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Journal of Clinical Microbiology logoLink to Journal of Clinical Microbiology
. 1989 Jul;27(7):1441–1445. doi: 10.1128/jcm.27.7.1441-1445.1989

DNA probes for the identification of Haemophilus ducreyi.

L M Parsons 1, M Shayegani 1, A L Waring 1, L H Bopp 1
PMCID: PMC267589  PMID: 2788660

Abstract

Haemophilus ducreyi ATCC 33922, a virulent, well-characterized strain, was used to construct a genomic library in a bacteriophage expression vector. Three DNA fragments were selected for use as probes on the basis of their ability to encode H. ducreyi-specific proteins, as demonstrated by reactivity with rabbit polyclonal antiserum. With DNA-DNA hybridization, the three probes, labeled with 32P, reacted strongly with 16 strains of H. ducreyi obtained from a variety of sources. Thirty-seven other bacterial isolates, representing 33 different species and including organisms likely to be encountered in the urogenital tract, were also tested with the three probes. Twenty-eight of these isolates, including the genital pathogen Neisseria gonorrhoeae, showed no hybridization with the probes. In addition, herpes simplex virus-infected tissue culture cells and Treponema pallidum-infected rabbit testicular fluid were also completely nonreactive. Nine isolates, six belonging to other Haemophilus species and three belonging to Pasteurella species, reacted weakly with the probes when approximately 3.0 x 10(7) to 6.0 x 10(7) CFU was tested. When 10(5) to 10(6) CFU of these organisms was tested, the weak reactions could no longer be seen. Yet this number of H. ducreyi still reacted strongly. In fact, the three probes consistently detected 10(4) CFU of H. ducreyi in pure and mixed cultures and even produced a weak signal when only 10(3) CFU was present. It is clear from our results that use of these probes will greatly facilitate the laboratory diagnosis of this genital pathogen.

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Selected References

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