5 unit（U） EC

Clinical Trial to Explore the Skin Test Dosage of EEC in People Aged 18 to 65 Years Old and the Safety and Preliminary Efficacy in People Aged 3 to 75 Years Old.

Clinical Trial to Evaluate the Efficacy and Safety of EEC for the Diagnosis of Mycobacterium Tuberculosis Infection in People Aged 3 Years and Above