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The effect of S-PT84, a heat-killed preparation of Lactobacillus pentosus on growth of Candida albicans was examined in vitro and in vivo. The mycelial growth was effectively inhibited by S-PT84 and seemed to bind to the hyphae. We assessed the potential of S-PT84 for treatment of oral and gastric candidiasis using a murine model. When 2mg of S-PT84 was administered three times into the oral cavity of orally Candida infected mice, the score of lesions on the tongue was improved on day 2. When 50μl and 200μl of S-PT84 (10mg/m/) were administered three times into the oral cavity (0.5mg × 3) and the stomach (2mg × 3) of the same mouse model, the number of viable Candida cells in the stomach was reduced significantly on day 2. These findings suggest the possibility that S-PT84 has potential as a food ingredient supporting anti-Candida treatment, especially for Candida infection in the gastrointestinal tract. [ABSTRACT FROM AUTHOR]