Infectious diseases are caused by various microorganisms that can cause illness under certain conditions. Some diseases can be passed between people through person-to-person contact, others through bites from insects like mosquitoes, and still others by ingesting contaminated food, water, or exposure to microorganisms in the environment. Dengue virus is transmitted by daytime-biting Aedes aegypti and Aedes albopictus mosquitoes, which can also spread Zika, chikungunya, and other viruses. Dengue has no treatment but the disease can be managed early. Aedes mosquitoes are visually distinctive from other mosquitoes as they have noticeable black and white markings and only bite during the day,