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Journal of Clinical Microbiology, Mar 1997, 614-619, Vol 35, No. 3
DA Henry, ME Campbell, JJ LiPuma and DP Speert
We evaluated 819 isolates referred to us as "Burkholderia cepacia" from
cystic fibrosis (CF) clinics and research laboratories from five countries;
28 (3.4%) were not B. cepacia. A further 12 (1.5%) organisms appeared to be
other Burkholderia species, but identification could not be confirmed by
conventional means. The most prevalently misidentified organisms were
Stenotrophomonas maltophilia, Alcaligenes xylosoxidans, and Comamonas
acidovorans. Many of these organisms grew on oxidation- fermentation
polymyxin-bacitracin-lactose (OFPBL) and Pseudomonas cepacia agars,
selective media currently used for B. cepacia isolation. We developed a new
medium, B. cepacia selective agar (BCSA), which is more enriched for the
growth of B. cepacia yet which is more selective against other organisms
than currently available selective agars. A total of 190 of 191 (99.5%)
isolates of B. cepacia from patients with CF grew on BCSA without
vancomycin, whereas 100% grew on OFPBL agar and 179 (94.2%) grew on P.
cepacia agar. Of 189 other gram-negative and gram-positive organisms
tested, 10 (5.3%) grew on BCSA without vancomycin. The addition of
vancomycin to BCSA lowered the false positivity rate to 3.7% without
further inhibition of B. cepacia. The false positivity rates for OFPBL and
P. cepacia agars were 19.6 and 13.8%, respectively. Isolates of B. cepacia
from CF patients grew most quickly on BCSA, with 201 of 205 (98.0%) being
readily visible within 24 h, whereas 182 (88.8%) grew on OFPBL agar and 162
(79.0%) grew on P. cepacia agar within 24 h. We propose that the use of
BCSA will allow investigators to overcome many of the difficulties
associated with the identification of B. cepacia and should be considered
for use as a primary isolation agar for specimens from patients with CF.
Copyright © 1997 by the American Society for Microbiology. All rights reserved.
Identification of Burkholderia cepacia isolates from patients with cystic fibrosis and use of a simple new selective medium
Department of Paediatrics, University of British Columbia, Vancouver, Canada.
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