Effective preventive method for infectious diseases, an enhancing method
of an infectious disease-preventive action of cysteine and composition,
food and feed effective for infectious diseases are provided.
A method of preventing infectious diseases wherein cystine and the like
and theanine are administered in combination, a method of enhancing an
infectious disease-preventive action of cystine and the like, which
contains administering cystine and the like and theanine in combination,
a pharmaceutical composition, food and feed wherein cystine and the like
and theanine are combined.
