Dr. Man Sokchea (Parasitology)

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  • 1/75 Questions

    Self-infection occurs by transferring infective eggs to the mouth with hands that have scratched the perianal area.

    • Ancylostoma duodenale
    • Trichinella speies
    • Capillaria species
    • E. vermicularis
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Dr. Man Sokchea (Parasitology) - Quiz

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  • 2. 

    Gravid females migrate nocturnally outside the anus and oviposit while crawling on the skin of the perianal area.

    • Ancyclostoma duodenale

    • Trichinella species

    • Capillaria species

    • E. vermicularis

    Correct Answer
    A. E. vermicularis
    Explanation
    This answer is correct because E. vermicularis, also known as pinworm, is a parasitic worm that commonly infects humans. The given statement describes the behavior of gravid females, which refers to pregnant female worms, migrating outside the anus and laying eggs while crawling on the skin around the anus. This behavior is characteristic of E. vermicularis. The other options, Ancyclostoma duodenale, Trichinella species, and Capillaria species, do not exhibit this specific behavior.

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  • 3. 

    Method of choice for recovery in "Pinworm Paddle" or a properly prepared scotch tape preparation.

    • Ancylostoma duodenale

    • Trichinella species

    • Capillaria species

    • E. vermicularis

    Correct Answer
    A. E. vermicularis
    Explanation
    The correct answer is E. vermicularis. "Pinworm Paddle" or a properly prepared scotch tape preparation is a method used for the recovery of E. vermicularis. This method involves pressing a transparent adhesive tape against the perianal area, which allows the collection of pinworm eggs or adult worms for microscopic examination. Ancylostoma duodenale, Trichinella species, and Capillaria species are not typically recovered using this method.

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  • 4. 

    The disease is often asymptomatic but can sometimes manifest classically as nocturnal anal pruritus especially in children. 

    • Ancylostoma duodenale

    • Trichinella species

    • Capillaria species 

    • Enterobius vermicularis

    Correct Answer
    A. Enterobius vermicularis
    Explanation
    Enterobius vermicularis is a parasitic worm that causes the condition known as pinworm infection. This infection is often asymptomatic, meaning that it does not cause any noticeable symptoms. However, in some cases, especially in children, it can cause nocturnal anal pruritus, which is itching around the anus at night. This symptom is considered a classic manifestation of Enterobius vermicularis infection. The other options listed, Ancylostoma duodenale, Trichinella species, and Capillaria species, do not typically cause this specific symptom.

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  • 5. 

    Gravid females migrate nocturnally outside the anus and oviposit while crawling on the skin of the perianal area.

    • Ancylostoma duodenale

    • Trichinella species

    • Capillaria species

    • E. vermicularis

    Correct Answer
    A. E. vermicularis
    Explanation
    The given statement describes the behavior of gravid females, which means pregnant females, migrating outside the anus and laying eggs while crawling on the skin around the anus. This behavior is characteristic of E. vermicularis, also known as pinworm. Ancylostoma duodenale, Trichinella species, and Capillaria species do not exhibit this specific behavior, making E. vermicularis the correct answer.

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  • 6. 

    People who are infected with pinworm can transfer the parasite to others for as long as there is a female pinworm depositing eggs on the perianal skin.

    • Ancylostoma duodenale

    • Trichinella species

    • Capillaria species

    • E. vermicularis

    Correct Answer
    A. E. vermicularis
    Explanation
    E. vermicularis, also known as pinworm, is the correct answer because the statement in the question specifically mentions that people infected with pinworm can transfer the parasite to others as long as there is a female pinworm depositing eggs on the perianal skin. This aligns with the characteristics and behavior of E. vermicularis, making it the correct answer choice.

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  • 7. 

    Self-infection occurs by transferring infective eggs to mouth with hands that have scratched the perianal area.

