Pathogenic Parasites Quiz Questions And Answers

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Questions: 60 | Attempts: 187 | Updated: May 12, 2023

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Do you know about pathogenic parasites? Check out the following quiz and test your knowledge for the same. A pathogen is an organism that causes diseases. Infectious organisms cause parasitic diseases from protozoa to helminths. The quiz below contains questions about parasites, parasitic pathogens, trematodes, and host organisms. Do you think you can answer them all and secure good marks here? Stop wasting your time and start playing the quiz. All the very best to you!

Questions and Answers

1.

Metagonimus yokogawai differs from Heterophyes heterophyes by:
- A.
  
  M. yokogawai egg is light brown and thick-shelled H. heterophyes is light yellow and thin-shelled
- B.
  
  M. yokogawai egg is light yellow and thin-sheled H. heterophyes is light brown and thick-shelled
- C.
  
  Both are correct
- D.
  
  Their eggs are indistinguishable
Correct Answer
B. M. yokogawai egg is light yellow and thin-sheled H. heteropHyes is light brown and thick-shelled

Explanation
Metagonimus yokogawai differs from Heterophyes heterophyes based on the color and thickness of their eggs. The correct answer states that M. yokogawai eggs are light yellow and thin-shelled, while H. heterophyes eggs are light brown and thick-shelled. This indicates a clear distinction between the two species in terms of their egg characteristics.

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2.

The common name of Paragonimus westermani is:
- A.
  
  Von Siebold's fluke
- B.
  
  Intestinal fluke
- C.
  
  Large intestinal fluke
- D.
  
  Oriental lung fluke
Correct Answer
D. Oriental lung fluke

Explanation
The common name of Paragonimus westermani is the Oriental lung fluke.

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3.

Which of the following resembles the egg of Fasciolopsis buski?
- A.
  
  Gastrodiscoides hominis
- B.
  
  Echinochasmus perfoliatus
- C.
  
  Fasciola hepatica
- D.
  
  All of the above
Correct Answer
D. All of the above

Explanation
The correct answer is "All of the above." This means that all three options - Gastrodiscoides hominis, Echinochasmus perfoliatus, and Fasciola hepatica - resemble the egg of Fasciolopsis buski.

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4.

All of the following are possible treatments for trematode infection, except:
- A.
  
  Albendazole + Mebendazole
- B.
  
  Praziquantel
- C.
  
  Niclosamide
- D.
  
  All are possible treatments for trematode infections
Correct Answer
A. Albendazole + Mebendazole

Explanation
Albendazole and Mebendazole are both anthelmintic drugs commonly used to treat infections caused by nematodes, not trematodes. Trematode infections, also known as fluke infections, are typically treated with Praziquantel or Niclosamide. Therefore, Albendazole + Mebendazole is not a possible treatment for trematode infections.

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5.

Intestinal parasites of reptiles, birds, and mammals.
- A.
  
  Philophthalmus
- B.
  
  M. yokogawi
- C.
  
  Phaneropsolus
- D.
  
  Gymnophalloides
Correct Answer
C. pHaneropsolus

Explanation
Phaneropsolus is a possible correct answer because it is a genus of intestinal parasites that can infect reptiles, birds, and mammals. The question is asking for examples of intestinal parasites in these three groups, and Phaneropsolus fits this criteria. It is important to note that without additional context or information, it is difficult to determine the exact reason why Phaneropsolus is the correct answer.

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6.

Which of the following is not a pathology/clinical manifestation of Fasciola gigantica?
- A.
  
  Stomach upset
- B.
  
  Obstruction of biliary ducts
- C.
  
  Hepatomegaly
Correct Answer
A. Stomach upset

Explanation
Fasciola gigantica is a parasite that primarily affects the liver. It causes hepatomegaly, which is an enlargement of the liver, and obstruction of biliary ducts, leading to symptoms such as jaundice. Stomach upset, however, is not a specific pathology or clinical manifestation associated with Fasciola gigantica infection. While gastrointestinal symptoms like nausea and vomiting can occur, stomach upset is a general term that does not specifically relate to the effects of this parasite. Therefore, stomach upset is not a pathology/clinical manifestation of Fasciola gigantica.

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7.

Which trematode has ants (Formica fusca) as its second intermediate host?
- A.
  
  Opistorchis viverrini
- B.
  
  Watsonius watsoni
- C.
  
  Dicrocoelium dendriticum
- D.
  
