scholarly journals Detection of enterotoxins and genotyping of Staphylococcus aureus strains isolated from Isfahan Educational Hospital, Iran

2017 ◽  
Vol 32 (3) ◽  
Author(s):  
Seyed Asghar Havaei ◽  
Nahid Rezaei ◽  
Roholla Havaei ◽  
Amirmorteza Ebrahimzadeh Namvar
Keyword(s):  
Staphylococcus Aureus ◽  
Multiplex Pcr ◽  
Molecular Typing ◽  
University Hospital ◽  
Pulse Field ◽  
Pulse Field Gel Electrophoresis ◽  
Typing Methods ◽  
Method Analysis ◽  
Sequence Types

<em>Background and aims:</em> <em>Staphylococcus aureus</em> is known as one of the most important nosocomial pathogens, which may lead to several infections. The aim of this study was determining the enterotoxins A, C, and TSST-1 and molecular characterization of <em>S.</em> <em>aureus</em> strains with PFGE and MLST typing methods. <br /><em>Materials and methods:</em> In the present study during the sixmonths sampling, fifty <em>S.</em> <em>aureus</em> strains were isolated from patients admitted to Al-Zahra university hospital. Antimicrobial susceptibility testing, Multiplex PCR for detection of enterotoxin A, C and TSST-1, pulse field gel electrophoresis (PFGE) and multilocus sequence typing (MLST) were used for molecular typing. <br /><em>Results</em>: In antibiogram the highest and lowest percentage of resistance was belonged to tetracycline and rifampin respectively. Multiplex PCR indicated that 30% of the strains harbored sea and 34% harbored sec genes. However, only 4% of our collected isolates had tsst gene. In PFGE method analysis on all <em>S. aureus</em> strains, a total of 19 different patterns were identified. Nine various sequence types in 27 selected <em>S. aureus</em> isolates were identified by MLST. <br /><em>Conclusions</em>: Present study indicates a possible higher variability among our <em>S. aureus</em> strains by two different molecular typing methods; nevertheless four main common types (CT1, CT7, CT9, and CT11) with at least one toxin genes were determined.

scholarly journals Serological versus molecular typing of surface-associated immune evading polysaccharide antigens-based phenotypes of Staphylococcus aureus

2014 ◽  
Vol 63 (11) ◽  
pp. 1427-1431 ◽  
Author(s):  
Charlene B. Waryah ◽  
Jully Gogoi-Tiwari ◽  
Kelsi Wells ◽  
Paul Costantino ◽  
Hani Al-Salami ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Molecular Typing ◽  
Capsular Polysaccharide ◽  
Specific Primers ◽  
Serological Typing ◽  
Specific Antisera ◽  
Polysaccharide Antigens ◽  
Typing Methods ◽  
Identification And Characterization

The aim of this study was to compare the performance of serological versus molecular typing methods to detect capsular polysaccharide (CP) and surface-associated polysaccharide antigen 336 phenotypes of Staphylococcus aureus isolates. Molecular typing of CP types 1, 5 and 8 was carried out using PCR, whereas serological typing of CP1, 2, 5, 8 and antigen 336 was carried out by slide agglutination using specific antisera. By genotyping, 14/31 strains were CP8 positive, 12/31 strains were CP5 and the remaining 6/31 isolates were non-typable (NT). One isolate was positive for both CP5 and CP8 by PCR, but was confirmed as CP8 type serologically. Detection of CP2 and type 336 by PCR was not possible because specific primers were either not available or non-specific. Using serotyping, 14/31 strains were CP8 positive, 11/31 CP5 positive and 2/31 positive for antigen 336. The remaining four S. aureus isolates were serologically NT. However, three of four NT and two 336-positive S. aureus isolates were encapsulated as determined by light microscopy after capsular staining. This discovery was surprising and warrants further investigations on the identification and characterization of additional capsular phenotypes prevalent among S. aureus clinical isolates. It was concluded that serological typing was a better method than molecular typing for use in epidemiological investigations based upon the distribution of surface-associated polysaccharide antigens-based phenotypes.

scholarly journals ESBL-producing Klebsiella pneumoniae in a University hospital: Molecular features, diffusion of epidemic clones and evaluation of cross-transmission

PLoS ONE ◽  
2021 ◽  
Vol 16 (3) ◽  
pp. e0247875
Author(s):  
Pierre Edwige L. Fils ◽  
Pascal Cholley ◽  
Houssein Gbaguidi-Haore ◽  
Didier Hocquet ◽  
Marlène Sauget ◽  
...  
Keyword(s):  
Klebsiella Pneumoniae ◽  
Clonal Diversity ◽  
University Hospital ◽  
Pulse Field ◽  
Pulse Field Gel Electrophoresis ◽  
Molecular Features ◽  
Serious Infections ◽  
Cross Transmission ◽  
Epidemiological Link ◽  
Sequence Types

