Giemsa stain

Giemsa stained Trypanosoma parasites (Chagas disease pathogen)
Whirling disease section stained with Giemsa stain

Giemsa stain (/ˈɡiːmzə/), named after German chemist and bacteriologist Gustav Giemsa, is a nucleic acid stain used in cytogenetics and for the histopathological diagnosis of malaria and other parasites.