Provided are methods of treating diarrhea, particularly malabsorption diarrhea, in neonatal, young and adult non-human animals, in which the diarrhea results from infection of the animals by Salmonella spp., such as Salmonella typhimurium, with a therapeutically effective amount of a proanthocyanidin polymer from Croton lechleri, in either enteric or non-enteric form.
