Why should I be concerned about mosquitoes?

Mosquitoes are one of North America’s most dangerous pests.  As noted, some species transmit West Nile virus and other viruses that cause encephalitis, or swelling of the brain, and other illnesses, resulting in seasonal epidemics in North America during summer and fall.  According to the CDC, symptoms of West Nile disease can include high fever, headache, neck stiffness, muscle weakness, disorientation and paralysis.  Mosquitoes also pose a danger internationally where they can carry and transmit the infectious agents that cause malaria, lymphatic filariasis, yellow fever and dengue fever. But more commonly they are just a nuisance for outdoor activities.