Albumin and LDH in BAL. Lactobacillus casei was orally administrated at a dose of 109 cells for 2 d before challenge with the pathogen; C group mice were infected without previous treatment. (A) Albumin content and (B) LDH activity in BAL were evaluated. Results are expressed as means ± SD (n = 5 or 6). *Significantly different from the C group and basal values (p < 0.05).