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Abstract

A lactic acid bacterium belonging to Streptococcus thermophilus, satisfying at least one of the conditions selected from the group consisting of the following (a) and (b):

(a) when cultured at 43° C. in a 10% skimmed milk powder medium, (a1) the time from start of the culture until a pH of a culture solution becomes 4.7 or lower is 7 hours or less, and (a2) the pH of the culture solution 20 hours after the start of the culture becomes 4.1 or higher, and(b) when cultured until the pH of the culture solution becomes 4.7 or less in a 10% skimmed milk powder medium at 43° C., followed by storage at 10° C. for 10 days, (b1) a viable bacterial count in the culture solution after the storage becomes 1×108 cfu/g or more, and (b2) the pH of the culture solution after the storage becomes 4.2 or higher.

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First Claim