High Incidence of Multidrug-Resistant Gram-Negative Bacteria Recovered from Afghan Patients at a Deployed US Military Hospital

Objective. To investigate potential sources and risks associated with multidrug-resistant (MDR) bacteria in a deployed US military hospital. Design. Retrospective analysis of factors associated with recovery of MDR bacteria, supplemented by environmental sampling. Setting. The largest US military ho...

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Bibliographic Details
Published in:	Infection control and hospital epidemiology Vol. 32; no. 9; pp. 854 - 860
Main Authors:	Sutter, Deena E., Bradshaw, Linda U., Simkins, Lucas H., Summers, Amy M., Atha, Michael, Elwood, Robert L., Robertson, Janelle L., Murray, Clinton K., Wortmann, Glenn W., Hospenthal, Duane R.
Format:	Journal Article
Language:	English
Published:	Chicago, IL University of Chicago Press 01-09-2011
Subjects:	Acinetobacter Afghan Campaign 2001 Afghanistan - epidemiology Age Antimicrobials Bacteria beta-Lactam Resistance beta-Lactamases Biological and medical sciences Central Asian culture Child health services Colonization Community-Acquired Infections - epidemiology Cross Infection - epidemiology Data processing Demography Drug resistance Drug Resistance, Multiple, Bacterial Enterobacteriaceae Environmental monitoring Equipment Contamination - statistics & numerical data Escherichia coli Gender Gram negative bacteria Gram-Negative Bacteria - enzymology Gram-Negative Bacterial Infections - epidemiology Hospital admissions Hospital beds Hospitals Hospitals, Military - statistics & numerical data Humans Incidence Infections Injuries Klebsiella Length of Stay Medical sciences Military Miscellaneous Nursing Original Article Public health. Hygiene Public health. Hygiene-occupational medicine Retrospective Studies Risk Factors Sampling Trauma United States Wounds and Injuries - complications United States North America America Afghanistan USA Human Infection Multiple resistance Hospital Epidemiology Public health Gram negative bacteria Incidence Military
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Summary:	Objective. To investigate potential sources and risks associated with multidrug-resistant (MDR) bacteria in a deployed US military hospital. Design. Retrospective analysis of factors associated with recovery of MDR bacteria, supplemented by environmental sampling. Setting. The largest US military hospital in Afghanistan. Patients. US and Afghan patients with positive bacterial culture results, from September 2007 through August 2008. Methods. Microbiologic, demographic, and clinical data were analyzed. Potential risk factors included admission diagnosis or mechanism of injury, length of stay, gender, age, and nationality (US or Afghan). Environmental sampling of selected hospital high-touch surfaces and equipment was performed to help elucidate whether environmental MDR bacteria were contributing to nosocomial spread. Results. A total of 266 patients had 411 bacterial isolates that were identified during the study period, including 211 MDR bacteria (51%). Gram-negative bacteria were common among Afghan patients (241 [76%] of 319), and 70% of these were classified as MDR. This included 58% of bacteria recovered from Afghan patients within 48 hours of hospital admission. The most common gram-negative bacteria were Escherichia coli (53% were MDR), Acinetobacter (90% were MDR), and Klebsiella (63% were MDR). Almost one-half of potential extended-spectrum β-lactamase (ESBL) producers were community acquired. Of 100 environmental swab samples, 18 yielded MDR bacteria, including 10 that were Acinetobacter, but no potential ESBL-producing bacteria. Conclusions. Gram-negative bacteria from Afghan patients had high rates of antimicrobial resistance. Patients experiencing complex trauma and prolonged hospital stays likely contribute to the presence of MDR bacteria in this facility. However, many of these patients had community-acquired cases, which implies high rates of colonization prior to hospital admission.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 ObjectType-Article-2 ObjectType-Feature-1
ISSN:	0899-823X 1559-6834
DOI:	10.1086/661284