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Genetic diversity among community methicillin-resistant Staphylococcus aureus strains causing outpatient infections in Australia
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Coombs GW Nimmo GR Bell JM Huygens F O'Brien FG Malkowski MJ Pearson JC Stephens AJ Giffard PM;Australian Group for Antimicrobial Resistance 《Journal of clinical microbiology》2004,42(10):4735-4743
Increasing reports of the appearance of novel nonmultiresistant methicillin-resistant Staphylococcus aureus MRSA (MRSA) strains in the community and of the spread of hospital MRSA strains into the community are cause for public health concern. We conducted two national surveys of unique isolates of S. aureus from clinical specimens collected from nonhospitalized patients commencing in 2000 and 2002, respectively. A total of 11.7% of 2,498 isolates from 2000 and 15.4% of 2,486 isolates from 2002 were MRSA. Approximately 54% of the MRSA isolates were nonmultiresistant (resistant to less than three of nine antibiotics) in both surveys. The majority of multiresistant MRSA isolates in both surveys belonged to two strains (strains AUS-2 and AUS-3), as determined by pulsed-field gel electrophoresis (PFGE) and resistogram typing. The 3 AUS-2 isolates and 10 of the 11 AUS-3 isolates selected for multilocus sequence typing (MLST) and staphylococcal chromosomal cassette mec (SCCmec) analysis were ST239-MRSA-III (where ST is the sequence type) and thus belonged to the same clone as the eastern Australian MRSA strain of the 1980s, which spread internationally. Four predominant clones of novel nonmultiresistant MRSA were identified by PFGE, MLST, and SCCmec analysis: ST22-MRSA-IV (strain EMRSA-15), ST1-MRSA-IV (strain WA-1), ST30-MRSA-IV (strain SWP), and ST93-MRSA-IV (strain Queensland). The last three clones are associated with community acquisition. A total of 14 STs were identified in the surveys, including six unique clones of novel nonmultiresistant MRSA, namely, STs 73, 93, 129, 75, and 80slv and a new ST. SCCmec types IV and V were present in diverse genetic backgrounds. These findings provide support for the acquisition of SCCmec by multiple lineages of S. aureus. They also confirm that both hospital and community strains of MRSA are now common in nonhospitalized patients throughout Australia. 相似文献
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Georgina L Ryland Sally M Hunter Maria A Doyle Simone M Rowley Michael Christie Prue E Allan David DL Bowtell Australian Ovarian Cancer Study Group Ian G Campbell 《The Journal of pathology》2013,229(3):469-476
Mucinous carcinomas represent a distinct morphological subtype which can arise from several organ sites, including the ovary, and their genetic characteristics are largely under‐described. Exome sequencing of 12 primary mucinous ovarian tumours identified RNF43 as the most frequently somatically mutated novel gene, secondary to KRAS and mutated at a frequency equal to that of TP53 and BRAF. Further screening of RNF43 in a larger cohort of ovarian tumours identified additional mutations, with a total frequency of 2/22 (9%) in mucinous ovarian borderline tumours and 6/29 (21%) in mucinous ovarian carcinomas. Seven mutations were predicted to truncate the protein and one missense mutation was predicted to be deleterious by in silico analysis. Six tumours had allelic imbalance at the RNF43 locus, with loss of the wild‐type allele. The mutation spectrum strongly suggests that RNF43 is an important tumour suppressor gene in mucinous ovarian tumours, similar to its reported role in mucinous pancreatic precancerous cysts. Copyright © 2012 Pathological Society of Great Britain and Ireland. Published by John Wiley & Sons, Ltd. 相似文献
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Deborah L. Davis Kim Walker Australian Catholic University St Vincent's Private Hospital Sydney) 《Midwifery》2010
The body is of central concern to midwifery yet, as a profession, we have largely failed to grapple with the corpus of feminist and other literature that deals with the body. This article provides an overview of the ways in which the body has been theorised, from the essential and biological through to postmodern theories of the body. We draw attention to the limitations of some of these approaches, suggesting that Elizabeth Grosz's schema of the Möbius strip (representing the inter-relationships between the inside and outside, culture and nature) provides a useful framework for thinking about the body; one that avoids a biological materialism that disregards the effect of culture, and a cultural determinism that neglects the corporeal body. Recognising the multiplicity and fluidity of women's experiences of pregnancy, their body and childbearing emancipates us from the limitations imposed by the masculinist Western philosophical traditions that we have inherited. 相似文献
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