Background: \- Malaria is a disease that affects many people in African countries. It is caused by germs that are spread by mosquito bites. It can be fatal if not diagnosed and treated right away. Children younger than 5 and pregnant women are most at risk to get malaria. Researchers want to create a vaccine that will prevent malaria infection during pregnancy.

Objectives: \- To create a vaccine that will prevent malaria infection during pregnancy. To assess possible vaccines using in-vitro tests with parasites taken from pregnant women.

Eligibility: \- Pregnant women ages 15-25

Design: * The study site is an area in Mali, West Africa. * Participants: * Will have blood drawn. * Will give consent for the blood sample to be used for future research. * May have a physical exam. * Participants who have malaria or anemia will get treatment.