The subject invention provides therapeutic compositions for use in the treatment of porcine epidemic diarrhea, comprising administering to the subject a composition comprising one or more free amino acids selected from lysine, glycine, threonine, valine, tyrosine, aspartic acid, isoleucine, tryptophan, asparagine, and serine； and optionally, therapeutically acceptable carriers, electrolytes, vitamins, buffering agents, and flavoring agents.
