Isospora belli oocysts are typically about 25 by 18 micrometers. Which organism is this description referring to?

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Multiple Choice

Isospora belli oocysts are typically about 25 by 18 micrometers. Which organism is this description referring to?

Explanation:
Recognizing which parasite matches a given oocyst size is the key idea. Isospora belli forms relatively large oocysts that are oval to elongated, measuring about 25 by 18 micrometers. This sizable, elongated appearance distinguishes it from other intestinal coccidia: Cryptosporidium parvum produces very small oocysts around 4–6 μm, Cyclospora cayetanensis oocysts are larger than Cryptosporidium but typically about 8–10 μm, and Microsporidium spores are much smaller, only a few micrometers. The described dimensions fit Isospora belli, so that’s the organism referred to.

Recognizing which parasite matches a given oocyst size is the key idea. Isospora belli forms relatively large oocysts that are oval to elongated, measuring about 25 by 18 micrometers. This sizable, elongated appearance distinguishes it from other intestinal coccidia: Cryptosporidium parvum produces very small oocysts around 4–6 μm, Cyclospora cayetanensis oocysts are larger than Cryptosporidium but typically about 8–10 μm, and Microsporidium spores are much smaller, only a few micrometers. The described dimensions fit Isospora belli, so that’s the organism referred to.

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