Ep. 183: Sakura suspects a chakra virus after a flashback involving Naruto and Tsunade.

183

Choji tells Sakura that fools never catch a cold, prompting her to recall being sneezed on by Naruto during Tsunade’s early days as Hokage. Upon seeing Tsunade, Sakura collapses, leading the Hokage to diagnose her with a chakra virus, a disease from another village that converts chakra into a severe flu. Because Naruto recently visited that location on a mission, Tsunade orders Shizune and medical ninja to capture him, enlisting Choji, Kiba, and Shino for assistance. They find Naruto hiding in Sasuke’s hospital room, but he is cleared of infection; his sneeze was caused by pepper in his pocket, which triggered Sakura’s allergy. Tsunade refuses to apologize for the incident, dismissing the capture as an emergency drill.