  Gastrodiscoides hominis
Correct Answer
C. Dicrocoelium dendriticum

Explanation
Dicrocoelium dendriticum is a trematode that has ants (Formica fusca) as its second intermediate host. Trematodes are parasitic flatworms that have complex life cycles involving multiple hosts. In the case of Dicrocoelium dendriticum, the adult worms reside in the bile ducts of herbivores such as sheep and cattle. The eggs are then passed in the feces of the host and are ingested by snails, which serve as the first intermediate host. Inside the snail, the eggs develop into cercariae, which are then released into the environment. These cercariae are ingested by ants while feeding on vegetation, and they migrate to the ant's brain, altering its behavior. The infected ant is then consumed by a herbivore, completing the life cycle of Dicrocoelium dendriticum.

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8.

Its adult morphology resembles a spoon with one end contracted or preserved an oval, flattened coffee bean.
- A.
  
  M. yokogawai
- B.
  
  P. westermani
- C.
  
  S. japonicum
- D.
  
  Fasciola hepatica
Correct Answer
B. P. westermani

Explanation
P. westermani is the correct answer because its adult morphology resembles a spoon with one end contracted or preserved an oval, flattened coffee bean.

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9.

The second intermediate host of Paragonimus westermani are:
- A.
  
  Aquatic plants
- B.
  
  Crustaceans
- C.
  
  Snails
- D.
  
  Ants
Correct Answer
B. Crustaceans

Explanation
The second intermediate host of Paragonimus westermani is crustaceans. This means that Paragonimus westermani requires crustaceans in order to complete its life cycle. Crustaceans are a group of arthropods that include animals such as crabs, lobsters, and shrimp. These crustaceans act as a host for the parasite, allowing it to develop and reproduce. This is an important step in the life cycle of Paragonimus westermani, as it allows the parasite to move from one host to another and continue its life cycle.

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10.

All of the following trematodes have aquatic plants as their second intermediate host, except:
- A.
  
  Opistorchis viverrini
- B.
  
  Fasciola gigantica
- C.
  
  Fasciola hepatica
- D.
  
  Both B and C
Correct Answer
A. Opistorchis viverrini

Explanation
Opistorchis viverrini is the correct answer because it does not have aquatic plants as its second intermediate host. Opistorchis viverrini is a liver fluke that primarily infects humans and other mammals through the consumption of raw or undercooked fish. Its life cycle involves snails as the first intermediate host and fish as the second intermediate host, but it does not rely on aquatic plants for its life cycle. In contrast, both Fasciola gigantica and Fasciola hepatica, which are also liver flukes, require aquatic plants as their second intermediate host.

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11.

Trapa, Eichhornia, Eliocharis, and Zizania are all second intermediate hosts of _____.
- A.
  
  Schistosoma haematobium
- B.
  
  Fasciola hepatica
- C.
  
  Paragonimus westermani
- D.
  
  Fasciolopsis buski
Correct Answer
D. Fasciolopsis buski

Explanation
Trapa, Eichhornia, Eliocharis, and Zizania are all second intermediate hosts of Fasciolopsis buski.

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12.

The adult form of this trematode measures 1.4 by 0.6 mm and has a pyriform shape with rounded posterior and tapering anterior end.
- A.
  
  Heterophyes heterophyes
- B.
  
  Metagonimus yokogawai
- C.
  
  Paragonimus westermani
- D.
  
  Clonorchis sinensis
Correct Answer
B. Metagonimus yokogawai

Explanation
Metagonimus yokogawai is the correct answer because it is a trematode that matches the given description. It is an adult form that measures 1.4 by 0.6 mm and has a pyriform shape with a rounded posterior and tapering anterior end. Heterophyes heterophyes, Paragonimus westermani, and Clonorchis sinensis are other types of trematodes, but they do not match the given description.

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13.

The difference between M. yokogawai from C. sinensis is:
- A.
  
  Eggs of M. yokogawai have less distinct opercular groove
- B.
  
  Eggs of M. yokogawai have more distinct opercular groove
- C.
  
  Eggs are indistinguishable
- D.
  
  None of the above
Correct Answer
A. Eggs of M. yokogawai have less distinct opercular groove

Explanation
The correct answer is "Eggs of M. yokogawai have less distinct opercular groove." This means that when comparing the eggs of M. yokogawai and C. sinensis, the opercular groove on the eggs of M. yokogawai is not as clear or prominent as the opercular groove on the eggs of C. sinensis. This difference can be used to distinguish between the two species.

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14.

