Iron Absorption and Utilization in Adolescents Infected With Malaria Parasites, Hookworms or Schistosoma

Inclusion Criteria: * Children aged 12 to 16 years * Body weight \> 30 kg * no chronic medical illnesses * no intake of vitamin/mineral supplements 2 weeks before the study and until the last blood drawing * For each of the 4 arms the respective disease needs to be present (symptomatic malaria, asymptomatic malaria, hookworm infection, S. haematobium infection) without any other concurrent infection Exclusion Criteria: \-