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What are the two known morphologic forms of the filariae?
What are the two known morphologic forms of the filariae?
Adult worms and larvae known as microfilariae
What is the name given to the delicate transparent covering found around some microfilariae?
What is the name given to the delicate transparent covering found around some microfilariae?
Sheath
What is the name of the fleshy extension of the scolex known as a rostellum present in some tapeworms?
What is the name of the fleshy extension of the scolex known as a rostellum present in some tapeworms?
Rostellum
The ______ is the name given to the group of individual segments that make up the body of a tapeworm.
The ______ is the name given to the group of individual segments that make up the body of a tapeworm.
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What is a zoonosis?
What is a zoonosis?
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Which of the following parasites exhibits nocturnal periodicity?
Which of the following parasites exhibits nocturnal periodicity?
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What is the most common laboratory diagnostic method for identifying filariae?
What is the most common laboratory diagnostic method for identifying filariae?
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What is the name given to the swelling of the lower extremities caused by the obstruction of the lymphatic system?
What is the name given to the swelling of the lower extremities caused by the obstruction of the lymphatic system?
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What is the name given to the swelling of the subcutaneous tissues known as Calabar swellings?
What is the name given to the swelling of the subcutaneous tissues known as Calabar swellings?
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Which of the following is the most important drug used for treating filariasis?
Which of the following is the most important drug used for treating filariasis?
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The vector for Wuchereria bancrofti is the Culex mosquito.
The vector for Wuchereria bancrofti is the Culex mosquito.
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Which of the following filarial nematodes is most commonly found in the subtropical and tropical areas of the world?
Which of the following filarial nematodes is most commonly found in the subtropical and tropical areas of the world?
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Which of the following filarial nematodes is known as the Malayan filaria?
Which of the following filarial nematodes is known as the Malayan filaria?
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The adult worms of Brugia malayi are typically larger than the adult worms of Wuchereria bancrofti.
The adult worms of Brugia malayi are typically larger than the adult worms of Wuchereria bancrofti.
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What is the common name for Loa loa?
What is the common name for Loa loa?
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What is the name of the disease caused by Loa loa?
What is the name of the disease caused by Loa loa?
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The adult worms of Loa loa typically reside in the lymphatic system.
The adult worms of Loa loa typically reside in the lymphatic system.
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Which of the following filarial nematodes is the most important cause of river blindness?
Which of the following filarial nematodes is the most important cause of river blindness?
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The microfilariae of Onchocerca volvulus exhibit nocturnal periodicity.
The microfilariae of Onchocerca volvulus exhibit nocturnal periodicity.
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The adults filariae of Onchocerca volvulus typically are found inside the lymphatic system.
The adults filariae of Onchocerca volvulus typically are found inside the lymphatic system.
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What is the name of the vector that transmits Onchocerca volvulus?
What is the name of the vector that transmits Onchocerca volvulus?
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The microfilariae of Mansonella ozzardi are characterized by the presence of a sheath.
The microfilariae of Mansonella ozzardi are characterized by the presence of a sheath.
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Mansonella ozzardi is a common cause of severe disease in humans.
Mansonella ozzardi is a common cause of severe disease in humans.
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Which of the following drugs can be used to treat Mansonella ozzardi infection?
Which of the following drugs can be used to treat Mansonella ozzardi infection?
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The microfilariae of Mansonella perstans are characterized by the presence of a sheath.
The microfilariae of Mansonella perstans are characterized by the presence of a sheath.
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Mansonella perstans is a common cause of severe disease in humans.
Mansonella perstans is a common cause of severe disease in humans.
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Which of the following drugs is the most effective treatment for Mansonella perstans infection?
Which of the following drugs is the most effective treatment for Mansonella perstans infection?
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What is the name of the insect that acts as the vector for both Mansonella ozzardi and Mansonella perstans?
What is the name of the insect that acts as the vector for both Mansonella ozzardi and Mansonella perstans?
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What is the name given to the larval stage of a tapeworm that is characterized by the presence of six hooklets?
What is the name given to the larval stage of a tapeworm that is characterized by the presence of six hooklets?
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Which of the following is NOT a characteristic of a tapeworm?
Which of the following is NOT a characteristic of a tapeworm?
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What is the name given to the anterior end of a tapeworm, which is often equipped with suckers and a rostellum?
What is the name given to the anterior end of a tapeworm, which is often equipped with suckers and a rostellum?
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What is the name given to the individual segments that make up the body of a tapeworm?
What is the name given to the individual segments that make up the body of a tapeworm?
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Taenia saginata is a zoonotic parasite.
Taenia saginata is a zoonotic parasite.
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What is the name given to the larva of Taenia solium that is found in the muscle tissue of pigs?
What is the name given to the larva of Taenia solium that is found in the muscle tissue of pigs?
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What is the commonly used treatment for Taenia saginata and Taenia solium infection?
What is the commonly used treatment for Taenia saginata and Taenia solium infection?
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Taenia saginata is characterized by a rostellum that has a double crown of hooks.
Taenia saginata is characterized by a rostellum that has a double crown of hooks.
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What is the name given to the condition caused by infection with Taenia saginata?
What is the name given to the condition caused by infection with Taenia saginata?
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Hymenolepis diminuta is an intestinal parasite of humans.
Hymenolepis diminuta is an intestinal parasite of humans.
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Hymenolepis nana is characterized by the presence of an armed rostellum with hooks, while Hymenolepis diminuta has a rostellum that lacks hooks.
