Singapore Immunology Network

The trial aims to evaluate role of metabolic factors including systemic 25-OH D and diabetes in the adaptive immune response (haemagluttination inhibition titer) to influenza vaccine in the elderly. The influenza vaccine administered in this study will be licensed trivalent inactivated influenza vaccine. Elderly who are age above 65 including those with co-morbidities such as diabetes mellitus will be included. The study has its inclusion and exclusion criteria to determine eligibility for participation.