Lactobacillus reuteri reduced the duration of diarrhoea after 24 h ( p < 0.001 ) and more diarrhoea-free children were seen in the L. reuteri than control group after 24 and 48 h ( 50 % versus 5 % , p < 0.001 ) and 72 h ( 69 % versus 11 % , p < 0.001 ) .