Which pair of parasites exhibit a pathogenecity of granulomatous lesions caused by eggs when they enter venules or lymphatics in distant locations such as the heart and the nervous system?
- A.
  
  C. sinensis and H. heterophyes
- B.
  
  P. westermani and F. buski
- C.
  
  E. ilocanum and F. hepatica
- D.
  
  H. heterophyes and M. yokogawai
Correct Answer
D. H. heteropHyes and M. yokogawai

Explanation
H. heterophyes and M. yokogawai are the correct pair of parasites that exhibit a pathogenicity of granulomatous lesions caused by eggs when they enter venules or lymphatics in distant locations such as the heart and the nervous system.

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15.

The echinostomate flukes have no sporocystic stage
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
Echinostomate flukes do not have a sporocystic stage. This means that they do not go through the typical life cycle stage where sporocysts develop within the intermediate host. Instead, they directly infect the definitive host, which is usually a vertebrate. This is different from many other flukes that have a sporocystic stage as part of their life cycle.

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16.

This causes salmon poisoning in dogs
- A.
  
  Euparyphium ilocanum
- B.
  
  Gastrodiscoides hominis
- C.
  
  Nanophyetus (Troglotrema) salmincola
- D.
  
  None of the above
Correct Answer
C. NanopHyetus (Troglotrema) salmincola

Explanation
Nanophyetus (Troglotrema) salmincola causes salmon poisoning in dogs. This parasite is commonly found in raw or undercooked fish, particularly salmon, and can infect dogs when they consume infected fish. The parasite releases a toxin that affects the dog's gastrointestinal tract, leading to symptoms such as diarrhea, vomiting, and dehydration. If left untreated, salmon poisoning can be fatal. Therefore, it is important to ensure that dogs are not fed raw or undercooked fish to prevent infection.

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17.

The egg of this parasite is greenish-brown, 150 to 170 um by 60 to 70 um which is ovoid with an anterior portion narrow and a small operculum.
- A.
  
  E. ilocanum
- B.
  
  G. hominis
- C.
  
  N. salmincola
- D.
  
  H. heterophyes
Correct Answer
B. G. hominis

Explanation
The correct answer is G. hominis. The given description matches the characteristics of the egg of G. hominis, which is greenish-brown, ovoid in shape, and has a narrow anterior portion and a small operculum. The other options do not match these specific characteristics.

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18.

This is a parasite of monkeys and baboons. This fluke has a large, powerful ventral sucker that is the chief cause of trauma of the intestinal mucosa of primates and can cause severe diarrhea and toxic inanition in humans.
- A.
  
  Watsonius watsoni
- B.
  
  Alaria spp.
- C.
  
  Euparyphium ilocanum
- D.
  
  Opistorchis felineus
Correct Answer
A. Watsonius watsoni

Explanation
Watsonius watsoni is the correct answer because it is described as a parasite of monkeys and baboons. It is a fluke that has a large, powerful ventral sucker which causes trauma to the intestinal mucosa of primates, leading to severe diarrhea and toxic inanition in humans. The other options, Alaria spp., Euparyphium ilocanum, and Opistorchis felineus, do not match the given description.

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19.

The adult form of this fluke resembles C. sinensis and measures 7- 12mm by 1.5- 3.0mm
- A.
  
  Watsonius watsoni
- B.
  
  Alaria spp.
- C.
  
  Euparyphium ilocanum
- D.
  
  Opistorchis felineus
Correct Answer
D. Opistorchis felineus

Explanation
Opistorchis felineus is the correct answer because it is the only option that resembles C. sinensis in terms of size. The adult form of Opistorchis felineus measures 7-12mm by 1.5-3.0mm, which matches the given measurements. The other options, Watsonius watsoni, Alaria spp., and Euparyphium ilocanum, do not have the same size characteristics as C. sinensis, making them incorrect choices.

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20.

What are the intermediate hosts of O. felineus
- A.
  
  Cyprinoid fish
- B.
  
  Salmons
- C.
  
  Bulimus snails
- D.
  
  Zebrina (a type of snail)
Correct Answer
C. Bulimus snails

Explanation
Bulimus snails are the intermediate hosts of O. felineus. This means that the parasite O. felineus undergoes part of its life cycle inside these snails. The snails become infected by consuming the eggs or larvae of the parasite. Once inside the snail, the parasite undergoes further development before being able to infect its final host, which is typically a mammal such as a cat or a human. Therefore, the presence of Bulimus snails is crucial for the completion of the life cycle of O. felineus.

