Malaria is a disease caused by protozoan parasites called Plasmodium. It is usually transmitted through the bite of an infected female Anopheles mosquito. Malaria may also be transmitted through the following:

• Transfusing blood that is positive for malaria parasites
• Sharing of IV needles (especially among IV drug users)
• Transplacenta (transfer of malaria parasites form an infected mother to her unborn child)