Dr Justina Tan is a senior consultant in the Department of Rheumatology, Allergy and Immunology. She leads the Immunodeficiency Service in the department and is currently the principal investigator of the Immunodeficiency disorders registry. As a recipient of a team Ministry of Health Manpower Development Plan (HMDP) scholarship, she completed an overseas attachment in Auckland City Hospital, New Zealand in 2003 on Immunodeficiency disorders.