Asymptomatic African malaria carriers were treated as a danger demanding hygiene measures.

Evidence

This measure was inspired in part by the realization that many Africans carried the parasite but showed no clinical symptoms of malaria. All Africans thus posed a danger to Europeans. — Alice L. Conklin, A Mission to Civilize_ The Republican…, 1041

Categorization

• XREF: Connects to broader colonial-medicine literature where Africans were framed as disease reservoirs justifying segregation; echoes sickle-cell/malaria coevolution themes in medical anthropology.