With this prospective cross sectional study among healthy individuals in rural west-Africa we aim to address several research questions at the same time. This study will assess the influence of (time-point of) vaccination on morbidity, mortality and immune status among healthy individuals in a rural sub-Saharan African setting. Secondly, to explore the prevalence of subclinical malaria, iron deficiency anemia, sickle cell anemia and thallasemia among a healthy rural sub-Saharan African population. And finally to assess normal hemocytometry values among a healthy rural sub-Saharan African population.