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Confocal observation of Cryptosporidium extracellular developmental stages identified within six day old Cryptosporidium-exposed biofilms. A) excysted oocyst (indicated by arrowhead) with newly released slender sporozoite (indicated by arrow). B) comma shaped sporozoite; C) circular-shaped trophozoite; D and E) types I and II meront respectively. Scale bars: A: 20 μm; B&C: 2 μm; D&E: 5 μm.
