scholarly journals First Food-Borne Cases of Vibrio Parahaemolyticus in Turkey

ANKEM Dergisi ◽  
2021 ◽  
Author(s):  
Nilgün Kansak ◽  
Rıza Adaleti ◽  
Belkıs Levent ◽  
Sebahat Aksaray
Keyword(s):  
Vibrio Parahaemolyticus ◽  
Reference Laboratory ◽  
Seafood Consumption ◽  
Maldi Tof Ms ◽  
Maldi Tof ◽  
Food Borne ◽  
Stool Samples ◽  
Vitek 2 ◽  
Conventional Methods ◽  
Tof Ms

ABSTRACT Vibrio parahaemolyticus (V.parahaemolyticus) is detected in many parts of the world. It is one of the most common causes of food-borne infections in Asian countries and Japan, and is usually seen as minor outbreaks involving less than ten cases. In this study, it is aimed to investigate V.parahaemolyticus in diarrhea cases in our laboratory in order to draw attention to the possible cases of this agent due to the increase in the consumption of shellfish. In the period of July-August 2018; patients who applied to the emergency service of our hospital with gastrointestinal tract infection symptoms following seafood consumption were investigated by stool microscopy and culture as part of routine procedures. Stool samples were cultured on Hektoen enteric agar, MacConkey agar, and sheep blood agar and were incubated at 37°C for 24 hours. After the incubation period, lactose negative and oxidase-positive colonies were identified by classical biochemical tests, VITEK 2 and MALDI-TOF MS (bioMérieux, France). In seven patients aged between 12-59, clinical symptoms associated with gastroenteritidis started after consuming stuffed mussels in four, eating fish in one, and in a patient after consuming fast food. One patient could not be contacted. In the microscopic examination of the macroscopically watery and mucous stool samples, abundant leukocytes in all samples, and abundant erythrocytes in addition to leukocytes in one sample were seen. The bacteria grown in culture were identified as V.parahaemolyticus by conventional methods and automated systems, Vitek 2 with 96 % and MALDITOF MS with 99 % accuracy. The results were also confirmed by the General Directorate of Public Health, National Enteric Pathogens Reference Laboratory by conventional methods, API 20 E and MALDI-TOF MS (BrukerDaltonics, USA). It should be kept in mind that V.parahaemolyticus can be isolated as a cause of gastroenteritis in diarrhea cases during the summer months, especially in the presence of a history of seafood consumption, and further investigations should be performed in this direction.

scholarly journals Candida auris Clinical Isolates from South Korea: Identification, Antifungal Susceptibility, and Genotyping

2019 ◽  
Vol 57 (4) ◽  
Author(s):  
Yong Jun Kwon ◽  
Jong Hee Shin ◽  
Seung A Byun ◽  
Min Ji Choi ◽  
Eun Jeong Won ◽  
...  
Keyword(s):  
Antifungal Susceptibility ◽  
Diagnostic Tools ◽  
Candida Auris ◽  
Content Type ◽  
Maldi Tof Ms ◽  
Maldi Tof ◽  
Fluconazole Resistant ◽  
Vitek 2 ◽  
Vitek Ms ◽  
Tof Ms

ABSTRACT Candida auris is an emerging worldwide fungal pathogen. Over the past 20 years, 61 patient isolates of C. auris (4 blood and 57 ear) have been obtained from 13 hospitals in Korea. Here, we reanalyzed those molecularly identified isolates using two matrix-assisted laser desorption ionization–time of flight mass spectrometry (MALDI-TOF MS) systems, including Biotyper and Vitek MS, followed by antifungal susceptibility testing, sequencing of the ERG11 gene, and genotyping. With a research-use-only (RUO) library, 83.6% and 93.4% of the isolates were correctly identified by Biotyper and Vitek MS, respectively. Using an in vitro diagnostic (IVD) library of Vitek MS, 96.7% of the isolates were correctly identified. Fluconazole-resistant isolates made up 62.3% of the isolates, while echinocandin- or multidrug-resistant isolates were not found. Excellent essential (within two dilutions, 96.7%) and categorical agreements (93.4%) between the Clinical and Laboratory Standards Institute (CLSI) and Vitek 2 (AST-YS07 card) methods were observed for fluconazole. Sequencing ERG11 for all 61 isolates revealed that only 3 fluconazole-resistant isolates showed the Erg11p amino acid substitution K143R. All 61 isolates showed identical multilocus sequence typing (MLST). Pulsed-field gel electrophoresis (PFGE) analyses revealed that both blood and ear isolates had the same or similar patterns. These results show that MALDI-TOF MS and Vitek 2 antifungal susceptibility systems can be reliable diagnostic tools for testing C. auris isolates from Korean hospitals. The Erg11p mutation was seldom found among Korean isolates of C. auris, and multidrug resistance was not found. Both MLST and PFGE analyses suggest that these isolates are genetically similar.

