Platelet aggregation activity. А. Relatively healthy patients. Aggregation response in the reference interval. Irreversible aggregation, percentage light transmission 60%; B. patients with post-COVID syndrome during treatment with basic therapy. Aggregation response in the reference interval. Irreversible aggregation, percentage light transmission 93%; С. Patients with post-COVID syndrome during treatment with basic therapy and thiotriazoline. Aggregation response in the reference interval. Irreversible aggregation, percentage light transmission 75%.