%0 Journal Article %A L Slootmans %A D A Vanden Berghe %A P Piot %T Typing Haemophilus ducreyi by indirect immunofluorescence assay. %D 1985 %R 10.1136/sti.61.2.123 %J Genitourinary Medicine %P 123-126 %V 61 %N 2 %X Rabbits were inoculated with untreated whole cells of 16 strains of Haemophilus ducreyi. Homologous titres in an indirect immunofluorescence test ranged from 1/320 to 1/1280. No cross reactions, or very few, were observed between antisera to these strains and 22 other (possible taxonomically related) species, strains, and genera. A large diversity in types of antigen was observed among the strains of H ducreyi. Antiserum from two antigens (35000 and 3138), however, reacted with all 16 H ducreyi antigens tested. At least nine of the strains of H ducreyi examined could be identified as determining the type of antigen. %U https://sti.bmj.com/content/sextrans/61/2/123.full.pdf