scholarly journals Determination of Drug Efflux Pump Efficiency in Drug-Resistant Bacteria Using MALDI-TOF MS

Antibiotics ◽  
2020 ◽  
Vol 9 (10) ◽  
pp. 639 ◽  
Author(s):  
Wen-Jung Lu ◽  
Hsuan-Ju Lin ◽  
Pang-Hung Hsu ◽  
Hong-Ting Victor Lin
Keyword(s):  
Minimum Inhibitory Concentration ◽  
Inhibitory Concentration ◽  
Resistant Bacteria ◽  
Pump Efficiency ◽  
Drug Efflux ◽  
Maldi Tof Ms ◽  
E Coli ◽  
Maldi Tof ◽  
Conventional Methods ◽  
Tof Ms

Multidrug efflux pumps play an essential role in antibiotic resistance. The conventional methods, including minimum inhibitory concentration and fluorescent assays, to monitor transporter efflux activity might have some drawbacks, such as indirect evidence or interference from color molecules. In this study, MALDI-TOF MS use was explored for monitoring drug efflux by a multidrug transporter, and the results were compared for validation with the data from conventional methods. Minimum inhibitory concentration was used first to evaluate the activity of Escherichia coli drug transporter AcrB, and this analysis showed that the E. coli overexpressing AcrB exhibited elevated resistance to various antibiotics and dyes. Fluorescence-based studies indicated that AcrB in E. coli could decrease the accumulation of intracellular dyes and display various efflux rate constants for different dyes, suggesting AcrB’s efflux activity. The MALDI-TOF MS analysis parameters were optimized to maintain a detection accuracy for AcrB’s substrates; furthermore, the MS data showed that E. coli overexpressing AcrB led to increased ions abundancy of various dyes and drugs in the extracellular space at different rates over time, illustrating continuous substrate efflux by AcrB. This study concluded that MALDI-TOF MS is a reliable method that can rapidly determine the drug pump efflux activity for various substrates.

scholarly journals Identification of cereulide producingBacillus cereusby MALDI-TOF MS

2018 ◽  
Author(s):  
Sebastian Ulrich ◽  
Christoph Gottschalk ◽  
Richard Dietrich ◽  
Erwin Märtlbauer ◽  
Manfred Gareis
Keyword(s):  
Causative Agent ◽  
Food Chain ◽  
Reliable Method ◽  
Correct Identification ◽  
Maldi Tof Ms ◽  
Maldi Tof ◽  
Heat Stable ◽  
Food Borne ◽  
Reliable Methods ◽  
Tof Ms

AbstractTheBacillus(B.)cereusgroup is genetically highly homogenous and consists of nine recognized species which are present worldwide.B. cereussensu stricto play an important role in food-borne diseases by producing different toxins. Yet, only a small percentage ofB. cereusstrains are able to produce the heat stable depsipeptide cereulide, the causative agent of emetic food poisonings. To minimize the entry of emeticB. cereusinto the food chain, food business operators are dependent on efficient and reliable methods enabling the differentiation between emetic and non-emetic strains. Currently, only time-consuming cell bioassays, molecular methods and tandem mass spectrometry are available for this purpose. Thus, the aim of the present study was to establish a fast and reliable method for the differentiation between emetic and non-emetic strains by MALDI-TOF MS. Selected isolates/strains of theB. cereusgroup (total n=110, i.e. emetic n=45, non-emetic n=65) were cultured on sheep blood agar for 48h.Subsequently, the cultures were directly analyzed by MALDI-TOF MS without prior extraction steps (direct smear method). The samples were measured in linear positive ionization mode in the mass range ofm/z800 - 1,800 Da. Using ClinProTools 3.0 statistical software and flex analyst, a differentiation between emetic and non-emetic isolates was possible with a rate of correct identification of 99.1 % by means of the evaluation of two specific biomarkers (m/z1171 and 1187 Da).ImportanceBacillus(B.)cereusplays an important role in food-borne diseases due to the production of different toxins, e.g. the heat stable depsipeptide cereulide. Only a small number ofB. cereusstrains are able to produce this toxin, the causative agent of emetic food poisonings. To minimize the entry of emeticB. cereusinto the food chain, food business operators require efficient and reliable methods enabling the differentiation between emetic and non-emetic strains. The aim of the present study was to develop a fast and reliable method for the differentiation between emetic and non-emetic strains by MALDI-TOF MS. A differentiation between emetic and non-emetic isolates was possible with a rate of correct identification of 99.1 % by means of the evaluation of two specific biomarkers (m/z1171 and 1187 Da).

scholarly journals Misidentification ofCandida guilliermondiiasC. famataamong Strains Isolated from Blood Cultures by the VITEK 2 System

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Si Hyun Kim ◽  
Jeong Hwan Shin ◽  
Jeong Ha Mok ◽  
Shine Young Kim ◽  
Sae Am Song ◽  
...  
Keyword(s):  
Gene Sequencing ◽  
Candida Guilliermondii ◽  
Blood Cultures ◽  
Rrna Gene ◽  
28S Rrna ◽  
Sequencing Analysis ◽  
Maldi Tof Ms ◽  
Maldi Tof ◽  
Vitek 2 ◽  
Tof Ms

