Ch?ji says to Sakura that "Fools never catch a cold", which leads Sakura to have a flashback of catching Naruto's cold. When Sakura sees Tsunade at her office, she collapses to which Tsunade claims Sakura has an illness known as a chakra virus. It was an illness long ago in another village that would turn chakra into a terrible flu and Naruto recently went to that village for a mission. Tsunade, not wanting to scare the villagers, orders Shizune and a team of medical ninja to capture Naruto. After getting results from Naruto, Shizune tells Tsunade that he doesn't have the chakra virus but sneezed due to pepper he had in his pocket and Sakura just had an allergic reaction from Naruto's sneeze. After he is released, Naruto demands an apology from Tsunade for her mistake though Tsunade says it wasn't a mistake and it was just an "emergency drill".