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Antibiotics were far superior to acidification for controlling bacteria when counting fungi in foods. Yeast and mold counts from Potato Dextrose Agar containing antibiotics were much higher than those obtained in the acidified medium, and growth of bacteria was never a problem. When incubation temperatures of 32 and 22 C were compared, more colonies appeared at 22 C.
John A. Koburger (1970) studied this question.