The worldwide spread of Klebsiella pneumoniae producing extended-spectrum β-lactamase (ESBL-Kp) is a significant threat. Specifically, various pandemic clones of ESBL-Kp are involved in hospital outbreaks and caused serious infections. In that context, we assessed the phenotypic and molecular features of a collection of ESBL-Kp isolates in a French university hospital and evaluated the occurrence of potential cross-transmissions. Over a 2-year period (2017–2018), 204 non-duplicate isolates of ESBL-Kp were isolated from clinical (n = 118, 57.8%) or screening (n = 86, 42.2%) sample cultures. These isolates were predominantly resistant to cotrimoxazole (88.8%) and ofloxacin (82.8%) but remained susceptible to imipenem (99.3%) and amikacin (93.8%). CTX-M-15 was the most frequent ESBL identified (83.6%). Multilocus sequence typing and pulse-field gel electrophoresis analysis showed an important genetic variability with 41 sequence types (ST) and 50 pulsotypes identified, and the over representation of the international epidemic clones ST307 and ST405. An epidemiological link attesting probable cross-transmission has been identified for 16 patients clustered in 4 groups during the study period. In conclusion, we showed here the dissemination of pandemic clones of ESBL-Kp in our hospital on a background of clonal diversity.

scholarly journals The Prevalence of Virulence Determinants and Antibiotic Resistance Patterns in Methicillin—Resistant Staphylococcus aureus in a Nursing Home in Poland

Pathogens ◽  
2021 ◽  
Vol 10 (4) ◽  
pp. 427
Author(s):  
Martyna Kasela ◽  
Agnieszka Grzegorczyk ◽  
Bożena Nowakowicz-Dębek ◽  
Anna Malm
Keyword(s):  
Staphylococcus Aureus ◽  
Methicillin Resistant Staphylococcus Aureus ◽  
Variable Number Tandem Repeat ◽  
Multidrug Resistant ◽  
Variable Number ◽  
Pulse Field ◽  
Virulence Determinants ◽  
Gene Encoding ◽  
Methicillin Resistant ◽  
Pulse Field Gel Electrophoresis

Nursing homes (NH) contribute to the regional spread of methicillin-resistant Staphylococcus aureus (MRSA). Moreover, residents are vulnerable to the colonization and subsequent infection of MRSA etiology. We aimed at investigating the molecular and phenotypic characteristics of 21 MRSA collected from the residents and personnel in an NH (Lublin, Poland) during 2018. All MRSA were screened for 20 genes encoding virulence determinants (sea-see, eta, etb, tst, lukS-F-PV, eno, cna, ebpS, fib, bbp, fnbA, fnbB, icaADBC) and for resistance to 18 antimicrobials. To establish the relatedness and clonal complexes of MRSA in NH we applied multiple-locus variable-number tandem-repeat fingerprinting (MLVF), pulse field gel electrophoresis (PFGE), multilocus sequence typing (MLST) and staphylococcal cassette chromosome mec (SCCmec) typing. We identified four sequence types (ST) among two clonal complexes (CC): ST (CC22) known as EMRSA-15 as well as three novel STs—ST6295 (CC8), ST6293 (CC8) and ST6294. All tested MRSA were negative for sec, eta, etb, lukS-F-PV, bbp and ebpS genes. The most prevalent gene encoding toxin was sed (52.4%; n = 11/21), and adhesins were eno and fnbA (100%). Only 9.5% (n = 2/21) of MRSA were classified as multidrug-resistant. The emergence of novel MRSA with a unique virulence and the presence of epidemic clone EMRSA-15 creates challenges for controlling the spread of MRSA in NH.

scholarly journals Molecular Typing of Klebsiella pneumoniae Isolated from Medical Centers in Kermanshah Using Pulse Field Gel Electrophoresis

2019 ◽  
Vol In Press (In Press) ◽  
Author(s):  
Azam Elahi ◽  
Alisha Akya ◽  
Roya Chegene Lorestani ◽  
Keyghobad Ghadiri ◽  
Shokofe Baakhshii
Keyword(s):  
Klebsiella Pneumoniae ◽  
Molecular Typing ◽  
Gel Electrophoresis ◽  
Pulse Field ◽  
Pulse Field Gel Electrophoresis ◽  
Medical Centers

scholarly journals Phenotypic and Molecular Characteristics of the MDR Efflux Pump Gene-Carrying Stenotrophomonas maltophilia Strains Isolated in Warsaw, Poland

Biology ◽  
2022 ◽  
Vol 11 (1) ◽  
pp. 105
Author(s):  
Olga M. Zając ◽  
Stefan Tyski ◽  
Agnieszka E. Laudy
Keyword(s):  
Molecular Typing ◽  
Stenotrophomonas Maltophilia ◽  
Efflux Pump ◽  
Pulsed Field Gel Electrophoresis ◽  
Molecular Characteristics ◽  
The World ◽  
Genes Encoding ◽  
Resistance Nodulation Division ◽  
Sequence Types

