SUMMARYAn immunological method based on the specificity of delayed-type skin reactions on guinea-pigs has been used for comparing 17 Nocardia strains. By this method, 4 isolates labelled Nocardia farcinica, four labelled N. asteroides and I strain labelled N. blackwellii could be grouped together with the type strain of N. farcinica. Three other strains labelled N. farcinica were clearly distinct from this group of 10 strains. A strain of N. asteroides used previously as reference strain for this species was clearly distinct from the N. farcinica strains, and this applied also to a recently proposed reference strain of N. asteroides. A strain of N. brasiliensis was clearly distinct from all the other strains, while the results obtained with a strain received without species designation were inconclusive. On this basis, the authors consider that all the 10 strains, which form a homogeneous group, should be classified as iV. farcinica. The 3 other strains labelled N. farcinica should be classified into 2 other species. Nocardia asteroides would seem to be a separate species.
Cette ~tude a 6t~ r6alis~e dans 2 provinces fran~aises indemnes de sporotrichose.A partir de 40 6chantillons (sols, fragments v~g~taux, . .) pr~lev6s en Corse, 59 souehes sont isol~es. Toutes ont les caract6res morphologiques de S. schenckii. Sur 30 souches retenues, 14 sont identifi6es ~ C. stenoceras. Ces 14 souches exigent la pyrimidine, se d6veloppent h 37 ° et donnent en milieu agit6 une morphologie levure ~ 35 ° et 25 °. Une des souches est d'embl6e pathog6ne pour la souris.A partir de 422 petits mammif6res pi~g~s en Alsace, on obtient 37 souches morphologiquement identifiables ~ S. schenckil, 31 de ces souches sont identifi~es ~ C. stenoceras. Les autres sont consid~r~es comme S. schenckii.On discute de la pr6sence des 2 ehampignons dam la nature. Beaucoup de souches de C. stenoceras peuvent ~tre, par d6faut, identifl6es ~ S. schenckii. Ces deux champignons peuvent ~tre isol~s de divers mat6riels provenant de zones tropicales oft la sporotrichose est end6mique mais aussi de zones temp6r6es telles que l'Alsace ou la Corse off la sporotrichose est inexistante.
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