Important Days National Dengue Day ▪ National Dengue Day is observed on May 16 every year to spread awareness about Dengue. ▪ The day is observed by the Ministry of Health and Family Welfare (MoH & FW). ▪ Theme 2024 : “Connect with Community, Control Dengue.” Note ✓ Dengue is a viral disease. ✓ It is caused by the bite of infected female Aedes aegypti mosquito.