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The Journal of Medical Microbiology, Vol 15, Issue 1 97-103, Copyright © 1982 by Society for General Microbiology

JOURNAL ARTICLE

Characterisation of an unusual bacterium isolated from genital ulcers

J. P. Ursi, E. van Dyck, R. C. Ballard, W. Jacob, P. Piot and A. Z. Meheus

The preliminary characterisation of an unusual gram-negative bacillus isolated from genital ulcers in Swaziland is reported. Like Haemophilus ducreyi, it is an oxidase positive, nitrate-reductase-positive gram-negative rod that forms streptobacillary chains in some circumstances; it was therefore called the "ducreyi-like bacterium" (DLB). Distinguishing features of DLB are production of alpha-haemolysis on horse-blood agar, stimulation of growth by a microaerophilic atmosphere and by a factor produced by Staphylococcus aureus, a strongly positive porphyrin test, and a remarkable ability to undergo autolysis. DLB had a guanine + cytosine value of c. 50 mole% but it cannot be classified, even at the genus level, until more taxonomic data are obtained.




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