMID: 22493281 DOI: 10.1099/jmm.0.042424-0] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Non-tuberculous mycobacteria (NTM) are increasingly important opportunistic pathogens responsible for a variety of clinical diseases. The aim of this study was to evaluate a novel technique, real-time PCR coupled with high-resolution melting analysis (real-time PCR-HRMA), for NTM identification. Two pairs of unique primers targeted to the 16S rRNA gene and the 16S-23S internal transcribed spacer region were selected for further evaluation. A total of 149 mycobacterial clinical isolates were subjected to analysis using the real-time PCR-HRMA system. Overall, 134 NTM identified by the 16S rRNA full-gene sequencing method were categorized into four major groups: Mycobacterium avium complex, Mycobacterium chelonae group, Mycobacterium gordonae and Mycobacterium fortuitum group. Of the 134 prevalent mycobacterial isolates, 101 mycobacteria (75.4 %) could be identified correctly by the real-time PCR-HRMA system. The individual sensitivities for the M. avium complex, M. chelonae group, M. gordonae and M. fortuitum groups were 90.9, 89.1, 100 and 36.8 %, respectively. The specificity of identifying these groups varied from 96.4 to 100 %. When identification failed, mostly it was attributable to various species in the M. fortuitum group. The real-time PCR-HRMA system is therefore a rapid and sensitive method for identifying prevalent NTM in a clinical laboratory.
Collapse
Affiliation(s)
- Cherng-Lih Perng
- Graduate Institute of Pathology, National Defense Medical Center, Taipei, Taiwan, ROC.,Division of Clinical Pathology, Department of Pathology, Tri-Service General Hospital and National Defense Medical Center, Taipei, Taiwan, ROC
| | - Hsing-Yu Chen
- Department of Clinical Pathology, Taipei City Hospital Renai Branch, Taipei, Taiwan, ROC
| | - Tzong-Shi Chiueh
- Graduate Institute of Medical Science, National Defense Medical Center, Taipei, Taiwan, ROC.,Division of Clinical Pathology, Department of Pathology, Tri-Service General Hospital and National Defense Medical Center, Taipei, Taiwan, ROC
| | - Wei-Yao Wang
- Division of Infectious Disease, Fong-Yuan Hospital, Taichung, Taiwan, ROC.,Graduate Institute of Medical Science, National Defense Medical Center, Taipei, Taiwan, ROC
| | - Chun-Ting Huang
- Division of Clinical Pathology, Department of Pathology, Tri-Service General Hospital and National Defense Medical Center, Taipei, Taiwan, ROC
| | - Jun-Ren Sun
- Graduate Institute of Medical Science, National Defense Medical Center, Taipei, Taiwan, ROC.,Division of Clinical Pathology, Department of Pathology, Tri-Service General Hospital and National Defense Medical Center, Taipei, Taiwan, ROC
| |
Collapse
|
12
|
Hofmann-Thiel S, Turaev L, Alnour T, Drath L, Müllerova M, Hoffmann H. Multi-centre evaluation of the speed-oligo Mycobacteria assay for differentiation of Mycobacterium spp. in clinical isolates. BMC Infect Dis 2011; 11:353. [PMID: 22182531 DOI: 10.1186/1471-2334-11-353] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2011] [Accepted: 12/19/2011] [Indexed: 01/15/2023] Open
Abstract
BACKGROUND A new DNA line probe assay (Speed-oligo Mycobacteria, Vircell) has been launched for rapid differentiation of Mycobacterium spp. from cultures. Compared to other line-probe assays, Speed-oligo Mycobacteria covers a relatively limited spectrum of species but uses a simpler and faster dip-stick technique. The present multi-centre, multi-country study aimed at evaluating the utility and usability of Speed-oligo Mycobacteria in routine mycobacteriology diagnostics. Results from Speed-oligo Myobacteria were compared to those from Genotype CM (HAIN lifescience, Nehren, Germany), another line-probe assay. METHODS Speed-oligo Mycobacteria assay was performed in three main steps: 1) DNA extraction