Because the malaria parasite is found in red blood cells, transmission may also occur through contact with infected blood. This can occur through:
- A blood transfusion
- An organ transplant
- The shared use of needles or syringes that are contaminated with blood.
Transmission of malaria may also occur from a mother to her fetus, before or during delivery (congenital malaria).
When someone becomes infected, he or she will not feel sick immediately. The period between malaria transmission and the beginning of symptoms is called the malaria incubation period. It may be as short as seven days or as long as several years; however, it typically ranges from ten days to four weeks.