Helminthology Exam

A necropsy on a carabao revealed the presence of a long and slender worm in nodules on the walls of the aorta. The worm presents with a tightly coiled tail. What is this parasite?

Elaeophora poeli

Which of the following is not a reliable diagnostic method for detecting Oxyuris equi?

Demonstration of ova through direct fecal smear

This parasite is associated with a swollen nictitating membrane and cheesy lacrimal exudate in turkeys.

Oxyspirura mansoni

This is a pinworm found in lagomorphs

Passalurus ambiguous

A necropsy of a turkey showed extensive petechial hemorrhages on the thickened wall of cecum, with areas of inflammation and ulceration of the caecum and liver. Fecal samples present with oval-shaped embryonated eggs with thick, smooth shells. What helminth parasite is associated with this case?

Heterakis gallinarum

What set of description is true for strongyle egg?

Oval, smooth and thick-shelled, and embryo is segmented when laid

The following nematodes are bursate worms, except?

Strongyloides stercoralis

The following are known can pass larvae to offsprings via transuterine transmission, except?

Toxocara cati

“Creeping eruptions” in man, which is characterized by a snake-like rash on the skin of the hands and feet, most commonly occurs in owners of dogs that is infected by what parasite?

Ancylostoma caninum

This refers to when the life cycle of a parasitic nematode becomes arrested during the dry season

Hypobiosis

This parasite is associated with causing eosinophilic meningoencephalitis when man is infected

Angiostrongylus cantonensis

The L3 of the following nematodes can infect the definitive host by active penetration, except?

Ostertagia ostertagi

This parasite is associated with formation of raised, greyish nodules on the subpleural surface of the lungs of cats

Aelurostrongylus abstrusus

The following are modes of infection by Ancylostoma caninum, except?

Transplacental transmission

Haemorrhagic diarrhea in newborn, suckling piglets are associated with transmammary infection by which parasitic nematode?

Strongyloides ransomi

The following statements are true about the modes of infection of Toxocara canis, except?

No somatic migration occurs in the fetus in infection by prenatal transmission

This parasite is associated with the formation of yellow mosaic lesions on the surface of the liver

Gnathostoma spinigerum

The following statements are true about Tetrameres americana, except?

The hatched L1 must be ingested by a cockroach or grasshopper

This is the intermediate host of Capillaria philippinensis?

Freshwater fish

The metacercaria of the following flukes are found in fishes, except?

Fishoederius cabboldi

Findings in a necropsy of a sheep includes the presence of traumatic hepatitis and the formation of semi-transparent cysts up to 6 cm in diameter all over its mesenteries. What parasite is associated with this case?

Taenia hydatigena

The following drugs are used for the treatment and prevention of cestodes, except?

Ivermectin

Which of the following digenean larval stages are not present in Schistosoma?

Radia

The intestinal mucosa of a pigeon presented with hemorrhages, with areas of necrosis particularly in the duodenum. A small tapeworm was obtained from scapings of still healthy mucosa. What parasite is associated with this case?

Davainea proglottina

This is a large posterior adhesive organ found in monogeneans fluke

Opisthaptor

A dog’s liver showed extensive fibrosis of the bile ducts leading to occlusion and subsequent inflammation of the gall bladders. Fecal samples also show oval eggs with an operculum on one end and a small knob on the other pole. History of the patient also revealed that the dog is fed raw fish. What parasite is associated with this case?

Clonorchis sinensis

This is a common tapeworm affecting man in subtropical areas and have been associated with accidental ingestion of rat fleas.

Hymenolepis nana

Which of the following statements is the best way to distinguish the eggs of Paramphistomidae from Fasciolidae?

The location of the operculum is on the sharp end

The following tapeworms have double-pored per segment, except?

Taenia solium

This is the metacestode of Taenia multiceps

Coenurus cerebralis

Although the prevalence of Taenia saginata infections in dogs are rare, the ability of the parasite to still be able to infect them is an example of what type of transmission?

Zootithasonosis

The formation of cysts containing a single invaginated scolex in the brain of man is due to?

Auto-infection of Cysticercus cellulosae in man

This is the snail intermediate host of Echinostoma ilocanum were the sporocyst develops.

Gyraulus convexiusculus

The following statements are true about monogenean flukes, except?

