Pneumocystis
carinii
- Impression smear,
mouse lung, Giemsa-stained
- Cyst appear as
"halo", about 5 micrometer in diameter
- Intracystic bodies are
small, 1-2 micrometer,
each has reddish nucleus and blue cytoplasm
- Trophozoites can be
seen as minute bodies distributed
all over the smear
- Recently classified as
a fungus