    • Ancylostoma duodenale

    • Trichinella species

    • Capillaria species

    • E. vermicularis

    Correct Answer
    A. E. vermicularis
    Explanation
    E. vermicularis, also known as pinworm, is a common intestinal parasite that can cause self-infection. The female pinworm lays eggs in the perianal area, causing itching. When a person scratches the area, the eggs can be transferred to their hands. If the person then touches their mouth or food without washing their hands, they can ingest the eggs, leading to self-infection. This cycle of transmission is common in households and institutions, especially among children.

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  • 8. 

    These eggs are deposited around the anus by the worm and can be carried to common surfaces such as hands, toys, bedding, clothing, and toilet seats.

    • Ancyclostoma duodenalis

    • Trichinella species

    • Capillaria species

    • E. vermicularis

    Correct Answer
    A. E. vermicularis
  • 9. 

    Trichuris species have a direct life cycle, and mature in a single host. The host becomes infected when it:

    • Penetrates thru the skin.

    • Ingests embryonated eggs from the environment.

    • Inhales the sporocyst.

    • Breasts the baby.

    Correct Answer
    A. Ingests embryonated eggs from the environment.
    Explanation
    Trichuris species have a direct life cycle, meaning they do not require intermediate hosts to complete their life cycle. The correct answer is that the host becomes infected when it ingests embryonated eggs from the environment. This means that the eggs of Trichuris species are passed in the feces of an infected individual and can contaminate the environment. If another host ingests these eggs, they can hatch and develop into adult worms within the intestines of the new host, causing infection.

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  • 10. 

    A person infected with parasitic infection is often asymptomatic, but itching around the anus is a common symptom of:

    • Ancylostoma duodenale

    • Trichinella species

    • Capillaria species

    • E. vermicularis

    Correct Answer
    A. E. vermicularis
    Explanation
    E. vermicularis is the correct answer because it is commonly known as pinworm and it is the most common parasitic infection in humans. Although many infected individuals do not show symptoms, itching around the anus is a common symptom of pinworm infection. Ancylostoma duodenale is a hookworm that typically causes symptoms such as anemia and abdominal pain. Trichinella species are responsible for trichinellosis, which causes muscle pain and swelling. Capillaria species can cause infections in various parts of the body, but itching around the anus is not a common symptom.

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  • 11. 

    It is either a protozoa or helminth that lives on or in a host and gets its food from or at the expense pf its host.

    • Parasite

    • Vector

    • Agent

    • Arthropod

    Correct Answer
    A. Parasite
    Explanation
    A parasite is an organism that lives on or in a host and obtains its nutrients from the host, often at the host's expense. This can include protozoa or helminths, which are types of parasites. The other options, vector, agent, and arthropod, do not specifically refer to organisms that obtain their food from or at the expense of a host.

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  • 12. 

    Enterobius vermicularis or pinworm is one of the most common parasites in humans affecting mainly children. The stage can be identified for diagnosis in:

    • Eggs

    • Cysts

    • Trophozoites

    • Sporozoites

    Correct Answer
    A. Eggs
    Explanation
    The correct answer is "Eggs". Enterobius vermicularis or pinworm can be diagnosed by identifying its eggs. This parasite is commonly found in humans, especially in children. By examining the eggs under a microscope, it is possible to confirm the presence of pinworm infection. Other stages mentioned in the options, such as cysts, trophozoites, and sporozoites, are not relevant to the diagnosis of Enterobius vermicularis.

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  • 13. 

    Enterobius vermicularis or pinworms is one of the most common parasite in humans affecting mainly children, depositing their eggs:

    • In the liver parenchyma.

    • In the alveolar space.

    • On perianal folds.

    • In the lumen of the intestine.

    Correct Answer
    A. On perianal folds.
    Explanation
    Pinworms, also known as Enterobius vermicularis, are a common parasite that primarily affects children. They deposit their eggs on perianal folds, which are the skin folds around the anus. This is because the adult female pinworms migrate to the perianal area at night to lay their eggs. The eggs can then be easily transferred to the surrounding environment, leading to further infection. Therefore, the correct answer is "On perianal folds."