Hymenolepis nana is characterized by the presence of an armed rostellum with hooks, while Hymenolepis diminuta has a rostellum that lacks hooks.
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Hymenolepis nana is the most common tapeworm in humans.
Hymenolepis nana is the most common tapeworm in humans.
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What is the name given to the larval stage of Hymenolepis diminuta?
What is the name given to the larval stage of Hymenolepis diminuta?
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Dipylidium caninum is also called the dog or cat tapeworm.
Dipylidium caninum is also called the dog or cat tapeworm.
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What is the name given to the small, club-shaped armed rostellum found on the scolex of Dipylidium caninum?
What is the name given to the small, club-shaped armed rostellum found on the scolex of Dipylidium caninum?
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What is the name given to the egg packets of Dipylidium caninum?
What is the name given to the egg packets of Dipylidium caninum?
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Diphyllobothrium latum is a zoonotic parasite.
Diphyllobothrium latum is a zoonotic parasite.
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The eggs of Diphyllobothrium latum contain a hexacanth embryo.
The eggs of Diphyllobothrium latum contain a hexacanth embryo.
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What is the name given to the larval stage of Diphyllobothrium latum that develops in the muscle tissue of freshwater fish?
What is the name given to the larval stage of Diphyllobothrium latum that develops in the muscle tissue of freshwater fish?
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What is the common name for the larval stage of Diphyllobothrium latum that develops in the copepod?
What is the common name for the larval stage of Diphyllobothrium latum that develops in the copepod?
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What is the name of the condition caused by infection with Diphyllobothrium latum?
What is the name of the condition caused by infection with Diphyllobothrium latum?
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Echinococcus granulosus is the most common cause of hydatid disease in humans.
Echinococcus granulosus is the most common cause of hydatid disease in humans.
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The eggs of Echinococcus granulosus are identical to the eggs of Taenia saginata.
The eggs of Echinococcus granulosus are identical to the eggs of Taenia saginata.
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What is the name given to the fluid-filled sac that develops in the tissues of humans infected with Echinococcus granulosus?
What is the name given to the fluid-filled sac that develops in the tissues of humans infected with Echinococcus granulosus?
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What is the name given to the structures that develop within the brood capsules of a hydatid cyst?
What is the name given to the structures that develop within the brood capsules of a hydatid cyst?
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Echinococcus granulosus is typically found in humans.
Echinococcus granulosus is typically found in humans.
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Which of the following is the most effective treatment for a hydatid cyst?
Which of the following is the most effective treatment for a hydatid cyst?
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Echinococcus multilocularis is a common parasite of humans.
Echinococcus multilocularis is a common parasite of humans.
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The larval stage of Echinococcus granulosus is typically found in the brain, eyes, or other tissues.
The larval stage of Echinococcus granulosus is typically found in the brain, eyes, or other tissues.
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The adult worms of Echinococcus granulosus are typically found in muscle tissue.
The adult worms of Echinococcus granulosus are typically found in muscle tissue.
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What is the name of the cyst that develops within a hydatid cyst?
What is the name of the cyst that develops within a hydatid cyst?
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The scolices within a cyst are capable of developing into adult worms when they are ingested by a definitive host.
The scolices within a cyst are capable of developing into adult worms when they are ingested by a definitive host.
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The eggs of Echinococcus granulosus are typically passed in the feces of humans.
The eggs of Echinococcus granulosus are typically passed in the feces of humans.
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The eggs of Echinococcus granulosus can sometimes be found in the muscle tissue of sheep.
The eggs of Echinococcus granulosus can sometimes be found in the muscle tissue of sheep.
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The adult worms of Echinococcus granulosus have a rostellum with hooks.
The adult worms of Echinococcus granulosus have a rostellum with hooks.
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Study Notes
Filariae
- Filariae are a group of nematodes, parasitic worms
- Adults live in tissues or lymphatic systems
- Adult filariae produce microfilariae, which are usually found in the blood
- Microfilariae exhibit periodicity (timing of occurrences)
- Periodicities are linked to vector feeding schedules
- Four species of filariae are discussed:
- Wuchereria bancrofti
- Brugia malayi
- Loa loa
- Onchocerca volvulus
- Other filarial organisms: Mansonella ozzardi and Mansonella perstans
- These species can be nonpathogenic in humans.
Learning Objectives
- Define key terms related to filarial worms
- State geographic distribution of each filariae
- State common names for each filariae
- Select filarial parasites from a list
- Summarize life cycle of each filarial worm
- Identify vectors responsible for filarial transmission
- Describe populations prone to filarial disease
- Explain collection, processing, and diagnostics for each filarial parasite
- Describe each of the following as they relate to filarial worms:
- Disease or condition
- Prognosis
- Treatment
- Prevention and control methods
- Explain the significance of collection time for parasite recovery
- Correctly label structures of filarial parasites in diagrams
- Describe purpose of structures
- Identify filarial organisms by scientific name, common name, and morphologic form
Laboratory Diagnosis
- Microscopic examination of microfilariae in Giemsa-stained blood smears or tissue scrapings is the primary diagnostic method
- Techniques like the Knott technique can be used to concentrate microfilariae
- Serologic tests are also available to diagnose specific filarial infections but may lack specificity
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Description
This quiz covers the essential aspects of filariae, including their life cycles, geographic distribution, and key terms. Learn about various species such as Wuchereria bancrofti and Loa loa, and understand their impact on human health. Assess your knowledge on filarial transmission and affected populations.
