CELLS OF LACTIC ACID BACTERIA, WHICH HAVE BEEN OBTAINED BY CONTROLLING pHs OF MEDIA IN A CULTURING STEP AND PROCESSING STEPS TO A NEUTRAL RANGE OF, FOR EXAMPLE, FROM 5 TO 8 OR SO, HAVE A MODE VALUE (PARTICLE SIZE) OF 1.0 [MU]M OR SMALLER IN THEIR PARTICLE SIZE DISTRIBUTION. CELLS OF NANO-SIZED LACTIC ACID BACTERIA WHICH HAVE SUCH A SMALL PARTICLE SIZE ARE EXCELLENT IN INF-+- PRODUCING CAPACITY AND ARE ALSO SUPERB IN WATER DISPERSIBILITY.