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  • 14. 

    The eggs are generally flat on one side and rounded on the other.

    • Ancylostoma duodenale

    • Trichinella species

    • Capillaria species

    • E. vermicularis

    Correct Answer
    A. E. vermicularis
    Explanation
    E. vermicularis, also known as pinworm, is the correct answer because it is the only parasite listed that matches the description given in the question. Pinworm eggs are typically flat on one side and rounded on the other, which is a characteristic feature of this particular parasite. Ancylostoma duodenale, Trichinella species, and Capillaria species do not exhibit this specific egg shape.

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  • 15. 

    Once mature, the adult female pinworm migrates to the colon and lays eggs when many of their hosts are asleep.

    • In the feces

    • In the liver

    • In the intestine

    • Around the anus at night

    Correct Answer
    A. Around the anus at night
    Explanation
    The adult female pinworm migrates to the area around the anus at night to lay eggs. This behavior is typical for pinworms, as they have a nocturnal activity pattern. By laying eggs around the anus, the pinworm ensures that the eggs are in close proximity to their next host, as the eggs can easily be transferred to the fingers or undergarments of the host during scratching or movement while sleeping. This facilitates the transmission of pinworm infection to others.

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  • 16. 

    The most typical symptom is perianal pruritus, especially at night, which may lead to excoriations and bacterial superinfection. Occasionally, invasion of the female genital tract with vulvovaginitis and pelvic or peritoneal granuloma can occur.

    • Enterobius vermicularis

    • Ancylostoma duodenale

    • Strongyloides stercoralis

    • Trichinella species

    Correct Answer
    A. Enterobius vermicularis
    Explanation
    Enterobius vermicularis, also known as pinworm, is a parasitic worm that commonly infects humans. The most typical symptom of Enterobius vermicularis infection is perianal pruritus, which refers to itching around the anus, especially at night. This itching can be so severe that it leads to excoriations (skin abrasions) and bacterial superinfection. In some cases, the female genital tract can also be affected, leading to vulvovaginitis. Additionally, invasion of the pelvic or peritoneal area can result in the formation of granulomas.

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  • 17. 

    The parasite Entamoeba histolytica, the infective stage comes out along with the fecal matter and can remain alive for about 10 days. This stage reaches new human host thru contaminated food and water.

    • 1 nucleus

    • 2 nuclei

    • 4 nuclei

    • Not yet nucleus

    Correct Answer
    A. 4 nuclei
    Explanation
    The correct answer is 4 nuclei. Entamoeba histolytica is a parasite that causes amoebic dysentery. It has a unique life cycle that involves different stages, including the infective stage. This infective stage, known as the cyst, is passed out of the human host through fecal matter. The cyst can remain alive for about 10 days outside the host. When the cyst is ingested by a new human host through contaminated food or water, it undergoes a process called excystation. During excystation, the cyst breaks open and releases four nuclei, which eventually develop into new amoebic organisms.

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  • 18. 

    Capillaria philippinensis is a parasitic disease in humans caused by eating:

    • Raw or undercooked fish

    • Raw or undercooked pork

    • Raw or undercooked beef

    • Raw or undercooked vegetable

    Correct Answer
    A. Raw or undercooked fish
    Explanation
    Capillaria philippinensis is a parasitic disease in humans that is caused by consuming raw or undercooked fish. This parasite is commonly found in the intestines of infected fish, and when humans consume these infected fish, the parasite can enter their digestive system and cause infection. Therefore, it is important to ensure that fish is properly cooked before consumption to prevent the transmission of this parasitic disease.

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  • 19. 

    The infective stage of ancylostoma duodenale is:

    • Egg

    • Cyst

    • Sporocyst

    • Filarform larvae

    Correct Answer
    A. Filarform larvae
    Explanation
    The correct answer is filarform larvae. Ancylostoma duodenale is a parasitic worm that causes hookworm infection in humans. The infective stage of this worm is the filarform larvae, which are tiny, elongated, and have a hook-like mouthpart. These larvae are found in contaminated soil and can penetrate the skin of humans, leading to infection. Once inside the body, the larvae migrate to the small intestine and develop into adult worms, causing symptoms such as abdominal pain, anemia, and diarrhea.

