A method of retarding or treating rotavirus infection in a subject, comprising administering to the subject a composition comprising an anti-rotavirus effective amount of an agent selected from the group consisting of defatted human milk fat globule, the human milk macromolecular fraction, the human milk mucin-70 Kd apparent MW glycoprotein-46 Kd apparent MW glycoprotein complex, the 46 Kd apparent MW glycoprotein, a polypeptide comprising an amino acid sequence having the rotavirus-binding specificity of the 46 Kd apparent MW HMFG glycoprotein, deglycosylated proteins thereof, mixtures thereof, and mixtures thereof with human skim milk, curd, or whey.