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Journal of Clinical Microbiology, July 1999, p. 2280-2284, Vol. 37, No. 7
Departments of Laboratory
Medicine1 and Internal
Medicine,
Received 8 February 1999/Returned for modification 9 March
1999/Accepted 15 April 1999
From September 1990 to October 1990, 15 patients who were admitted
to four different departments of the National Taiwan University Hospital, including nine patients in the emergency department, three in
the hematology/oncology ward, two in the surgical intensive care unit,
and one in a pediatric ward, were found to have positive blood (14 patients) or pleural effusion (1 patient) cultures for Bacillus
cereus. After extensive surveillance cultures, 19 additional isolates of B. cereus were recovered from 70% ethyl
alcohol that had been used as a skin disinfectant (14 isolates from
different locations in the hospital) and from 95% ethyl alcohol (5 isolates from five alcohol tanks in the pharmacy department), and 10 isolates were recovered from 95% ethyl alcohol from the factory which
supplied the alcohol to the hospital. In addition to these 44 isolates of B. cereus, 12 epidemiologically unrelated B. cereus isolates, one Bacillus sphaericus isolate from
a blood specimen from a patient seen in May 1990, and two B. sphaericus isolates from 95% alcohol in the liquor factory were
also studied for their microbiological relatedness. Among these
isolates, antibiotypes were determined by using the disk diffusion
method and the E test, biotypes were created with the results of the
Vitek Bacillus Biochemical Card test, and random amplified
polymorphic DNA (RAPD) patterns were generated by arbitrarily primed
PCR. Two clones of the 15 B. cereus isolates recovered from
patients were identified (clone A from 2 patients and clone B from 13 patients), and all 29 isolates of B. cereus recovered from
70 or 95% ethyl alcohol in the hospital or in the factory belonged to
clone B. The antibiotype and RAPD pattern of the B. sphaericus isolate from the patient were different from those of
isolates from the factory. Our data show that the pseudoepidemic was
caused by a clone (clone B) of B. cereus from contaminated
70% ethyl alcohol used in the hospital, which we successfully traced
to preexisting contaminated 95% ethyl alcohol from the supplier, and
by another clone (clone A) without an identifiable source.
0095-1137/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Nosocomial Pseudoepidemic Caused by Bacillus
cereus Traced to Contaminated Ethyl Alcohol from a Liquor
Factory
*
Corresponding author. Mailing address: Department of
Laboratory Medicine, National Taiwan University Hospital, No. 7 Chung-Shan South Rd., Taipei, Taiwan. Phone: 886-2-23562149. Fax:
886-2-23224263. E-mail: luhkt{at}ha.mc.ntu.edu.tw.
Journal of Clinical Microbiology, July 1999, p. 2280-2284, Vol. 37, No. 7
0095-1137/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
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