The Medical Entomology Unit was established in 1902 with the appointment of the first Entomologist at the Institute for Medical Research. Various research on insect-borne diseases have been carried out here for 11 decades on vector biology and control of insects and their relationship to disease carried. Many of the techniques of control and suppression of disease-bearing insects used in today's modern era, originated from this unit. Medical Entomology Unit plays four important roles: Research, Training, Diagnosis and Advisory / Consultancy. Since 1985, the Unit is designated as the WHO Collaborating Centre for Ecology, Taxonomy & Control of Vectors of Malaria, Filariasis and Dengue.