CRP and infection: Population surveys have shown that CRP levels vary across the world: Ghanaians [2], Filipinos [3], Chinese [4] and the Shuar people in Ecuador [5] have lower CRP levels than United States populations of comparable age but other studies have found opposite results: Gurven et al. compared the CRP distribution of the native Tsimane population, a Bolivian ethnic group with demonstrated high levels of childhood infections, with the US distribution [6].