Abstract
The aim of this study was to determine the prevalence of methicillin-resistant Staphylococcus aureus (MRSA), multi-resistant gram-negative bacteria (MRGN) and vancomycin-resistant enterococci (VRE) in three study groups (hospital patients, residents in nursing homes for the elderly and patients in GP practices) and additionally, risk factors for carriage of multidrug-resistant organisms (MDRO). Screening for MDRO was performed as a point prevalence study by obtaining nasal, pharyngeal and rectal swabs or stool samples from voluntary participants in 25 hospitals, 14 nursing homes for the elderly as well as 33 medical practices in 12 of 13 districts of Saxony. Suspicious isolates were further examined phenotypically and partially by molecular methods. The participants completed a questionnaire on possible risk factors for MDRO colonisation; the data were statistically evaluated by correlation analyses. In total, 1,718 persons, 629 from hospitals, 498 from nursing homes and 591 from medical practices, were examined. MDRO was detected in 8.4% of all participants; 1.3% persons tested positive for MRSA, 5.2% for 3MRGN, 0.1% for 4MRGN and 2.3% for VRE. Nine persons were colonized with more than one MDRO. The following independent risk factors could be significantly associated with the detection of MDRO: presence of a degree of care (MDRO), male sex (MDRO/VRE), current antibiosis (MDRO/VRE), antibiosis within the last 6 months (MDRO/MRSA/MRGN/VRE), current tumour disease (MDRO/3MRGN), peripheral artery disease (PAD) (MRSA) as well as urinary incontinence (3MRGN). To our knowledge, this study represents the first survey of prevalence of different multiresistant pathogen groups in 3 study groups including outpatients in Germany. 3MRGN were the pathogens most frequently detected and were also found in patients of younger age groups. VRE were found almost exclusively in specific clinics. In addition to current and past antibiotic therapy, in particular the presence of PAD for MRSA detection, urinary incontinence for 3MRGN detection and a current tumour disease for MDRO and 3MRGN detection were determined as independent risk factors.
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