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  • 20. 

    In households where more than one member is infected or where repeated, symptomatic infections occur, it is recommended that all household members be treated at the same time.

    • Ancylostoma duodenale

    • Trichinella species

    • Capillaria species

    • E. vermicularis

    Correct Answer
    A. E. vermicularis
    Explanation
    In households where more than one member is infected or where repeated, symptomatic infections occur, it is recommended that all household members be treated at the same time. This is because E. vermicularis, also known as pinworm, is highly contagious and can easily spread from person to person within a household. Treating all household members simultaneously helps to prevent reinfection and the spread of the parasite to others.

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  • 21. 

    The eggs of parasite, elongate-oval and slightly flattened on one side, are usually partially-embryonated when shed; the infection can be diagnosed by applying cellulose tape to the anus of a suspect patient, especially in the morning before the patient's first bowel movement.

    • Ancylostoma duodenale

    • Strongyloides stercoralis

    • Enterobius vermicularis

    • Trichinella species

    Correct Answer
    A. Enterobius vermicularis
    Explanation
    Enterobius vermicularis, also known as pinworm, is a common intestinal parasite that primarily affects children. The eggs of Enterobius vermicularis are elongate-oval and slightly flattened on one side. They are usually partially-embryonated when shed, which means that they are in an early stage of development. One way to diagnose an Enterobius vermicularis infection is by applying cellulose tape to the anus of a suspect patient, especially in the morning before their first bowel movement. The tape can collect any eggs that may be present around the anus, which can then be examined under a microscope for confirmation of the infection.

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  • 22. 

    Trichinella spiralis: The larvae in turn, are transported by the blood stream to all parts of the body. The worm grows:

    • In the parenchymal cells of the liver

    • In the ling parenchyma

    • Within the muscle tissue

    • In the intestinal wall

    Correct Answer
    A. Within the muscle tissue
    Explanation
    Trichinella spiralis larvae are transported by the bloodstream to all parts of the body, including the muscle tissue. Once in the muscle tissue, the worm grows and develops. This is an important stage in the life cycle of Trichinella spiralis, as it allows the worm to establish itself in the host and continue its life cycle. The growth of the worm within the muscle tissue can lead to symptoms such as muscle pain and weakness in infected individuals.

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  • 23. 

    Trichinosis is an infestation with larvae of the worm Trichinella spiralis, contracted from eating the inadequate cooking of:

    • Pork products

    • Fish products

    • Beef products

    • Fresh vegetable

    Correct Answer
    A. Pork products
    Explanation
    Trichinosis is caused by ingesting the larvae of the worm Trichinella spiralis. These larvae are commonly found in undercooked pork products. When pork is not cooked thoroughly, the larvae can survive and cause an infestation when consumed. Therefore, the correct answer is pork products.

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  • 24. 

    Adult stages inhabit the small intestine, where the females produce larve that migrate thru the lymphatics and bloodstream into skeletal musculature, penetrate into muscle cells and encyst.

    • Ancylostoma duodenale

    • Strongyloides stercoralis

    • Trichinella species

    • Capillaria species

    Correct Answer
    A. Trichinella species
    Explanation
    Trichinella species is the correct answer because this parasite is known to infect humans and cause trichinellosis. The adult stages of Trichinella inhabit the small intestine, where the females produce larvae. These larvae then migrate through the lymphatics and bloodstream into skeletal musculature. Once in the muscle cells, they penetrate and encyst, forming cysts. This lifecycle is characteristic of Trichinella species, making it the correct answer.

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  • 25. 

    S. stercoralis: True disseminated infection occurs when parasitic stage penetrates tissue and resides in organs atypical of their normal life cycle.

