I Machová

Státní Zdravotní Ústav, Praha, Praha, Czech Republic

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Publications (7)15.74 Total impact

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    ABSTRACT: We investigated the population structure of Staphylococcus aureus clonal complex CC121 by mutation discovery at 115 genetic housekeeping loci from each of 154 isolates, sampled on five continents between 1953 and 2009. In addition, we pyro-sequenced the genomes from ten representative isolates. The genome-wide SNPs that were ascertained revealed the evolutionary history of CC121, indicating at least six major clades (A to F) within the clonal complex and dating its most recent common ancestor to the pre-antibiotic era. The toxin gene complement of CC121 isolates was correlated with their SNP-based phylogeny. Moreover, we found a highly significant association of clinical phenotypes with phylogenetic affiliations, which is unusual for S. aureus. All isolates evidently sampled from superficial infections (including staphylococcal scalded skin syndrome, bullous impetigo, exfoliative dermatitis, conjunctivitis) clustered in clade F, which included the European epidemic fusidic-acid resistant impetigo clone (EEFIC). In comparison, isolates from deep-seated infections (abscess, furuncle, pyomyositis, necrotizing pneumonia) were disseminated in several clades, but not in clade F. Our results demonstrate that phylogenetic lineages with distinct clinical properties exist within an S. aureus clonal complex, and that SNPs serve as powerful discriminatory markers, able to identify these lineages. All CC121 genomes harboured a 41-kilobase prophage that was dissimilar to S. aureus phages sequenced previously. Community-associated MRSA and MSSA from Cambodia were extremely closely related, suggesting this MRSA arose in the region.
    PLoS ONE 03/2013; 8(3):e58155. · 3.53 Impact Factor
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    ABSTRACT: Thirteen coagulase-negative, oxidase-negative, and novobiocin-susceptible staphylococci were isolated from human clinical specimens. The isolates were differentiated from known staphylococcal species on the basis of 16S rRNA, hsp60, rpoB, dnaJ, tuf, and gap gene sequencing, automated ribotyping, (GTG)(5)-PCR fingerprinting, and MALDI-TOF MS analysis. Phylogenetic analysis based on the 16S rRNA gene sequence indicated phylogenetic relatedness of the analyzed strains to Staphylococcus haemolyticus, Staphylococcus hominis, Staphylococcus devriesei, and Staphylococcus lugdunensis. DNA-DNA hybridization experiments between representative strains CCM 8418(T), CCM 8421(T), and the closest phylogenetic neighbors confirmed that the isolates represent novel Staphylococcus species, for which the name Staphylococcus petrasii sp. nov. is proposed. Genotypic and phenotypic analyses unambiguously split the strains into two closely related subclusters. Based on the results, two novel subspecies S. petrasii subsp. petrasii subsp. nov. and S. petrasii subsp. croceilyticus subsp. nov. are proposed, with type strains CCM 8418(T) (=CCUG 62727(T)) and CCM 8421(T) (=CCUG 62728(T)), respectively.
    Systematic and Applied Microbiology 01/2013; · 3.31 Impact Factor
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    ABSTRACT: Panton-Valentine leukocidin-producing strains of Staphylococcus aureus can cause severe skin and soft tissue infections and necrotizing pneumonia with a high mortality rate. This is a report on the first case of fatal pneumonia with mediastinitis in an infant in the Czech Republic. The causative agent was a methicillin-susceptible S. aureus strain with pronounced production of the PVL toxin and hyperproduction of enterotoxin A.
    Folia Microbiologica 10/2012; · 1.15 Impact Factor
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    ABSTRACT: One hundred and twenty-seven exfoliative toxin-producing (ET-positive) strains of Staphylococcus aureus collected in 23 Czech and one Slovak maternity hospitals from 1998 to 2011 were genotypically characterized by multilocus sequence typing (MLST), pulsed-field gel electrophoresis (PFGE) profiling, spa gene polymorphism analysis, and ETA-converting prophage carriage, which resulted in the identification of 21 genotypes grouped into 4 clonal complexes (CC). Ninety-one isolates carried the eta gene alone whilst 12 isolates harboured only the etb gene. Two new, to date not defined, spa types (t6644 and t6645) and 2 novel sequence types (ST2194 and ST2195) were identified in the set of strains under study. The predominant CC121 occurred in 13 Czech hospitals. CC15, CC9, and ST88 (CC88) exclusively included eta gene-positive strains while the strains belonging to ST121 harboured the eta and/or etb genes. This study highlights not only significant genomic diversity among impetigo strains and the distribution of major genotypes disseminated in the Czech and Slovak maternity hospitals, but also reveals their impact in epidermolytic infections.
    International journal of medical microbiology: IJMM 06/2012; 302(6):237-41. · 4.54 Impact Factor
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    ABSTRACT: To determine toxigenicity and other basic characteristics of 47 strains of Staphylococcus aureus referred to the National Reference Laboratory for Staphylococci (NRL) as suspected causative agents of menstrual toxic shock syndrome (MTSS). S. aureus strains were collected from 11 administrative regions of the Czech Republic in 1997-2011. The diagnosis was based on phenotypic (reverse latex agglutination test) and genotypic (polymerase chain reaction) methods. Forty-four S. aureus strains were producers of toxic shock syndrome toxin 1 (TSST-1), either alone or in combination with staphylococcal enterotoxin. Three strains only produced enterotoxin (B, C, and H). MTSS is a serious multisystem disease. In this study, MTSS often had a severe course requiring intensive care. All MTSS patients used vaginal tampons that had been identified in the literature as a risk factor for MTSS. The case of MTSS in a 36-year-old woman caused by an enterotoxin H positive strain of S. aureus is probably the first to be reported in the world.
    Epidemiologie, mikrobiologie, imunologie: casopis Spolecnosti pro epidemiologii a mikrobiologii Ceske lekarske spolecnosti J.E. Purkyne 11/2011; 60(4):161-6. · 0.36 Impact Factor
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    ABSTRACT: A survey of 280 attendees at a veterinary meeting in the Czech Republic in 2008 revealed a carriage rate of 0.7% for methicillin-resistant Staphylococcus aureus (MRSA). The two strains isolated were of distinct genetic lineages, carried type IV SCCmec determinants and were negative for Panton-Valentine leukocidin genes. The MRSA positivity rates for veterinarians in the Czech Republic is considerably lower than reported elsewhere.
    Epidemiology and Infection 03/2009; 137(9):1233-6. · 2.49 Impact Factor
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    ABSTRACT: To detect the genes encoding an important virulence factor, Panton-Valentine leukocidin, in S. aureus isolates from clinical specimens. S. aureus strains from clinical specimens, mainly from patients with skin diseases, referred by microbiological laboratories of the Czech Republic. The strains were identified by both conventional phenotyping methods and molecular biological procedures, in particular polymerase chain reaction. Altogether 108 (8.1%) of 1336 S. aureus strains had the genes encoding Panton-Valentine leukocidin in DNA. Only 11 of these strains were MRSA. S. aureus strains producing Panton-Valentine leukocidin play an important role in serious infections, particularly of the skin. NRL for Staphylococci, National Institute of Public Health, Centre of Epidemiology and Microbiology, is able to detect the production of this toxin, under optimal conditions, within two days.
    Epidemiologie, mikrobiologie, imunologie: casopis Spolecnosti pro epidemiologii a mikrobiologii Ceske lekarske spolecnosti J.E. Purkyne 05/2007; 56(2):88-93. · 0.36 Impact Factor