S2·E4 H. Pylori/Antigenic Shift

An incident has occurred in the body! The Immune Cells rush to the scene and fight the cells infected by a virus. An Ordinary Cell observes this everyday scene with a bored look on his face and says to himself, "I want to heroically save somebody and have them say to me, 'Thank you for helping me.'" A group of mysterious bacteria appear in front of the Ordinary Cell and...