    • Eggs

    • Trophozoites

    • Filariform larvae

    • Rhabditiform larvae

    Correct Answer
    A. Filariform larvae
    Explanation
    Filariform larvae are the infective stage of S. stercoralis, a parasitic worm. True disseminated infection occurs when these larvae penetrate tissues and reside in organs that are not typical of their normal life cycle. This means that the larvae can migrate to and infect organs such as the liver, lungs, heart, and central nervous system, causing a widespread infection throughout the body.

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  • 26. 

    C. henpatica: these parasites could be accidentally transmitted to humans by: ingesting of embryonated eggs.

    • Ingestion of eggs in fecal-contaminated food

    • Ingestion of cysts in the muscle of fish

    • Ingestion of sporocysts in the muscle of fish

    • Penetration of larvae thru the skin

    Correct Answer
    A. Ingestion of eggs in fecal-contaminated food
    Explanation
    The correct answer states that C. henpatica parasites can be accidentally transmitted to humans by ingesting eggs in fecal-contaminated food. This means that if the food is contaminated with feces that contain the eggs of the parasites, and a person consumes this contaminated food, they can become infected with the parasites.

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  • 27. 

    S. stercoralis: In the current case, only parasitic stage which is unable to penetrate tissue was observed in the biliary fluid, indicative of migration of stage from the intestines to connected organs.

    • Eggs

    • Trophozoites

    • Filariform larvae

    • Rhabditiform larvae

    Correct Answer
    A. Rhabditiform larvae
    Explanation
    The correct answer is "Rhabditiform larvae." In the given explanation, it is mentioned that only the parasitic stage that is unable to penetrate tissue was observed in the biliary fluid. This indicates that the larvae observed in the fluid were Rhabditiform larvae, as they are the non-infective stage of S. stercoralis that cannot penetrate tissue. This suggests that the larvae migrated from the intestines to connected organs.

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  • 28. 

    A person is infected with pinworms by ingesting parasitic stage either directly or indirectly.

    • Cysts

    • Sporocysts

    • Eggs

    • Larvae

    Correct Answer
    A. Eggs
    Explanation
    Pinworms are a type of parasitic worm that infects the human intestinal tract. The correct answer is "Eggs" because pinworm infection occurs when a person ingests the eggs of the pinworm. These eggs are typically found in contaminated food, water, or surfaces that have been touched by someone with a pinworm infection. Once ingested, the eggs hatch in the small intestine, and the larvae mature into adult worms in the large intestine. Therefore, the ingestion of pinworm eggs is the primary mode of transmission for this parasitic infection.

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  • 29. 

    The cyst of G. lumblia excreted in stool are responsible for spreading the infections:

    • Immature cysts with 2 nuclei

    • Mature cysts with 4 nuclei

    • Immature cysts with nuclei

    • Mature cysts with 2 nuclei

    Correct Answer
    A. Mature cysts with 4 nuclei
    Explanation
    Mature cysts with 4 nuclei are responsible for spreading the infections caused by G. lumblia. These cysts are fully developed and contain four nuclei, which are the reproductive structures of the parasite. When these cysts are excreted in stool, they can contaminate the environment and spread the infection to others. The presence of four nuclei in the mature cysts indicates that they are capable of reproducing and causing further infection.

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  • 30. 

    Cryptosporodium is a protozoan parasite affecting the gastrointestinal tract of humans and animals. It is shed in the feces in the form of:

    • Cyst

    • Tachyzoite

    • Oocyte

    • Bradyzoite

    Correct Answer
    A. Oocyte
    Explanation
    Cryptosporidium is a protozoan parasite that primarily affects the gastrointestinal tract. It is shed in the feces of infected individuals in the form of oocysts. Oocysts are the infective stage of the parasite and are resistant to environmental conditions, allowing them to survive outside the host and spread the infection to others. Therefore, the correct answer is oocyte, which refers to the oocyst stage of Cryptosporidium.

