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Journal of Clinical Microbiology, June 2001, p. 2098-2101, Vol. 39, No. 6
Clinical Microbiology Laboratory, Duke
University Medical Center,1 and
Departments of Pathology2 and
Medicine,3 Duke University School of
Medicine, Durham, North Carolina 27710
Received 7 February 2001/Returned for modification 13 March
2001/Accepted 2 April 2001
To evaluate the performance of BacT/ALERT FA (FA) medium,
a new aerobic BacT/ALERT FAN (FAN) medium (Organon Teknika
Corporation, Durham, N.C.) that does not require the added cost and
inconvenience of a venting unit, we inoculated blood specimens
from adult patients with suspected sepsis into an original FAN aerobic
culture bottle and an FA bottle. Of 7,745 blood culture sets containing
both bottles, 5,256 (68%) met the criteria for adequacy of filling. A
total of 466 isolates judged to represent the causes of true infections
were recovered from 276 patients; 271 isolates were recovered from both
bottles, 82 were recovered from the FAN bottle only, and 113 were
recovered from the FA bottle only (P < 0.05). More
Burkholderia cepacia isolates (P < 0.01),
Candida albicans isolates (P < 0.001),
Cryptococcus neoformans isolates (P < 0.01), yeasts overall (P < 0.001), and total
microorganisms (P < 0.05) were recovered from FA
bottles. Of cultures found to be positive within the first 72 h of
incubation, the mean times to detection were almost identical for FAN
(20.4 h) and FA (20.7 h) bottles. Of 263 isolates that caused
monomicrobic episodes of bloodstream infections, 180 were detected in
both bottles, 32 were detected in FAN bottles only, and 51 were
detected in FA bottles only (P < 0.05). Of 186 isolates considered to be contaminants, 63 were detected in both media,
64 were detected in FAN bottles only, and 59 were detected in FA
bottles only (P was not significant). The number of
false-positive results were comparable: 69 (1.3%) in FAN bottles and
56 (1.1%) in FA bottles. However, there were 14 isolates with
false-negative results (6 yeasts, 6 nonfermenters, and 1 isolate each
of Propionibacterium acnes and coagulase-negative staphylococci) in FAN bottles, whereas there were none in FA bottles. On the basis of these results, we conclude that the new nonvented FA
bottle is superior to the original vented FAN medium for the recovery
of B. cepacia and yeasts, especially C. albicans and C. neoformans, and is comparable to FAN
medium for other microorganisms.
0095-1137/01/$04.00+0 DOI: 10.1128/JCM.39.6.2098-2101.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
Controlled Comparison of Original Vented Aerobic FAN Medium with
New Nonvented BacT/ALERT FA Medium for Culturing Blood
*
Corresponding author. Mailing address: Clinical
Microbiology Laboratory, Duke University Medical Center, Box 2902, Durham, NC 27710. Phone: (919) 684-2562. Fax: (919) 684-8519. E-mail: stanley.mirrett{at}duke.edu.
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