<p>SEM of <i>Cryptosporidium</i> oocysts collected from stool of infected mice on the 19^th day PI.</p>

<p><b>(A)</b> Non treated oocysts viewing characteristic rounded shape with intact regular smooth body (x20,000); <b>(B)</b> NTZ treated oocysts appearing compressed with outer rough surface (x20,000); <b>(C–E)</b> OL-treated oocysts showing (C&D) Irregular shrunken body surface (x20,000); (C) Numerous dimples (x20,000); (D) Widespread pits and small protrusions (x20,000); <b>(E)</b> Distorted body with large papules (x15,000); <b>(F–H)</b> <i>B. clausii</i> treated oocysts illustrating (F&G) Reduced size (x20,000); (F) Indented irregular outer surface with multiple bullae (x20,000); (G) Apparently distended polyps (x20,000); <b>(H)</b> Prominent spikes (x15,000); <b>(I–K)</b> Combined OL & <i>B. clausii</i> treated oocysts demonstrating (I) Markedly disfigured body (x20,000); (J) Obviously swollen mutilated parasite with profound depressions (x15,000); (K) Ruptured organism with evident fissure throughout its diameter (x15,000).</p>