The oxidase test in yeasts of medical importance

The results of an oxidase test were positive with species of Cryptococcus and eight species of Candida, but negative with Candida krusei and species of Saccharomyces and Torulopsis, grown on Columbia Agar base and similar media, including Brain Heart Infusion Agar and Mueller Hinton Agar. When grown on Sabouraud Dextrose Agar, all the yeast genera and species were oxidase negative. The test is useful in delineating the genus Candida from Saccharomyces and Torulopsis.