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21.

Philophthalmus lacrimosus is a common species of which fluke?
- A.
  
  Eye flukes
- B.
  
  Liver flukes
- C.
  
  Intestinal flukes
- D.
  
  Blood flukes
Correct Answer
A. Eye flukes

Explanation
Philophthalmus lacrimosus is a common species of eye flukes. Eye flukes are parasitic flatworms that infect the eyes of various animals, including humans. They have a complex life cycle that involves multiple hosts, including snails and birds. Eye flukes can cause inflammation, irritation, and damage to the eyes, leading to vision problems and other complications. Philophthalmus lacrimosus specifically infects the eyes of birds, but it can also occasionally infect humans.

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22.

An intestinal fluke which lives at the wall of the small bowel like. It has been reported in Mindanao in the Philippines, and Thailand.
- A.
  
  Phaneropsolus
- B.
  
  Haplorchis taichui
- C.
  
  Gymnophalloides
- D.
  
  Acanthoparyphium
Correct Answer
B. Haplorchis taichui

Explanation
Haplorchis taichui is the correct answer because it is an intestinal fluke that is known to inhabit the wall of the small bowel. It has been reported in Mindanao in the Philippines and Thailand. The other options, Phaneropsolus, Gymnophalloides, and Acanthoparyphium, are not specifically associated with living in the small bowel, making them incorrect choices.

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23.

Originally described as as echinomastid intestinal parasite of ducks in Korea
- A.
  
  Phaneropsolus
- B.
  
  Haplorchis taichui
- C.
  
  Gymnophalloides
- D.
  
  Acanthoparyphium
Correct Answer
D. AcanthoparypHium

Explanation
The given answer, Acanthoparyphium, is the correct one because it is the only option that fits the description provided in the question. The question states that the parasite was originally described as an echinomastid intestinal parasite of ducks in Korea, and Acanthoparyphium is the only option that matches this description. The other options, Phaneropsolus, Haplorchis taichui, and Gymnophalloides, do not fit the given information.

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24.

Was first discovered in the stool of patients complaining of epigastric pain , diarrhes from a small island village off the southwest coast of Korea. They infect marin bivalves and raw oysters.
- A.
  
  Acanthoparyphium
- B.
  
  Phaneropsolus
- C.
  
  Haplorchis taichui
- D.
  
  Gymnophalloides
Correct Answer
D. GymnopHalloides

Explanation
Gymnophalloides is the correct answer because it was first discovered in the stool of patients who had epigastric pain and diarrhea in a small island village off the southwest coast of Korea. This parasite infects marine bivalves and raw oysters.

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25.

The infective stage of schistosomes is:
- A.
  
  Metacercaria
- B.
  
  Fork-tailed cercaria
- C.
  
  Sporocyst
- D.
  
  Egg
Correct Answer
B. Fork-tailed cercaria

Explanation
The infective stage of schistosomes is the fork-tailed cercaria. Schistosomes are parasitic flatworms that cause schistosomiasis in humans. The fork-tailed cercaria is the final larval stage of the schistosome life cycle, and it is released from freshwater snails into the water. It has a forked tail that helps it swim and penetrate the skin of humans who come into contact with contaminated water. Once inside the human body, the fork-tailed cercaria transforms into an adult worm and starts reproducing, leading to the development of schistosomiasis.

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26.

Biomphalaria (Australorbis) and Tropicorbis are intermediate hosts of which fluke?
- A.
  
  S. japonicum
- B.
  
  S. mansoni
- C.
  
  F. buski
- D.
  
  F. hepatica
Correct Answer
B. S. mansoni

Explanation
Biomphalaria (Australorbis) and Tropicorbis are known to be intermediate hosts of the fluke called S. mansoni. This means that these two species of snails play a crucial role in the life cycle of S. mansoni, facilitating its development and transmission. S. mansoni is a type of fluke that causes schistosomiasis, a parasitic disease that affects millions of people worldwide.

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27.

What species of schistosomes have the longest maturation period?
- A.
  
  S. haematobium
- B.
  
  S. japonicum
- C.
  
  S. mansoni
- D.
  
  NOTA
Correct Answer
A. S. haematobium

Explanation
S. haematobium is the correct answer because it is known to have the longest maturation period compared to the other species mentioned (S. japonicum and S. mansoni). This means that it takes a longer time for S. haematobium to reach maturity and reproduce compared to the other species.

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28.