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  • 31. 

    Parasitic infection is caused by a small, thin, white roundworms called:

    • Ancylostoma duodenale

    • Trichinella species

    • Capillaria species

    • E. vermicularis

    Correct Answer
    A. E. vermicularis
    Explanation
    E. vermicularis is the correct answer because it is a small, thin, white roundworm that causes parasitic infection. Ancylostoma duodenale is a hookworm that causes a different type of infection. Trichinella species and Capillaria species are also types of roundworms, but they cause different types of infections and are not specifically associated with parasitic infection.

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  • 32. 

    Enteriobius vermicularis or pinworm is one of the most common parasite in humans affecting mainly in children. The following statements humans get infected are correct except:

    • By the fecal-oral route.

    • By ingesting the parasite's eggs.

    • From contaminated foods or water.

    • By penetrating thru the skin.

    Correct Answer
    A. By penetrating thru the skin.
    Explanation
    Enterobius vermicularis, or pinworm, is primarily transmitted through the fecal-oral route. This means that individuals become infected by ingesting the parasite's eggs, which are present in contaminated food or water. The eggs are typically ingested accidentally, often by touching contaminated surfaces and then putting hands or fingers in the mouth. The parasite does not penetrate through the skin as a mode of transmission.

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  • 33. 

    Parasitic infections are more common within families with school-aged children.

    • Ancylostoma duodenale

    • Trichinella species

    • Capillaria species

    • Option 4

    Correct Answer
    A. Option 4
    Explanation
    Option 4 is the correct answer because Capillaria species are known to cause parasitic infections in humans, particularly in the intestines. These infections are more common within families with school-aged children because children are more likely to come into contact with the parasites through contaminated soil or food. Ancylostoma duodenale and Trichinella species are also parasites that can cause infections in humans, but they are not specifically associated with being more common within families with school-aged children.

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  • 34. 

    The parasite Entamoeba histolytica. feed upon elements to grow in size and again multiply, except on:

    • The bacteria

    • The host's tissue

    • The blood

    • The nutrition

    Correct Answer
    A. The bacteria
    Explanation
    Entamoeba histolytica is a parasite that feeds on various elements to grow and multiply, but it does not feed on bacteria. This means that it does not rely on bacteria as a food source for its growth and reproduction. Instead, it feeds on other substances such as the host's tissue, blood, and nutrition.

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  • 35. 

    Capillaria hepatica (C. hepatica) is a nematide parasite of wild rodents and other mammals and has worldwide distribution. Adult worms colonize:

    • The muscle of the host

    • The lumen of intestine of the host

    • The lungs of the host

    • The liver of the host

    Correct Answer
    A. The liver of the host
    Explanation
    C. hepatica is a nematode parasite that primarily colonizes the liver of its host. This parasite has a worldwide distribution and infects various mammals, including wild rodents. By colonizing the liver, C. hepatica can cause hepatomegaly and liver damage, leading to various clinical manifestations. The other options mentioned, such as the muscle, intestine, and lungs, are not the primary sites of colonization for C. hepatica.

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  • 36. 

    The adults of Capillaria philippinensis (males: 2.3 to 3.2mm; females: 2.5 to 4.3mm) reside in the human:

    • Small intestine

    • Large intestine

    • Blood stream

    • Muscle

    Correct Answer
    A. Small intestine
    Explanation
    Capillaria philippinensis is a type of parasitic worm that infects humans. The given information states that the adults of this worm reside in the human body. The sizes of the males and females are also provided. Based on this information, it can be inferred that Capillaria philippinensis resides in the small intestine of humans.

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  • 37. 

    Free-living cycle: The rhabditiform larvae passed in the stool.

    • Ancylostoma duodenale

    • Strongyloides stercoralis

    • Trichinella species

    • Capillaria species

    Correct Answer
    A. Strongyloides stercoralis
    Explanation
    Strongyloides stercoralis is the correct answer because it is the only parasite listed that has a free-living cycle in which the rhabditiform larvae are passed in the stool. Ancylostoma duodenale, Trichinella species, and Capillaria species do not have a free-living cycle and do not pass rhabditiform larvae in the stool.

