Giemsa stain
Giemsa stain is also a differential stain, such as when it is combined with Wright stain to form Wright-Giemsa stain. It can be used to study the adherence of pathogenic bacteria to human cells. It differentially stains human and bacterial cells purple and pink respectively. It can be used for histopathological diagnosis of the "Plasmodium" species that cause malaria and some other spirochete and protozoan blood parasites. It is also used in "Wolbachia" cell stain in "Drosophila melanogaster".