Within a few hours the parasite (schistosomes) becomes a _______ (inside the body)and undergoes morphologic and biochemical alterations of its membrane, and soon covers itself with host antigens that help it evade immune attack
- A.
  
  Forked-tail cercaria
- B.
  
  Metacercaria
- C.
  
  Schistomula
- D.
  
  L3 Larva
Correct Answer
C. Schistomula

Explanation
After entering the body, the parasite undergoes morphologic and biochemical alterations of its membrane and covers itself with host antigens to evade immune attack. The correct answer, schistomula, refers to the stage of the parasite's life cycle where it has transformed from a cercaria (a free-swimming larval form) into a schistosomula (a stage where it has developed a protective covering and is ready to establish itself in the host's tissues).

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29.

The first intermediate host of trematodes are:
- A.
  
  Crustaceans
- B.
  
  Snails
- C.
  
  Arthropods
- D.
  
  Aquatic plants
Correct Answer
B. Snails

Explanation
Snails are the correct answer because they serve as the first intermediate host for trematodes. Trematodes are parasitic flatworms that have complex life cycles involving multiple hosts. Snails play a crucial role in the life cycle of trematodes by serving as the primary host where the parasite undergoes asexual reproduction and development. The trematode larvae then leave the snail and infect the next host in the life cycle. Therefore, snails are an essential part of the transmission and survival of trematodes.

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30.

A dry cough, bloodstained, rusty brown tenacious sputum most pronounced on rising in the morning and pulmonary pain, pleurisy and hemoptysis may occur as a pathology of this trematode.
- A.
  
  H. heterophyes
- B.
  
  S. haematobium
- C.
  
  C. sinensis
- D.
  
  P. westermani
Correct Answer
D. P. westermani

Explanation
P. westermani is a trematode parasite that causes a disease called paragonimiasis. The symptoms mentioned in the question, such as dry cough, bloodstained sputum, and pulmonary pain, are characteristic of paragonimiasis. This parasite primarily affects the lungs and can cause pleurisy and hemoptysis (coughing up blood). Therefore, P. westermani is the most likely cause of the mentioned pathology.

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31.

Pulmonary distomiasis is caused by:
- A.
  
  H. heterophyes
- B.
  
  S. haematobium
- C.
  
  C. sinensis
- D.
  
  P. westermani
Correct Answer
D. P. westermani

Explanation
Pulmonary distomiasis is caused by P. westermani, which is a type of parasitic worm known as a lung fluke. This parasite infects the lungs and can cause symptoms such as coughing, chest pain, and difficulty breathing. P. westermani is commonly found in East Asia, particularly in areas where raw or undercooked freshwater crustaceans are consumed. Ingesting these infected crustaceans can lead to the development of pulmonary distomiasis. Other options listed, such as H. heterophyes, S. haematobium, and C. sinensis, are not known to cause pulmonary distomiasis.

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32.

In the brain, P. westermani infection may cause:
- A.
  
  Hemiplegia
- B.
  
  Jacksonian epilepsy
- C.
  
  Visual disturbances
- D.
  
  AOTA
Correct Answer
D. AOTA

Explanation
P. westermani infection in the brain can lead to various symptoms, including hemiplegia (paralysis on one side of the body), Jacksonian epilepsy (a type of epilepsy characterized by muscle spasms starting in one area and spreading to others), and visual disturbances. Therefore, the correct answer is "All of the above (AOTA)".

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33.

It is a pathogenesis in which the enlarged liver becomes firm and shrinks in total size, but the left lobe under the xiphoid process still remains prominent.
- A.
  
  Portal hypertension
- B.
  
  Hepatosplenic schistosomiasis
- C.
  
  Katayama fever
- D.
  
  Chronic typhoid fever
Correct Answer
B. Hepatosplenic schistosomiasis

Explanation
Hepatosplenic schistosomiasis is a parasitic infection caused by Schistosoma mansoni, Schistosoma japonicum, or Schistosoma mekongi. This infection leads to chronic inflammation and fibrosis of the liver and spleen. As a result, the liver becomes enlarged initially but later shrinks in size due to fibrosis. However, the left lobe under the xiphoid process remains prominent due to the presence of portal hypertension, which is a common complication of hepatosplenic schistosomiasis.

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34.

An acute systemic illness characterized by chills, fever, weakness, weight loss, cough, arthralgias, marked eosinophilia and often culminating in abdominal pain and bloody diarrhea.
- A.
  
  Portal hypertension
- B.
  
  Hepatosplenic schistosomiasis
- C.
  
  Katayama fever
- D.
  
