Effects. of a fennented milk drink containing Lactobacillus casei strain Shirota on the immune system in healthy human subjects

Nine healthy volunteers drank fermented milk containing 4x10(10) live cells of Lactobacillus casei strain Shirota daily for 3 weeks, and their NK activity and other immunological functions were measured, NK activity significantly increased (p<0.01) 3 weeks after the start of intake and remained elevated for the next 3 weeks. The effect was particularly prominent in low-NK-individuals.