Levodian flu was an illness harmless to most humanoids. Its symptoms included fever, chills, and the sniffles. In 2154, Antaak's attempts to create Klingon augments resulted in a mutated form of the Levodian flu virus. (ENT episode: "Affliction") Information about this type of flu could be found in the USS Voyager's computers by 2376. (VOY video game: Elite Force) In 2409, the chief medical officer of Listening Post Hephaestus, Lieutenant Livok, reported two cases of Levodian flu. (STO mission: "Mine Enemy")