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  • 38. 

    It is a host in which the parasitic reaches maturity and sexually reproduces within.

    • Reservoir host

    • Intermediate host

    • Definitive host

    • Accidental host

    Correct Answer
    A. Definitive host
    Explanation
    A definitive host is a host in which a parasite reaches maturity and sexually reproduces. This means that the parasite completes its life cycle and can produce offspring within the definitive host. Other hosts may also play a role in the life cycle of the parasite, but the definitive host is the one where the parasite reaches its final stage of development.

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  • 39. 

    Capillaria spp: Ingesting by freshwater fish, larvae hatch, penetrate the intestine and migrate to the tissue.

    • Eggs

    • Cysts

    • Unembryonated eggs

    • Embryonated eggs

    Correct Answer
    A. Embryonated eggs
    Explanation
    Embryonated eggs are the correct answer because the given explanation states that Capillaria spp, a type of parasite, is ingested by freshwater fish. Once ingested, the eggs of Capillaria spp hatch and the larvae penetrate the fish's intestine. From there, the larvae migrate to the fish's tissue. This implies that the eggs of Capillaria spp must be embryonated, meaning they contain an embryo that is ready to hatch. Therefore, the correct answer is embryonated eggs.

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  • 40. 

    The other Trichinella species cannot be found in encystation, except: 

    • T. spiralis

    • T. pseudospiralis

    • T. papuae

    • T. zimbabwensis

    Correct Answer
    A. T. spiralis
    Explanation
    T. spiralis is the only Trichinella species that can be found in encystation. The other species mentioned, T. pseudospiralis, T. papuae, and T. zimbabwensis, do not undergo encystation.

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  • 41. 

    The roundworms constitute an unusual group of organisms in the phylum Nematoda, in that they all live a part of their lives as intracellular parasites.

    • Ancylostoma duodenale

    • Strongyloides sterocoralis

    • Trichinella species

    • Capillaria species

    Correct Answer
    A. Trichinella species
    Explanation
    The given answer, Trichinella species, is correct because it is a type of roundworm that belongs to the phylum Nematoda. Trichinella species are known for their unique life cycle as intracellular parasites, meaning they live inside the cells of their host organisms. This distinguishes them from other roundworms mentioned in the options, such as Ancylostoma duodenale, Strongyloides sterocoralis, and Capillaria species, which may be parasites but do not necessarily live intracellularly.

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  • 42. 

    Parasitic stage can also be occasionally transmitted via mother's milk.

    • Ancylostoma duodenale

    • Strongyloides stercoralis

    • Trichinella speices

    • Capillaria species

    Correct Answer
    A. Strongyloides stercoralis
    Explanation
    Strongyloides stercoralis is a parasitic nematode that can infect humans. It has a unique lifecycle that includes a parasitic stage and a free-living stage. The parasitic stage of Strongyloides stercoralis can infect humans through direct contact with contaminated soil, but it can also be transmitted from mother to child through breastfeeding. This means that if a mother is infected with Strongyloides stercoralis, she can pass the infection to her child through her milk. This mode of transmission is known as vertical transmission. Therefore, the statement that the parasitic stage can occasionally be transmitted via mother's milk is true for Strongyloides stercoralis.

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  • 43. 

    It is a host that harbors the parasitic only for a short transition period, usually allowing for the completion of a developmental stage.

    • Reservoir host

    • Intermediate host

    • Definitive host 

    • Accidental host

    Correct Answer
    A. Intermediate host
    Explanation
    An intermediate host is a host that harbors a parasite only for a short transition period, usually allowing for the completion of a developmental stage. This means that the parasite uses the intermediate host to undergo a specific phase of its life cycle before moving on to its definitive host, where it will reach sexual maturity and reproduce. The intermediate host is not the permanent host for the parasite, but rather serves as a temporary environment for its development.