Introduction. The aim of this study was to differentiate betweenCandida famataandCandida guilliermondiicorrectly by using matrix-assisted laser desorption/ionization-time of flight mass spectrometry (MALDI-TOF MS) and gene sequencing.Methods. Twenty-eightCandidastrains from blood cultures that had been identified asC. famata(N=25),C. famata/C. guilliermondii(N=2), andC. guilliermondii(N=1) by the VITEK 2 system using the YST ID card were included. We identified these strains by MALDI-TOF MS and gene sequencing using the 28S rRNA andITSgenes and compared the results with those obtained by the VITEK 2 system.Results. All 28 isolates were finally identified asC. guilliermondii.Sequencing analysis of the 28S rRNA gene showed 99.80%–100% similarity withC. guilliermondiifor all 28 strains. TheITSgene sequencing of the strains showed 98.34%–100% homology withC. guilliermondii.By MALDI-TOF, we could correctly identify 21 (75%) of 28C. guilliermondiiisolates.Conclusion. We should suspect misidentification whenC. famatais reported by the VITEK 2 system, and we always should keep in mind the possibility of misidentification of any organism when an uncommon species is reported.

scholarly journals Application of MALDI-TOF MS for the Identification of Food Borne Bacteria

2013 ◽  
Vol 7 (1) ◽  
pp. 135-141 ◽  
Author(s):  
Melanie Pavlovic ◽  
Ingrid Huber ◽  
Regina Konrad ◽  
Ulrich Busch
Keyword(s):  
Associated Bacteria ◽  
Maldi Tof Ms ◽  
Maldi Tof ◽  
Flight Mass Spectrometry ◽  
Current State ◽  
Food Borne ◽  
Routine Identification ◽  
Identification Of Bacteria ◽  
Cost Efficient ◽  
Tof Ms

Matrix-assisted laser desorption ionization-time of flight mass spectrometry (MALDI-TOF MS) has recently emerged as a powerful tool for the routine identification of clinical isolates. MALDI-TOF MS based identification of bacteria has been shown to be more rapid, accurate and cost-efficient than conventional phenotypic techniques or molecular methods. Rapid and reliable identification of food-associated bacteria is also of crucial importance for food processing and product quality. This review is concerned with the applicability of MALDI-TOF MS for routine identification of foodborne bacteria taking the specific requirements of food microbiological laboratories and the food industry into account. The current state of knowledge including recent findings and new approaches are discussed.

scholarly journals Rapid Identification of Vibrio parahaemolyticus by Whole-Cell Matrix-Assisted Laser Desorption Ionization-Time of Flight Mass Spectrometry

2009 ◽  
Vol 75 (21) ◽  
pp. 6745-6756 ◽  
Author(s):  
Tracy H. Hazen ◽  
Robert J. Martinez ◽  
Yanfeng Chen ◽  
Patricia C. Lafon ◽  
Nancy M. Garrett ◽  
...  
Keyword(s):  
Vibrio Parahaemolyticus ◽  
Laser Desorption ◽  
Rapid Identification ◽  
Laser Desorption Ionization ◽  
Ionization Time ◽  
Whole Cell ◽  
Maldi Tof Ms ◽  
Maldi Tof ◽  
Flight Mass Spectrometry ◽  
Tof Ms

ABSTRACT Vibrio parahaemolyticus is a pathogenic marine bacterium that is the main causative agent of bacterial seafood-borne gastroenteritis in the United States. An increase in the frequency of V. parahaemolyticus-related infections during the last decade has been attributed to the emergence of an O3:K6 pandemic clone in 1995. The diversity of the O3:K6 pandemic clone and its serovariants has been examined using multiple molecular techniques including multilocus sequence analysis, pulsed-field gel electrophoresis, and group-specific PCR analysis. Matrix-assisted laser desorption ionization-time of flight mass spectrometry (MALDI-TOF MS) has become a powerful tool for rapidly distinguishing between related bacterial species. In the current study, we demonstrate the development of a whole-cell MALDI-TOF MS method for the distinction of V. parahaemolyticus from other Vibrio spp. We identified 30 peaks that were present only in the spectra of the V. parahaemolyticus strains examined in this study that may be developed as MALDI-TOF MS biomarkers for identification of V. parahaemolyticus. We detected variation in the MALDI-TOF spectra of V. parahaemolyticus strains isolated from different geographical locations and at different times. The MALDI-TOF MS spectra of the V. parahaemolyticus strains examined were distinct from those of the other Vibrio species examined including the closely related V. alginolyticus, V. harveyi, and V. campbellii. The results of this study demonstrate the first use of whole-cell MALDI-TOF MS analysis for the rapid identification of V. parahaemolyticus.

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