They require at least 1 intermediate host

What is the cause of human sparganosis?

Development of the plerocercoid in the muscle of man

The scolex and anterior proglottids of this ruminant tapeworm becomes embedded in the intestinal mucosa, leading to the formation of nodules.

Stilesia globipunctata

The eggs of this species of Schistosoma are elongated, spindle-shape and possess a terminal spine on one pole

Schistosoma intercalatum

This equine tapeworm causes the formation of ulcerative lesions on the mucosal surface of the intestines at the ileo-cecal junction.

Anoplocephala perfoliate

This immature form of this parasite is located in the muscles of freshwater fishes

Diphyllobothrium latum

The following are the preferred predilection sites of Cysticercus cellulosae in the intermediate host, except?

Diaphragm

What is the pathogenesis of hepatic fibrosis as a result of fascioliasis?

Prolonged and reoccurring infections of Fasciola in the liver

This digenean larval stage possesses a ciliated epidermis.

Miracidium

The following species of Hymenolepis are found in rodents, except?

Hymenolepis lanceolata

Which is not a characteristic of a freshly voided taeniid egg?

Larvated

Taenia pisiformes occurs in what host?

Dog

The following statements are true about class Trematoda, except?

Can be both endoparasitic and ectoparasitic

The following trematode families have intestinal tracts that end into 2 blind ceca, except?

Schistosomatidae

Which of the following monogenean flukes are viviparous?

Gyrodactylus elegans

This fluke causes decalcification of the bony walls of the frontal sinuses in minks.

Troglotrema acutum

Dogs suffering from salmon poisoning have been infected by what fluke?

Nanophyetus salmincola

What is the prepatent period of Fasciola hepatica in the sheep?

10 weeks

The following are predilection sites of Prosthogonimus pellicodus in ducks, except?

Pancreatic duct

The liver and other abdominal organs of a pig present with areas of thickened tissues, forming a fibrous capsule. Excision of this lesions shows the presence of black iron porphyrin pigments. The feces of the animal also present large, oval, thin-shelled eggs with an operculum on one pole. Which of the following parasites is likely associated with this case?

Fascioloides magna

What is the best way to distinguish Raillietina echinobothridia from Raillietina tetragona?

The absence of neck

This is a type of host wherein biological development of an immature parasite does not occur, but it has the potential to transmit the parasite to its final host.

Paratenic host

Immature forms of parasites with a tendency to localize in the muscles and subcutaneous tissues of prey animals are more likely to be transmitted to their definitive host by way of?

Foodborne transmission

The following statements are true about Dipylidium caninum, except?

The definitive host is infected by accidental ingestion of fleas, ticks, and lice

What is the average prepatent period for most species of Schistosoma?

6-7 weeks

The pseudoscolex is a feature found in?

Fimbriaria fasciolaris

Radiographs of a cat’s lungs showed the presence of small oval lesions. The patient’s fecalysis also showed brown oval eggs with a distinct operculum. What parasite is associated with this case?

Paragonimus kellicotti

Intensive management in poultry has reduced cestode infections, but this species can still remain a problem because its intermediate host is Musca domestica.

Choanotaenia infundibulum

Horses become infected with Anoplocephalidae tapeworms through the ingestion of what intermediate host?

Oribatid mite

Which of the following does not describe cestodes from subclass Cotyloda?

The gravid proglottids detaches to be passed out in feces

A carabao with a history of mucopurulent nasal discharges was exhibiting snoring sounds while respiring, indicating a possible blockage in the nasal passages. Rhinoscopic examination showed the presence a granuloma on the nasal mucosa. Which one of the following parasites is likely associated with this case?

Schistosoma nasalis

Formation of nodules and hyperplastic thickening on the small intestine of fowls is associated with infection of which tapeworm?

Raillietina echinobothridia

What is the best way to distinguish Diphyllobothrium latum from Spirometra mansoni?

Rosette-shaped central uterus

Death of the host by amphistomes are the result of?

Immature flukes feeding on the small intestinal mucosa

This is a type of metacestode that does not have an invaginated scolex but is attached to a fluid-filled bladder by a segmented strobila.

Strobilocercus

The following statements are the best factors for the pathogenicity of schistosomiasis, except?

Anemia as a result of ingestion of blood by the adult flukes