Abstract:
OBJECTIVE:Patients colonized with methicillin-resistant Staphylococcus aureus (MRSA) may contaminate their immediate environment with this organism. However, the extent to which gastrointestinal colonization with MRSA affects environmental contamination is not known. We investigated the frequency of environmental contamination in the rooms of patients with diarrheal stools and heavy gastrointestinal colonization with MRSA. DESIGN:Prospective observational study. SETTING:A 500-bed teaching hospital. METHODS:Stool specimens submitted for Clostridium difficile toxin assays were inoculated onto colistin-naladixic acid agar. MRSA was identified with standard methods. Samples from a standardized list of 10 environmental surfaces were cultured, from the rooms of 8 patients who had diarrhea that yielded heavy growth of MRSA (case patients) and from the rooms of 6 MRSA-positive patients with stool cultures negative for MRSA (control patients). MRSA isolates from 13 patients (8 case patients and 5 control patients) and 64 of the environmental isolates recovered from their rooms were compared by pulsed-field gel electrophoresis (PFGE). One clinical isolate from a control patient was excluded because there was no corresponding environmental MRSA isolate with which to compare it. RESULTS:Overall, MRSA were recovered from 47 (58.8%) of 80 surfaces in the rooms of case patients, compared with 14 (23.3%) of 60 surfaces in the rooms of control patients (58.8% [95% CI, 47.8-68.9] vs 23.3% [95% CI, 14.3-35.5]; P<.0001). The items most commonly contaminated were bedside rails, blood pressure cuffs, television remote controls, and toilet seats. Seventy-eight percent of the environmental isolates in patients' rooms had PFGE types that were indistinguishable or closely related to those recovered from the patients' clinical specimens. CONCLUSIONS:Patients who have diarrheal stools and heavy gastrointestinal colonization with MRSA are associated with significantly greater environmental MRSA contamination than patients without MRSA in their stool, and they are likely to be the source of that contamination.
journal_name
Infect Control Hosp Epidemioljournal_title
Infection control and hospital epidemiologyauthors
Boyce JM,Havill NL,Otter JA,Adams NMdoi
10.1086/520737subject
Has Abstractpub_date
2007-10-01 00:00:00pages
1142-7issue
10eissn
0899-823Xissn
1559-6834pii
S0195941700036067journal_volume
28pub_type
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journal_title:Infection control and hospital epidemiology
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