Clinical course of long COVID symptoms after vaccination (a) Time course of long COVID in vaccinated patients. Fifteen participants reported resolution of some COVID-19 symptoms after vaccination. Eleven reported complete resolution of all symptoms: one after the first vaccination, eight after the second vaccination, and two after the third vaccination. (b) Detailed trends in the improvement of long COVID symptoms during clinical course Participants reported improvements in several types of long-term COVID symptoms after vaccination; dyspnea and alopecia improved most frequently. Symptoms, such as sleep disorders, myalgia, hypersensitivity, eruption, and sputum, persisted until the end of the follow-up period.