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108 Staphylococcus spp. strains from 300 clinical specimens from hospitalized patients were isolated. Identification and drug resistance were determined using automated ATB system. 37 S. aureus strains, 44 S. epidermides strains and 27 strains of other coagulase-negative staphylococci were cultured. Sensitivity to methicillin of S. aureus was determined with four methods: ATB system, disc-diffusion (Oxan 1 up.), Crystal MRSA ID System and agar screen test in TSA medium with methicillin (25 (ug/ml). 13 S. aureus strains (about 1/3 of strains) were methicillinn-resistant (MRSA). Complete conformity of the results was obtained with Crystal MRSA ID, disc-diffusion and agar screen test. In the case of three .S. aureus strains the results of determination in ATB system were not consistent with the results obtained with the use of the methods mentioned above. Susceptibility to methicillin of 71 coagulase-negative strains (CNS) was determined using two methods at first: ATB and disc-diffusion. In the case of 25 methicillin-resislant strains identical results were obtained. For 20 coagulase-negative strains non-conformity with the results of these two methods was observed. As the decisive method, the agar screen test (TSA-MET) was applied. 18 of these 20 CNS strains were categorized as methicillin-resistant. Finally, 43 MRCNS (i.e. 60%) were detected among 71 coagulase-negative strains. The results of methicillin resistance determination of staphylococci in an automated system should be confirmed with a second test such as agar screen, disc-diffusion or Crystal MRSA ID System (in the case of S. aureus).
Oznaczono wrażliwość 237 szczepów rodzaju Staphylococcus na naturalne i syntetyczne chelatory Fe3+. Poszukiwano związków między wrażliwością na chelator i przynależnością gatunkową szczepu oraz jego pochodzeniem.
Biofilm forming multidrug resistant Staphylococcus spp. are major reservoirs for transmission of ophthalmic infections. They were isolated from ocular patients suffering from conjunctivitis. In this study we analyzed biofilm forming ability, antibiotic resistance profile of the Staphylococcus spp. isolated from clinical ocular patients, and their phylogenetic relationship with other community MRSA. Sixty Staphylococcus spp. strains isolated from clinical subjects were evaluated for their ability to form biofilm and express biofilm encoding ica gene. Among them 93% were slime producers and 87% were slime positive. Staphylococcus aureus and S. epidermidis were dominant strains among the isolates obtained from ocular patients. The strains also exhibited a differential biofilm formation quantitatively. Antibiotic susceptibility of the strains tested with Penicillin G, Ciprofloxacin, Ofloxacin, Methicillin, Amikacin, and Gentamicin indicated that they were resistant to more than one antibiotic. The amplicon of ica gene of strong biofilm producing S. aureus strains, obtained by polymerase chain reaction, was sequenced and their close genetic relationship with community acquired MRSA was analyzed based on phylogenetic tree. Our results indicate that they are genetically close to other community acquired MRSA.
Porównano 4 komercyjne systemy służące do identyfikacji gronkowców zarówno koagulazo-ujemnych, jak i koagulazo-dodatnich. Stwierdzono, że najbardziej przydatnym z ocenianych systemów był zestaw ID 32 STAPH.
365 S. aureus and 165 CNS were evaluated for susceptibility to methicillin. They were recived from various clinic of Clinical Hospital in Bydgoszcz. The bacterial cells that grew in the presence of 25 mg methicillin/L were evaluated as methicillin-resistant. It was found that the 129 MRSA and MRCNS. Incidence depended on the kind of clinic and material. Most often they were isolated from clinic: Surgery, Neurosurgery, Intensive Care Unit, Neurology and Ortopedics. They were from: intubation tube, catheters and vascular grafts. The methicillin-resistent S. epidemidis and S. haemolyticus showed above 50% resistance to methicillin.
Praca porównuje wrażliwość in vitro bakteryjnych szczepów szpitalnych na działanie piperacyliny z tazobactamem w stosunku do samej piperacyliny. Stwierdzono duże zróżnicowanie wrażliwości na te preparaty pałeczek Gram-ujemnych z rodziny Enterobacteriaceae oraz rodzaju Staphylococcus (MSS). W obrębie pałeczek Gram-ujemnych niefermentujących, enterokoków i beztlenowców nie stwierdzono żadnych różnic we wrażliwości na badane preparaty.
The activity of β-lactam antibiotics (oxacillin, cloxacillin, cephalotin), vancomycin, gentamicin and rifampicin applied in vitro individually and in combination against 37 nosocomial methicillin-resistant strains of coagulase-negative staphylococci (CNS) was assessed to demonstrate the heterogeneity of this group of bacteria and estimate the chance of the efficacy of such therapy. The strains belonged to four species: Staphylococcus epidermidis, Staphylococcus haemolyticus, Staphylococcus cohnii, Staphylococcus hominis. They originated from a hospital environment and from the skin of medical staff of the intensive care unit of a paediatric ward at a university hospital. All strains were methicillin-resistant, according to CLSI standards, but individual strains differed in MICOX values. Susceptibility to other tested antibiotics was also characteristic for the species. The increased susceptibility to antibiotics in combinations, tested by calculating the fractional inhibitory concentration (FIC) index, concerned 26 out of 37 investigated strains and it was a feature of a particular species. Combinations of vancomycin and cephalotin against S. epidermidis and oxacillin with vancomycin were significant, as well as cephalotin and rifampicin in growth inhibition of multiresistant S. haemolyticus strains.
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