Figure 1. Dose effects of L. rhamnosus on diarrhoea scores of piglets following F4⁺ETEC challenge.

Piglets received sterile physiological saline orally (CONT); received sterile physiological saline orally followed by F4⁺ETEC challenge (ETEC); were pretreated with low-dose 10⁹ CFU/ml L. rhamnosus solution for 1 week followed by F4⁺ETEC challenge (LDLE); or were pretreated with high-dose 10¹¹ CFU/ml L. rhamnosus solution for 1 week followed by F4⁺ETEC challenge (HDLE). Data are presented as means ± SEM (n = 5 per group). Within the same time, mean values with different superscript letters (^{a, b}) are significantly different (P<0.05).