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[Pneumocystis jiroveci]

Pneumocystis jiroveci cysts.

A	B

A: 3 cysts in bronchoalveolar material, Giemsa stain; the rounded cysts (size 4 to 7 µm) contain 6 to 8 intracystic bodies, whose nuclei are stained by Giemsa; the walls of the cysts are not stained; note the presence of several smaller, isolated trophozoites.

B: cysts in lung tissue, silver stain; the walls of the cysts are stained black; the intracystic bodies are not visible with this stain; baby who died with pneumonia in California.