Warthin-Starry stain and Dieterle stain These silver stains are used to visualize bacteria such as Spirochetes Helicobacter pylori Microsporidia Bartonella henselae (the cause of cat-scratch disease) Wright stain and Giemsa stain These stains are used for detection of the following: Parasites in blood Histoplasma capsulatum in phagocytes and tissue cells Intracellular inclusions formed by viruses and chlamydia Trophozoites of Pneumocystis jirovecii Some intracellular bacteria Trichrome stain (Gomori-Wheatley stain) and iron hematoxylin stain These stains are used to detect intestinal protozoa.