Anti-influenza virus agent for suppressing aggravation of influenza

A method of treating or preventing influenza in a subject comprising administering an anti-influenza virus agent comprising Bifidobacterium bifidum as an active ingredient, a food product comprising Bifidobacterium bifidum as an active ingredient, or a medicament comprising Bifidobacterium bifidum as an active ingredient to the subject.

A method of suppressing aggravation of influenza in a subject comprising administering an anti-influenza virus agent comprising Bifidobacterium bifidum as an active ingredient, a food product comprising Bifidobacterium bifidum as an active ingredient, or a medicament comprising Bifidobacterium bifidum as an active ingredient to the subject.