Mosquitoes bring about painful bites and itchy skin reactions, and cause an annoying buzzing sound. These insects also spread serious diseases to the human population. In fact, the American Mosquito Control Association says mosquitoes cause more human suffering than any other organism. Each year, more than a million people in the world die from mosquito-borne illnesses. In humans, mosquitoes cause malaria, chikungunya, dengue fever, yellow fever, West Nile virus, and various forms of encephalitis.