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  • 44. 

    These histological findings were typical of acute disease. he patient recovered well after surgery and mebendazole has been prescribed for him as well as his close family members.

    • S. stercoralis

    • Capillaria species

    • E. vermicularis

    • A. lambricoides

    Correct Answer
    A. E. vermicularis
    Explanation
    The given histological findings being typical of acute disease suggest that the patient had an acute infection. The patient's recovery after surgery and the prescription of mebendazole for him and his close family members indicate that the infection was likely caused by a parasitic worm. Among the options provided, E. vermicularis, also known as pinworm, is the most common parasitic worm that infects humans and is associated with acute disease. Therefore, E. vermicularis is the most likely cause of the infection in this case.

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  • 45. 

    Trichinella species: Mating takes place in the host:

    • Small intestine

    • Large intestine

    • Blood stream

    • Alveolus space

    Correct Answer
    A. Small intestine
    Explanation
    Trichinella species are parasitic worms that infect mammals, including humans. They have a complex life cycle that involves multiple stages. Mating in Trichinella species occurs in the small intestine of the host. This is where the male and female worms come together to reproduce and produce offspring. The small intestine provides a suitable environment for the mating process to occur, allowing for the continuation of the Trichinella life cycle.

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  • 46. 

    In such cases sexually mature female worms are also found in the lungs, and less frequently in other organs.

    • Ascaris lambricoides

    • Ancylostoma duodenale

    • Strongyloides stercoralis

    • Trichinella species

    Correct Answer
    A. Strongyloides stercoralis
    Explanation
    In cases where sexually mature female worms are found in the lungs and occasionally in other organs, the most likely culprit is Strongyloides stercoralis. This parasitic worm is known to infect humans and can cause a condition called strongyloidiasis. The female worms of Strongyloides stercoralis can migrate to various organs, including the lungs, leading to respiratory symptoms. Therefore, Strongyloides stercoralis is the correct answer in this context.

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  • 47. 

    Pathology if Ascaris lumbricoides is due:

    • Its egg stage

    • Its larval stage

    • Its adult stage

    • Its larval and adult stage

    Correct Answer
    A. Its larval and adult stage
    Explanation
    The correct answer is "Its larval and adult stage". Ascaris lumbricoides is a parasitic roundworm that infects humans. The life cycle of Ascaris involves both larval and adult stages. The larval stage begins when the eggs are ingested, usually through contaminated food or water. The larvae then hatch in the intestines and migrate through the bloodstream to the lungs. In the lungs, they mature into adults and eventually travel back to the intestines, where they reproduce and lay eggs. Therefore, both the larval and adult stages of Ascaris lumbricoides contribute to its pathology.

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  • 48. 

    Ascaris lumbricoides: parasitic stage(s) may cause effects die to its mechanical effects. It may cause blockage of the intestine.

    • Its egg stage

    • Its larval stage

    • Its adult stage 

    • Its larval and adult stage

    Correct Answer
    A. Its adult stage 
    Explanation
    The adult stage of Ascaris lumbricoides may cause effects due to its mechanical effects. It can cause blockage of the intestine.

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  • 49. 

    The stage of Entamoeba called is there are feeding and pathogenic forms.

    • The larval stage

    • The young stage

    • The adult stage

    • The cystic stage

    Correct Answer
    A. The cystic stage
    Explanation
    The correct answer is the cystic stage. Entamoeba is a genus of parasitic amoebas that can cause diseases in humans, such as amoebic dysentery. The cystic stage is a dormant and resistant form of the parasite that allows it to survive outside the host and be transmitted to new hosts. In this stage, the amoeba is enclosed in a protective cyst wall and is not actively feeding or causing disease.

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Quiz Review Timeline (Updated): Jan 23, 2023 +

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  • Current Version
  • Jan 23, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Mar 10, 2019
    Quiz Created by
    Byun Nexi

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