Colonization of residents and staff of a long-term-care facility and adjacent acute-care hospital geriatric unit by multiresistant bacteria

被引:127
|
作者
March, A. [2 ]
Aschbacher, R. [3 ]
Dhanji, H. [1 ]
Livermore, D. M. [1 ]
Boettcher, A. [2 ]
Sleghel, F. [2 ]
Maggi, S. [4 ]
Noale, M. [4 ]
Larcher, C. [3 ]
Woodford, N. [1 ]
机构
[1] Hlth Protect Agcy, Antibiot Resistance Monitoring & Reference Lab, Ctr Infect, London NW9 5EQ, England
[2] Comprensorio Sanit Bolzano, Reparto Geriatria, Bolzano, Italy
[3] Comprensorio Sanit Bolzano, Lab Aziendale Microbiol & Virol, Bolzano, Italy
[4] CNR, Ist Neurosci, Padua, Italy
关键词
AmpC; extended-spectrum beta-lactamases; long-term-care facility; metallo-beta-lactamase; MRSA; risk factor analysis; screening; VRE; SPECTRUM BETA-LACTAMASE; QUINOLONE RESISTANCE; ESCHERICHIA-COLI; NURSING-HOMES; RISK-FACTORS; KLEBSIELLA; STRAIN; ENTEROBACTERIACEAE; IDENTIFICATION; PREVALENCE;
D O I
10.1111/j.1469-0691.2009.03024.x
中图分类号
R51 [传染病];
学科分类号
100401 ;
摘要
P>Long-term-care facilities (LTCFs) are reservoirs of resistant bacteria. We undertook a point-prevalence survey and risk factor analysis for specific resistance types among residents and staff of a Bolzano LTCF and among geriatric unit patients in the associated acute-care hospital. Urine samples and rectal, inguinal, oropharyngeal and nasal swabs were plated on chromogenic agar; isolates were typed by pulsed-field gel electrophoresis; resistance genes and links to insertion sequences were sought by PCR; plasmids were analysed by PCR, restriction fragment length polymorphism and incompatibility grouping. Demographic data were collected. Of the LTCF residents, 74.8% were colonized with >= 1 resistant organism, 64% with extended-spectrum beta-lactamase (ESBL) producers, 38.7% with methicillin-resistant Staphylococcus aureus (MRSA), 6.3% with metallo-beta-lactamase (MBL) producers, and 2.7% with vancomycin-resistant enterococci. Corresponding rates for LTCF staff were 27.5%, 14.5%, 14.5%, 1.5% and 0%, respectively. Colonization frequencies for geriatric unit patients were lower than for those in the LTCF. Both clonal spread and plasmid transfer were implicated in the dissemination of MBL producers that harboured IncN plasmids bearing bla(VIM-1), qnrS, and bla(SHV-12). Most (44/45) ESBL-producing Escherichia coli isolates had bla(CTX-M) genes of group 1; a few had bla(CTX-M) genes of group 9 or bla(SHV-5); those with bla(CTX-M-15) or bla(SHV-5) were clonal. Risk factors for colonization of LTCF residents with resistant bacteria included age >= 86 years, antibiotic treatment in the previous 3 months, indwelling devices, chronic obstructive pulmonary disease, physical disability, and the particular LTCF unit; those for geriatric unit patients were age and dementia. In conclusion, ESBL-producing and MBL-producing Enterobacteriaceae and MRSA were prevalent among the LTCF residents and staff, but less so in the hospital geriatric unit. Education of LTCF employees and better infection control are proposed to minimize the spread of resistant bacteria in the facility.
引用
收藏
页码:934 / 944
页数:11
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