|ANIME DEBUT||Episode 3|
|MANGA DEBUT||Chapter 3|
Influenza virus (インフルエンザウイルス Infuruenza Uirusu?) is the cause of influenza. In virus classification, influenza viruses are RNA viruses that make up four of the seven genera of the family Orthomyxoviridae.
An influenza virion is depicted as a red ball with grey surface protein-like structures sticking out. When a cell is infected, it turns into a zombie with green skin, and a virion latches onto its head like a cap.