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Surveillance cultures for detection of rectal and lower respiratory tract carriage of colistin-resistant Gram-negative bacilli in intensive care unit patients : comparison of direct plating and pre-enrichment stepGerm, Julija ...Purpose. Increasing consumption of colistin as treatment for infections with multidrug-resistant (MDR) Gram-negative bacilli (GNB) has been accompanied by increasingly frequent reports of ... colistin-resistant (ColR) MDR GNB. Higher selective pressure creates a favourable environment that can facilitate the spread of ColR isolates. Monitoring of asymptomatic ColR GNB carriage can give us a better understanding of this emerging healthcare problem, particularly in wards with higher polymyxin selective pressure and prevalence of carbapenem-resistant GNB. Our aim was to assess the ColR GNB colonization rate in intensive care unit (ICU) patients and evaluate the performance of two surveillance protocols using a selective medium. Methodology. A prospective study included 739 surveillance samples (rectal swabs and tracheal aspirates) from 330 patients that were screened for ColR GNB carriage using SuperPolymyxin medium. Two approaches were used: direct sample plating and overnight pre-enrichment of samples followed by plating. Colistin resistance was confirmed with broth microdilution. ColR isolates were molecularly screened for plasmid-mediated mcr genes. Results. A total of 44/739 samples (45 ColR GNB isolates) were positive for ColR GNB, which included 31/330 (9.4%) colonized patients; mcr genes were not detected. The direct plating method only identified 17/45 (37.8%) isolates correctly, whereas the pre-enrichment protocol identified all 45 ColR GNB. Conclusion. The colonization rate among our ICU patients was 9.4 %. Based on our findings, the pre-enrichment step is necessary for the determination of ColR GNB carriage - even though the time to result takes an additional day, fewer than half of ColR GNB carriers were detected using the direct plating protocol.Source: Journal of medical microbiology. - ISSN 0022-2615 (Vol. 68, iss. 9, Sep. 2019, str. 1269-1278)Type of material - article, component partPublish date - 2019Language - englishCOBISS.SI-ID - 34388953
source: Journal of medical microbiology. - ISSN 0022-2615 (Vol. 68, iss. 9, Sep. 2019, str. 1269-1278)
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Germ, Julija | 34859 |
Cerar Kišek, Tjaša, 1980- | 24350 |
Kokošar Ulčar, Barbara | 38539 |
Lejko-Zupanc, Tatjana | 11330 |
Mrvič, Tatjana | 24051 |
Kerin-Povšič, Milena | 21759 |
Seme, Katja, 1966- | 14504 |
Pirš, Mateja, 1974- | 31399 |
Source: Personal bibliographies
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