Isolation and characterization of anti-Salmonella lactic acid bacteria from the porcine gastrointestinal tract

Aims: To identify lactic acid bacteria (LAB) of porcine intestinal origin with anti‐Salmonella activity. Methods and Results: Samples were obtained from pig faeces and caeca and screened for the presence of anti‐Salmonella LAB. The 11 most promising isolates were identified as belonging to the genera Lactobacillus and Pediococcus. The LAB exhibited large variation in their ability to survive in simulated gastric juice at pH 1·85. While Lactobacillus johnsonii species survived at levels of 80% for up to 30 min, Lactobacillus pentosus species declined to