The isolation, enumeration, and identification of yeasts and molds were carried out in 20 samples of commercial fermented milk containing bifidobacteria produced in Spain. Thirty percent of the samples yielded yeast counts of 102/g or higher and 40% gave mold counts of 10/g or higher. In the nine samples in which the presence of yeasts was detected, Torulopsis Candida was the only species identified. A total of five molds was isolated and identified as belonging to the genera Aspergillus, Penicillium, Mirothecium, Paecylomices, and Mycogene. In two samples (10%), Aspergillus flavus (group) was detected.

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