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[Isospora belli]

Oocysts of Isospora belli can also be stained with acid-fast stain, and can be visualized by epifluorescence on wet mounts, as illustrated.  Three coccidian parasites that most commonly infect humans, seen in acid-fast stained smears (A, C, and F), bright-field differential interference contrast (B, D, and G) and epifluorescence (E and H, C. parvum oocysts do not autofluoresce).