Fuente: WIPO "milk" An object of the present invention is to provide a technique for preventing infection of pathogenic viruses, which cause infectious diseases in animals or humans. A nutritional composition containing lactoferrin and/or lactoferrin hydrolysate, and human milk oligosaccharide is provided. One or more human milk oligosaccharides are preferably 2′-fucosyllactose, 3-fucosyllactose, 3′-sialyllactose, and 6′-sialyllactose. The nutritional compositions of the present invention can be used for preventing infection, especially for preventing viral infection.