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In this report the efficacy of 3 different probiotics (Bacillus cereus "toyoi", Lactobacillus spp. and Streptococcus faecium) was investigated. They were supplemented in the food of recently weaned piglets that were orally infected with E. coli 0141 K85 ab. Supplementation could not prevent mortality and clinical symptoms nor reduce the faecal excretion of hemolytic E . coli. The possible explanations for the unsatisfying results are various.

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