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Journal of Clinical Microbiology, Nov 1996, 2760-2765, Vol 34, No. 11
MC Fuste, MA Pineda, J Palomar, M Vinas and JG Loren
The genetic structure of a population of multidrug-resistant nontypeable
(unencapsulated) Haemophilus influenzae strains isolated at a hospital in
Barcelona, Spain, was investigated by using multilocus enzyme
electrophoresis to determine the allelic variation in 15 structural loci.
In our study we have also included some antimicrobial agent-susceptible
strains isolated at the same hospital. All enzymes were polymorphic for two
to eight electromorphs, and the analysis revealed 43 distinct
electrophoretic types among the 44 isolates. The mean genetic diversity of
the entire population was 0.55. Multilocus linkage disequilibrium analysis
of the isolates revealed a strong association between alleles, suggesting
little possibility of recombination. Furthermore, the dendrogram and the
allele mismatch distribution are typical of a population with no extensive
genetic mixing.
Copyright © 1996 by the American Society for Microbiology. All rights reserved.
Clonality of multidrug-resistant nontypeable strains of Haemophilus influenzae
Departament de Microbiologia i Parasitologia Sanitaries, Facultat de Farmacia, Universitat de Barcelona, Spain.
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