Although malaria is both preventable and treatable, it is endemic to over 100 countries worldwide, with over 200 million cases occurring each year. Children and pregnant women are particularly at risk of malarial infection, transmitted through a parasite that cycles through mosquitoes and humans. Malaria can be prevented through the use of insecticide-treated bednets, indoor residual spraying, and projects that reduce standing water in communities. The disease can be treated with medication, although the development of resistance remains a concern in some areas.