Welcome, Dr. Choong King Yen (right) from National Institute of Health (NIH), Malaysia, to undertaking “Clinical Observership Training Program in Immunology” at the Department of Immunology, Faculty of Medicine Siriraj Hospital under the supervision of Assoc. Prof. Yuttana Srinoulprasert (left) and Asst. Prof. Wiwit Tantibhedhyangkul between March 1st, 2022 – June 30th, 2022. Dr. Chung aims to learn new advanced testing and technologies in the diagnosis of primary immunodeficiency disease.