13 AbstractSYNBIOTIC MIXTURE5 This invention relates to a preparation comprising N-acetyl-lactosamine and/or an oligosaccharide containing N-acetyl-lactosamine and a probiotic Lactobacillus sp. The invention extends to nutritional compositions comprising said preparation and to the use of the preparation in the prevention and treatment of pathogenic infections of the gastro intestinal and upper respiratory tracts.10