Final answer:
The observation of oocysts in feces for identification is related to Cryptosporidium, which causes the intestinal illness cryptosporidiosis. Diagnosis is made through a stool O&P exam and can be confirmed with various staining and analysis techniques.
Step-by-step explanation:
Identification of protozoan infections based on the observation of oocysts in feces refers to the diagnosis of Cryptosporidium. This parasite is often responsible for the intestinal illness cryptosporidiosis and can be confirmed by a stool O&P (ova and parasite) examination. Cryptosporidium oocysts display a distinctive blue halo when viewed using ultraviolet fluorescence microscopy.
While oocysts might be directly observed under the microscope, additional diagnostic methods such as acid fast staining, enzyme immunoassays, and molecular analysis like PCR may also be utilized to ascertain the presence of this parasite.