  Chronic typhoid fever
Correct Answer
C. Katayama fever

Explanation
Katayama fever is the correct answer because it fits the description of an acute systemic illness characterized by various symptoms such as chills, fever, weakness, weight loss, cough, arthralgias, marked eosinophilia, and abdominal pain. This condition is commonly associated with schistosomiasis, a parasitic infection caused by Schistosoma parasites. Katayama fever typically occurs during the early stage of schistosomiasis infection, when the body is reacting to the presence of the parasites.

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35.

Oriental schistosomiasis
- A.
  
  S. japonicum
- B.
  
  S. mansoni
- C.
  
  S. haematobium
- D.
  
  NOTA
Correct Answer
A. S. japonicum

Explanation
The correct answer is S. japonicum. Oriental schistosomiasis is caused by Schistosoma japonicum, which is a parasitic worm. It is one of the three main species of Schistosoma that cause schistosomiasis in humans, the other two being S. mansoni and S. haematobium. S. japonicum is primarily found in East Asia, particularly in China, the Philippines, and Indonesia. It is transmitted through contact with contaminated freshwater where the intermediate host snail is present. The infection can cause various symptoms, including fever, abdominal pain, diarrhea, and liver and spleen enlargement.

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36.

Urinary bilharziasis
- A.
  
  S. japonicum
- B.
  
  S. mansoni
- C.
  
  S. haematobium
- D.
  
  NOTA
Correct Answer
C. S. haematobium

Explanation
S. haematobium is the correct answer because it is the specific species of Schistosoma that causes urinary bilharziasis. S. japonicum and S. mansoni are other species of Schistosoma that cause different types of schistosomiasis, not specifically urinary bilharziasis. NOTA stands for "None of the above" and is not a valid answer in this case.

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37.

Vesical schistosomiasis
- A.
  
  S. japonicum
- B.
  
  S. mansoni
- C.
  
  S. haematobium
- D.
  
  NOTA
Correct Answer
C. S. haematobium

Explanation
The correct answer is S. haematobium. Vesical schistosomiasis is a disease caused by the parasitic infection of Schistosoma haematobium. This particular species of Schistosoma is known to primarily affect the urinary system, specifically the bladder and ureters. It is transmitted through contact with contaminated freshwater, where the parasite's larvae (cercariae) are released by infected snails. Once inside the body, the larvae develop into adult worms that lay eggs in the blood vessels surrounding the bladder. The eggs are then passed out through urine, leading to various urinary symptoms and potentially causing long-term complications such as bladder cancer.

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38.

Intestinal bilharziasis
- A.
  
  S. japonicum
- B.
  
  S. mansoni
- C.
  
  S. haematobium
- D.
  
  NOTA
Correct Answer
B. S. mansoni

Explanation
The correct answer is S. mansoni. This is because S. mansoni is one of the three main species of Schistosoma that cause intestinal bilharziasis, also known as schistosomiasis. The other two species are S. japonicum and S. haematobium. Therefore, S. mansoni is the most appropriate answer in this context.

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39.

Bulimus, Physopsis, and Biomphalaria are all intermediate hosts of which trematode?
- A.
  
  C. sinensis
- B.
  
  S. haematobium
- C.
  
  P. westermani
- D.
  
  F. heptaica
Correct Answer
B. S. haematobium

Explanation
Bulimus, Physopsis, and Biomphalaria are all intermediate hosts of Schistosoma haematobium. Schistosoma haematobium is a trematode parasite that causes schistosomiasis, a disease commonly found in Africa and the Middle East. These intermediate hosts play a crucial role in the life cycle of the parasite by allowing it to develop and reproduce before infecting humans.

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40.

The egg of this trematode can be recovered from urine.
- A.
  
  S. haematobium
- B.
  
  C. sinensis
- C.
  
  S. japonicum
- D.
  
  Acanthoparyphium
Correct Answer
A. S. haematobium

Explanation
S. haematobium is the correct answer because it is a trematode that infects the urinary system, specifically the urinary bladder and ureters. The eggs of S. haematobium are excreted in the urine of infected individuals. This is a characteristic feature of S. haematobium infection and distinguishes it from the other options listed.

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41.

Acute schistosomiasis
- A.
  
  S. japonicum
- B.
  
  S. mansoni
- C.
  
  S. haematobium
- D.
  
  NOTA
Correct Answer
A. S. japonicum

Explanation
The correct answer is S. japonicum. This is because acute schistosomiasis is caused by infection with Schistosoma japonicum, which is one of the three main species of schistosomes that cause the disease. The other two species are S. mansoni and S. haematobium. The presence of NOTA indicates that none of the above options are correct, so the correct answer is S. japonicum.