from cultured material 2) PCR amplification of the target gene and an internal control and 3) hybridization of the PCR products to specific probes by means of a dip-stick. RESULTS Two hundred forty-two clinical isolates were recovered from consecutive positive mycobacterial cultures at two German (IML Gauting, Bioscientia Ingelheim), one Czech (KLINLAB Prague), and at a Sudanese (Khartoum) laboratory. All Mycobacterium species covered by the assay were reliably recognized. The rate of false positive results was 1.2% and concerned only the species M. marinum and M. peregrinum. The identification rate, i.e. the proportion of isolates which was correctly differentiated to the level of species or complex by the assay, differed significantly among laboratories being 94.9%, 90.7%, and 75.0% at the study sites IML Gauting, KLINLAB Prague and Bioscientia Ingelheim, respectively. This difference was caused by different spectra of NTM species encountered by the laboratory centres in daily routine diagnostics. CONCLUSIONS Speed-oligo Mycobacteria assay was proved a rapid and easy-to-perform alternative to conventional line-probe assays. The assay showed excellent sensitivity with regard to identification of genus Mycobacterium and species/complexes covered by the test. However, due to its relatively limited spectrum of taxa, a varying proportion of NTM may not be identified by the assay in daily diagnostics demanding further analyses. The only significant shortcoming in terms of specificity was the misidentification of the clinically relevant species M. marinum.
Collapse
Affiliation(s)
- Sabine Hofmann-Thiel
- IML red GmbH & synlab Gauting, Supranational Reference Laboratory of Tuberculosis, c/o Asklepios Fachkliniken, Robert-Koch-Allee 2, Gauting, Germany
| | | | | | | | | | | |
Collapse
|
13
|
Sánchez-Yebra W, Ávila-Carrillo JA, Giménez-Sánchez F, Reyes-Bertos A, Sánchez-Forte M, Morales-Torres M, Rojas A, Mendoza J. Viral agents causing lower respiratory tract infections in hospitalized children: evaluation of the Speed-Oligo® RSV assay for the detection of respiratory syncytial virus. Eur J Clin Microbiol Infect Dis 2011; 31:243-50. [PMID: 21647616 PMCID: PMC7088155 DOI: 10.1007/s10096-011-1300-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2011] [Accepted: 05/15/2011] [Indexed: 11/01/2022]
Abstract
Respiratory syncytial virus (RSV) is the viral agent which is more frequently involved in lower respiratory tract infections (LRTIs) in infants under 1 year of age in developed countries. A new oligochromatographic assay, Speed-Oligo® RSV, was designed and optimized for the specific detection and identification of RSV subtypes A and B. The test was evaluated in 289 clinical samples from 169 hospitalized children using an immunochromatography (IC) test, virus isolation by culture, and an in-house real-time polymerase chain reaction (RT-PCR). Other viruses causing LRTIs were investigated by cell culture or PCR-based tests. Sixty-two patients were infected by RSV (36.7%). In addition, adenovirus, influenza B, parainfluenza 2, and human metapneumovirus were detected in rates ranging from 5 to 8%. A proportion of 10.1% of the patients had mixed infections. The sensitivity, specificity, and positive and negative predictive values were, respectively, 94.9, 99.4, 98.9, and 97.4% for Speed-Oligo® RSV, 92.9, 96.3, 92.9, and 96.3% for RT-PCR/RSV, and 58.4, 98.1, 93.3, and 82.6% for IC. Our rates of viral detection and co-infection were similar to those of previously reported series. Finally, we find that Speed-Oligo® RSV is a rapid and easy-to-perform technique for the detection of RSV and the identification of subtypes A and B.
Collapse
Affiliation(s)
- W Sánchez-Yebra
- Department of Microbiology, CH Torrecárdenas, 04009, Almería, Spain.
| | | | | | | | | | | | | | | | | |
Collapse
|