Evaluation of the immune benefits of two probiotic strains Bifidobacterium animalis ssp. lactis, BB-12 ® and Lactobacillus paracasei ssp. paracasei, L. casei 431 ® in an influenza vaccination model: A randomised, double-blind, placebo-controlled study
British Journal of Nutrition, Volume 107, No. 6, Year 2012