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Journal of Clinical Microbiology, May 2000, p. 1763-1766, Vol. 38, No. 5
Laboratory of Hospital Infection, Central
Public Health Laboratory, London NW9 5HT, United Kingdom
Received 10 November 1999/Returned for modification 9 January
2000/Accepted 15 February 2000
In the last 15 years, Burkholderia cepacia has emerged
as a significant pathogen in cystic fibrosis (CF) patients, mainly due
to the severity of infection observed in a subset of patients and the
fear of transmission of the organism to noncolonized patients. Although
patients who deteriorate rapidly cannot be predicted by microbiological
characteristics, three genetic markers have been described for strains
that spread between patients. These are the cblA gene,
encoding giant cable pili; a hybrid of two insertion sequences,
IS1356 and IS402; and a 1.4-kb open reading frame known as the B. cepacia epidemic strain marker
(BCESM). The latter two are of unknown function. An epidemic strain
lineage was previously identified among CF patients in the United
Kingdom that apparently had spread from North America and that was
characterized by a specific random amplified polymorphic DNA (RAPD)
pattern. We searched for the described genetic markers using specific
PCR assays with 117 patient isolates of B. cepacia from 40 United Kingdom hospitals. Isolates were grouped according to genomovar and epidemic strain lineage RAPD pattern with a 10-base primer, P272. A
total of 41 isolates from patients in 12 hospitals were classified as
the epidemic strain, and 40 of these were distributed in genomovars
IIIa (11 isolates), IIIb (1 isolate), and IIIc (28 isolates). All
isolates of the epidemic strain were positive for the cblA
gene and BCESM, but two lacked the insertion sequence hybrid. None of
the 76 sporadic isolates contained cblA or the insertion
sequence hybrid, but 11 of them were positive for BCESM. Nonepidemic
isolates were distributed among genomovars I or IV (9), II (49), IIIa
(11), IIIb (3), and IIIc (4). There were three clusters of
cross-infection (one involving two patients and two involving three
patients) with isolates of genomovar II. We conclude that in the United
Kingdom, a single clonal lineage has spread between and within some
hospitals providing care for CF patients. The presence of the
cblA gene is the most specific marker for the epidemic
strain. We recommend that all isolates of B. cepacia from
CF patients should be screened by PCR to influence segregation and
infection control strategies.
0095-1137/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Distribution of Genes Encoding Putative Transmissibility
Factors among Epidemic and Nonepidemic Strains of
Burkholderia cepacia from Cystic Fibrosis Patients in
the United Kingdom
*
Corresponding author. Mailing address: Laboratory of
Hospital Infection, Central Public Health Laboratory, 61 Colindale
Ave., London NW9 5HT, United Kingdom. Phone: 44 (0)208 200 4400. Fax: 44 (0)208 200 7449. E-mail: tpitt{at}phls.nhs.uk.
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