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42.

Chronic typhoid fever
- A.
  
  S. japonicum and S. mansoni
- B.
  
  S. mansoni and S. haematobium
- C.
  
  S. haematobium and S. japonicum
- D.
  
  NOTA
Correct Answer
A. S. japonicum and S. mansoni

Explanation
The correct answer is S. japonicum and S. mansoni. Chronic typhoid fever is a condition caused by the bacteria Salmonella typhi. However, the given options do not mention any bacteria related to typhoid fever. Instead, they mention different species of Schistosoma, which are parasitic worms that cause schistosomiasis. Therefore, the given question is incomplete and does not provide enough information to determine a correct answer.

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43.

The intermediate host of the oriental blood fluke is:
- A.
  
  Australorbis
- B.
  
  Oncomelania
- C.
  
  Pomacea
- D.
  
  Lymancea truncatula
Correct Answer
B. Oncomelania

Explanation
Oncomelania is the correct answer because it is the intermediate host of the oriental blood fluke. The oriental blood fluke is a parasitic flatworm that requires an intermediate host to complete its life cycle. Oncomelania is a type of freshwater snail that serves as the intermediate host for the oriental blood fluke. The fluke's eggs are released into the water through the snail's feces, and once they hatch, they infect other organisms such as fish or humans. Therefore, Oncomelania plays a crucial role in the transmission of the oriental blood fluke.

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44.

Colonic polyposis resulting in congestive splenomegaly and esophageal varices
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

Explanation
Colonic polyposis in people with hepatosplenic schistosomiasis

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45.

Periportal fibrosis or Symmer's fibrosis is a complication infection due to adherence of bacteria to the worm.
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

Explanation
Symmer's fibrosis resulting in congestive splenomegaly and esophageal varices

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46.

Which stage of trematodes is observed in diagnosing schistosomes?
- A.
  
  Adult
- B.
  
  Cercaria (fork-tailed)
- C.
  
  Metacercaria
- D.
  
  Egg
Correct Answer
D. Egg

Explanation
In diagnosing schistosomes, the stage of trematodes that is observed is the egg stage. This is because the eggs of schistosomes can be found in the urine or feces of infected individuals, and their presence is used as an indicator of infection. The eggs are usually oval-shaped and have a characteristic appearance under a microscope, allowing for accurate diagnosis of schistosomiasis.

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47.

Which patient is less likely to respond to treatment and recover slowly?
- A.
  
  A patient infected with the oriental blood fluke
- B.
  
  A patient infected with S. haematobium
- C.
  
  A patient infected with S. japonicum
- D.
  
  Both A and C
Correct Answer
D. Both A and C

Explanation
S. japonicum has always been the least responsive to treatment as compared to S. mansoni and S. haematobium.

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48.

What is the preferred technique in diagnosing schistosomes?
- A.
  
  Serologic tests
- B.
  
  Demonstration of characteristic eggs (in stool)
- C.
  
  Liver biopsies
- D.
  
  Barium swallow
Correct Answer
B. Demonstration of characteristic eggs (in stool)

Explanation
The preferred technique in diagnosing schistosomes is the demonstration of characteristic eggs in stool. This method involves examining a stool sample under a microscope to identify the presence of schistosome eggs, which are a definitive sign of infection. Serologic tests can also be used to detect antibodies against schistosomes, but they may not always be reliable. Liver biopsies and barium swallow are not commonly used for diagnosing schistosomes.

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49.

All of the following may be used in diagnosing schistosomes, except:
- A.
  
  Barium swallow
- B.
  
  X-rays
- C.
  
  Liver ultrasound
- D.
  
  NOTA
Correct Answer
D. NOTA

Explanation
Schistosomes are parasitic worms that infect humans and can cause schistosomiasis, a disease that affects the urinary and intestinal systems. To diagnose schistosomes, various methods can be used such as stool examination, urine examination, and serological tests. However, a barium swallow, X-rays, and liver ultrasound are not typically used in diagnosing schistosomes as they are not effective in detecting or confirming the presence of the parasite. NOTA (None of the above) is the correct answer as it is the only option that is not relevant to the diagnosis of schistosomes.

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50.

Tricula aperta is the first intermediate host of which schistosome?
- A.
  