An increase of nosocomial infections caused by Stenotrophomonas maltophilia strains has recently been observed all over the world. The isolation of these bacteria from the blood is of particular concern. In this study we performed the phenotypic and genotypic characterization of 94 S. maltophilia isolates, including isolates from patients hospitalized in a tertiary Warsaw hospital (n = 79) and from outpatients (n = 15). All isolates were found to be susceptible to trimethoprim-sulfamethoxazole and minocycline, while 44/94 isolates demonstrated a reduction in susceptibility to levofloxacin. A large genetic variation was observed among the isolates tested by pulsed-field gel electrophoresis. A clonal relationship with 100% similarity was observed between isolates within two sub-pulsotypes: the first included nine bloodstream isolates and the second involved six. Multilocus sequence typing showed two new sequence types (ST498 and ST499) deposited in public databases for molecular typing. Moreover, the presence of genes encoding ten different efflux pumps from the resistance-nodulation-division family and the ATP-binding cassette family was shown in the majority of the 94 isolates. The obtained knowledge about the prevalence of efflux pump genes in clinical S. maltophilia strains makes it possible to predict the scale of the risk of resistance emergence in strains as a result of gene overexpression.

scholarly journals European external quality assessments for identification, molecular typing and characterization of Staphylococcus aureus

2018 ◽  
Vol 73 (10) ◽  
pp. 2662-2666 ◽  
Author(s):  
Ariane Deplano ◽  
Magali Dodémont ◽  
Olivier Denis ◽  
Henrik Westh ◽  
Heidi Gumpert ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Molecular Typing ◽  
External Quality ◽  
Quality Assessments

scholarly journals Association of plasmid typing to biotyping and antibiotyping in the characterization of outbreaks by Acinetobacter baumannii

1999 ◽  
Vol 42 (1) ◽  
Author(s):  
Maria Cristina Bronharo Tognim ◽  
Luiz Carlos Jabur Gaziri ◽  
Marilda Carlos Vidotto ◽  
Marcia Regina Perugini
Keyword(s):  
Antibiotic Resistance ◽  
Acinetobacter Baumannii ◽  
University Hospital ◽  
Plasmid Profiles ◽  
Typing Methods

During an outbreak at an University Hospital, from April to September, in 1994, sixteen strains of Acinetobacter baumannii were isolated from patients and one strain from an enteral solution. We afterwards analyzed the outbreak by means of plasmid typing, antibiotic resistance typing and biotyping. Two main plasmid profiles were identified. Twelve strains belonged to biotype 2, and five to biotype 19. Susceptibility to amikacin and to carbenicillin allowed classification of the strains into two groups. The results show that association of those three typing methods allowed the differentiation of what was at first considered as a single outbreak into two apparently unrelated outbreaks.

scholarly journals Genotypic Characterization of Coagulase-negative Staphylococci Isolated from Sheep Milk in Slovakia

2010 ◽  
Vol 79 (2) ◽  
pp. 269-275 ◽  
Author(s):  
Ivana Pilipčincová ◽  
Mangesh Bhide ◽  
Eva Dudriková ◽  
Milan Trávniček
Keyword(s):  
Molecular Characterization ◽  
Gel Electrophoresis ◽  
Biochemical Characterization ◽  
Pulse Field ◽  
Coagulase Negative Staphylococci ◽  
Pulse Field Gel Electrophoresis ◽  
Milk Samples ◽  
Sheep Milk ◽  
Epidemiological Situation

Hitherto very few reports are available presenting identification and molecular characterization of the coagulase negative staphylococci (CNS) from sheep milk in the subclinical stage of mastitis. Furthermore, very scanty data are available on the epidemiological status of CNS in different Slovak provinces. Milk samples from 54 sheep farms located in eastern Slovak region were screened. A total 240 CNS were identified with series of biochemical testes (STAPH-API) and subjected further for genotyping with the help of pulse field gel electrophoresis (PFGE). The most frequently occurring CNS species according the biochemical characterization were:S. epidermidis(36.3 %),S. caprae(21.3 %),S. hominis(6.6 %),S. chromogenes(6.3 %),S. xylosus(5.8 %),S. warneri(5.0 %) andS. capitis(4.6 %). Further PFGE-based characterization of these isolates revealed six pulsotypes of theS. epidermidis, two ofS. caprae, three ofS. chromogenes, nine ofS. hominis, five ofS. capitisand seven ofS. xylosus. These results contribute to knowledge of the epidemiological situation of the CNS from the subclinical form of mastitis in Slovakia.

Sign in / Sign up

Export Citation Format

Share Document