Abstract: A bacterial preparation useful for the prophylaxis of intestinal bacterial infections, especially Campylobacter infections, in poultry comprises bacteria derived from an adult bird from the same microecological niche, especially in the caecum, where the pathogenic bacteria tend to propagate in newly hatched chickens.

Abstract: The invention provides a bacterial preparation for the prophylaxis of intestinal disturbances, especially salmonella infections, in poultry, made by anaerobically cultivating either separately or together bacterial strains of normal alimentary tract bacterial species, optionally in the presence of epithelial cells from the alimentary tract, for example the crop of a poult, and isolating the cultivated bacteria from the nutrient medium and making a preparation of them, for instance by lyophilization. The only bacterial strains used are those having an adhesion efficiency onto the epithelial cells of the alimentary tract of the poult of at least 10 bacteria per epithelial cell.

Abstract: This invention provides a composition useful in the treatment or prophylaxis of disturbances in the normal intestinal bacteria flora in poultry. The composition is intended to be administered as an aqueous mixture and it contains anaerobic bacteria of intestinal origin and an agent, preferably cysteine, which decreases the toxic effect of the oxygen dissolved in the water, and preferably also a substantially neutral buffer.