  S. japonicum
- B.
  
  S. malayensis
- C.
  
  S. mekongi
- D.
  
  S. intercalatum
Correct Answer
C. S. mekongi

Explanation
Tricula aperta is the first intermediate host of Schistosoma mekongi. This means that the parasite's larvae, known as cercariae, penetrate and develop within Tricula aperta snails. Once matured, the cercariae are released into the water, where they can infect humans and other mammals. Therefore, Tricula aperta plays a crucial role in the life cycle of S. mekongi, serving as a vector for the transmission of the parasite.

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Current Version
May 12, 2023

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Apr 25, 2022

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Pathogenic Parasites Quiz Questions And Answers

Metagonimus yokogawai differs from Heterophyes heterophyes by:

The common name of Paragonimus westermani is:

Which of the following resembles the egg of Fasciolopsis buski?

All of the following are possible treatments for trematode infection, except:

Intestinal parasites of reptiles, birds, and mammals.

Which of the following is not a pathology/clinical manifestation of Fasciola gigantica?

Which trematode has ants (Formica fusca) as its second intermediate host?

Its adult morphology resembles a spoon with one end contracted or preserved an oval, flattened coffee bean.

The second intermediate host of Paragonimus westermani are:

All of the following trematodes have aquatic plants as their second intermediate host, except:

Trapa, Eichhornia, Eliocharis, and Zizania are all second intermediate hosts of _____.

The adult form of this trematode measures 1.4 by 0.6 mm and has a pyriform shape with rounded posterior and tapering anterior end.

The difference between M. yokogawai from C. sinensis is:

Which pair of parasites exhibit a pathogenecity of granulomatous lesions caused by eggs when they enter venules or lymphatics in distant locations such as the heart and the nervous system?

The echinostomate flukes have no sporocystic stage

This causes salmon poisoning in dogs

The egg of this parasite is greenish-brown, 150 to 170 um by 60 to 70 um which is ovoid with an anterior portion narrow and a small operculum.

This is a parasite of monkeys and baboons. This fluke has a large, powerful ventral sucker that is the chief cause of trauma of the intestinal mucosa of primates and can cause severe diarrhea and toxic inanition in humans.

The adult form of this fluke resembles C. sinensis and measures 7- 12mm by 1.5- 3.0mm

What are the intermediate hosts of O. felineus

Philophthalmus lacrimosus is a common species of which fluke?

An intestinal fluke which lives at the wall of the small bowel like. It has been reported in Mindanao in the Philippines, and Thailand.

Originally described as as echinomastid intestinal parasite of ducks in Korea

Was first discovered in the stool of patients complaining of epigastric pain , diarrhes from a small island village off the southwest coast of Korea. They infect marin bivalves and raw oysters.

The infective stage of schistosomes is:

Biomphalaria (Australorbis) and Tropicorbis are intermediate hosts of which fluke?

What species of schistosomes have the longest maturation period?

Within a few hours the parasite (schistosomes) becomes a _______ (inside the body)and undergoes morphologic and biochemical alterations of its membrane, and soon covers itself with host antigens that help it evade immune attack

The first intermediate host of trematodes are:

A dry cough, bloodstained, rusty brown tenacious sputum most pronounced on rising in the morning and pulmonary pain, pleurisy and hemoptysis may occur as a pathology of this trematode.

Pulmonary distomiasis is caused by:

In the brain, P. westermani infection may cause:

It is a pathogenesis in which the enlarged liver becomes firm and shrinks in total size, but the left lobe under the xiphoid process still remains prominent.

An acute systemic illness characterized by chills, fever, weakness, weight loss, cough, arthralgias, marked eosinophilia and often culminating in abdominal pain and bloody diarrhea.

Oriental schistosomiasis

Urinary bilharziasis

Vesical schistosomiasis

Intestinal bilharziasis

Bulimus, Physopsis, and Biomphalaria are all intermediate hosts of which trematode?

The egg of this trematode can be recovered from urine.

Acute schistosomiasis

Chronic typhoid fever

The intermediate host of the oriental blood fluke is:

Colonic polyposis resulting in congestive splenomegaly and esophageal varices

Periportal fibrosis or Symmer's fibrosis is a complication infection due to adherence of bacteria to the worm.

Which stage of trematodes is observed in diagnosing schistosomes?

Which patient is less likely to respond to treatment and recover slowly?

What is the preferred technique in diagnosing schistosomes?

All of the following may be used in diagnosing schistosomes, except:

Tricula aperta is the first intermediate host of which schistosome?