A study conducted on the Dogon and the Fulani people of Mali, who live within the same environment but respond very differently to P. falciparum infections (Fulani are more resistant to malaria than the Dogon), found that IL-6, IL-8, IL-12 and IFN-γ levels in uninfected Fulani children were much higher than in uninfected Dogon children. Here, IL6 is linked to malaria.