MT 26 (LEC): Intestinal Coccidians

True or False: All medically important coccidians are acid-fast positive.

True.

Fill in the blank: is the only intestinal coccidian with no sporocyst inside its oocyst.

Cryptosporidium parvum.

Identify the infective and diagnostic stage of coccidians.

Oocyst.

True or False: Isospora belli requires an intermediate host in its life cycle.

False.

Fill in the blank: has oocysts that are spherical and larger than C. parvum, and acid-fast variable.

Cyclospora cayetanensis.

Identify the method used to recover refractile coccidian oocysts.

Sheather’s sugar flotation method.

True or False: Sarcocystis infection in humans can result in muscle sarcocysts.

True.

Fill in the blank: is acquired by ingesting undercooked meat containing sarcocysts.

Sarcocystis spp.

What is the gold standard stain for Cryptosporidium oocyst detection?

Modified acid-fast stain.

True or False: Cyclospora cayetanensis oocysts are already sporulated when passed in feces.

False.

Fill in the blank: The oocysts of are elliptical and contain two sporocysts each with four cigar-shaped sporozoites.

Isospora belli.

True or False: Cryptosporidiosis is often self-limiting in immunocompetent individuals.

True.

What is the principal reservoir host for Cryptosporidium parvum?

Cattle.

Identify the most recommended stain for detecting Cyclospora cayetanensis.

Modified acid-fast stain.

True or False: Oocysts of Sarcocystis spp. are sporulated and acid-fast.

True.

Fill in the blank: is a condition associated with ingestion of contaminated raspberries.

Cyclosporiasis.

True or False: Sarcocystis infection in humans is acquired via zoonotic transmission through undercooked meat.

True.

Identify the parasite whose oocysts are spherical, 8–10 µm, and acid-fast variable.

Cyclospora cayetanensis.

What condition is characterized by acid-fast oocysts, diarrhea, and weight loss, particularly in AIDS patients?

Isosporiasis.

Fill in the blank: method is used for detecting coccidian oocysts using sugar boiled in phenol.

Sheather’s flotation.

Fill in the blank: oocysts have no sporocyst but contain four naked sporozoites.

Cryptosporidium parvum.

What diagnostic method is highly recommended for identifying acid-fast oocysts?

Modified acid-fast stain.

True or False: Sarcocystis infection always presents with muscle pain.

False.

Identify the Sarcocystis species that infects humans through undercooked pork.

Sarcocystis suihominis.

Fill in the blank: Sarcocystis infection in humans can occur when they serve as the .

Intermediate host.

What species is associated with ingestion of contaminated raspberries?

Cyclospora cayetanensis.

True or False: Cryptosporidium parvum is a zoonotic infection.

True.

Fill in the blank: appear glassy and wrinkled when unstained under the microscope.

Cyclospora oocysts.

What is the recommended flotation technique for coccidian detection?

Sheather’s sugar flotation.

True or False: All intestinal coccidians have acid-fast oocysts.

True.

Fill in the blank: The thick double-layered wall is a characteristic of oocysts.

Cryptosporidium.

What form is responsible for relapse in coccidian infections like Isospora and Sarcocystis?

None; they do not relapse.

True or False: Cryptosporidium oocysts are infectious immediately when passed.

True.

Identify the method that uses ocular micrometer for coccidian detection.

Fecal microscopy.

Fill in the blank: contains cigar-shaped sporozoites and two sporocysts.

Isospora belli.

True or False: Cyclospora cayetanensis is often diagnosed using electron microscopy.

True.

What form of reproduction occurs in Sarcocystis muscle infection?

Asexual.

Fill in the blank: can be used to diagnose Sarcocystis in muscle biopsy.

Histological staining.

Identify the group of patients most at risk of chronic Cryptosporidiosis.

HIV-AIDS patients.

True or False: Sarcocystis causes zoonotic infections when humans ingest animal feces.

True.

What is the primary symptom of Sarcocystis when humans serve as definitive host?

Diarrhea.

Fill in the blank: is the cause of muscle sarcocystosis in dead-end human infection.

Sarcocystis lindemanni.

True or False: Only Cyclospora oocysts are acid-fast variable.

True.

Identify the coccidian with smallest oocyst size.

Cryptosporidium parvum.

What drug is used for all symptomatic intestinal coccidian infections?

Trimethoprim-sulfamethoxazole.

Fill in the blank: Oocysts of contain 2 sporocysts, each with 2 sporozoites.

Cyclospora cayetanensis.

True or False: Entero test can help recover Isospora oocysts.

True.

Identify the diagnostic form seen in Giemsa-stained stool smear.

Oocyst.

Fill in the blank: has the thickest oocyst wall among intestinal coccidians.

Cryptosporidium.

True or False: AIDS patients may have severe, prolonged diarrheal illness from Isospora.

True.

What coccidian parasite shows relapse of diarrhea after a few days of remission?

Cyclospora cayetanensis.

Fill in the blank: causes sarcocystosis without muscle symptoms when humans are definitive hosts.

Sarcocystis suihominis.

True or False: Cyclospora is more prevalent during summer and rainy seasons.

True.

Identify the type of reproduction occurring in intestinal epithelium in Cryptosporidium.

Asexual and sexual.

Fill in the blank: causes diarrhea after ingestion of tissue cysts in pork or beef.

Sarcocystis spp.

True or False: Cryptosporidium oocysts stain bright pink with acid-fast stain.

True.

What organism has the largest oocyst among intestinal coccidians?

Isospora belli.

Fill in the blank: is the diagnostic stage of Sarcocystis in feces.

Oocyst or sporocyst.

True or False: AIDS patients infected with Cyclospora may develop chronic wasting.

True.

Identify the site of asexual reproduction in Sarcocystis muscle infection.

Human striated muscle.

Fill in the blank: are helpful in Cyclospora diagnosis when oocysts are faintly stained.

Electron microscopy.

True or False: Zoonotic transmission does not occur in Isospora infection.

True.

What infection shows high relapse rate among immunocompromised patients?

Cyclosporiasis.

Fill in the blank: is the definitive host in Sarcocystis bovihominis infection.

Human.

Identify the host of Cryptosporidium parvum commonly associated with zoonosis.

Cattle.

True or False: Modified Ziehl-Neelsen stain is another name for acid-fast staining.

True.

Fill in the blank: Oocyst maturation in the environment is necessary for transmission.

Isospora and Cyclospora.

True or False: Sarcocystis oocysts may be passed unsporulated in stool.

True