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Questions and Answers
Which helminth transmission mechanism poses the greatest risk of infection due to the inadvertent consumption of contaminated food or water?
Which helminth transmission mechanism poses the greatest risk of infection due to the inadvertent consumption of contaminated food or water?
- Accidental ingestion of infective eggs or larvae from contaminated sources. (correct)
- Active skin penetration by filariform larvae in soil.
- Ingestion of encysted larvae in undercooked meat.
- Consumption of raw fish containing metacercariae.
A patient presents with dermatitis and ground itch, followed by respiratory symptoms and eventually iron deficiency anemia. Which helminthic infection route is MOST consistent with these findings?
A patient presents with dermatitis and ground itch, followed by respiratory symptoms and eventually iron deficiency anemia. Which helminthic infection route is MOST consistent with these findings?
- Ingestion of raw or undercooked freshwater fish.
- Consumption of improperly cooked pork.
- Direct transmission through insect bites
- Penetration of the skin by larvae. (correct)
A parasitic infection is traced to the consumption of raw freshwater fish. Which helminth is MOST likely responsible for this mode of transmission?
A parasitic infection is traced to the consumption of raw freshwater fish. Which helminth is MOST likely responsible for this mode of transmission?
- Clonorchis sinensis. (correct)
- Schistosoma japonicum
- Trichinella spiralis.
- Ancylostoma duodenale.
How does the life cycle of Strongyloides stercoralis uniquely facilitate both direct and indirect transmission, and what implications does this have for infection control strategies?
How does the life cycle of Strongyloides stercoralis uniquely facilitate both direct and indirect transmission, and what implications does this have for infection control strategies?
Which of the following statements accurately describes a key difference in the transmission mechanisms of Schistosoma spp. compared to Trichinella spiralis?
Which of the following statements accurately describes a key difference in the transmission mechanisms of Schistosoma spp. compared to Trichinella spiralis?
Flashcards
Helminth Transmission
Helminth Transmission
Ways helminths infect humans, including ingestion and skin penetration.
Accidental Ingestion
Accidental Ingestion
Inhaling infective eggs or larvae, leading to helminth infection.
Active Skin Penetration
Active Skin Penetration
When larvae penetrate human skin, causing infection.
Intermediate Host Ingestion
Intermediate Host Ingestion
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Specific Helminths
Specific Helminths
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Study Notes
Helminth Transmission Mechanisms
- Helminths (parasitic worms) are transmitted to humans through various means.
- Ingestion: Humans can ingest infective eggs or larvae. (e.g., some hookworms).
- Skin Penetration: Larvae can actively penetrate the skin. (e.g., hookworms, schistosomes, Strongyloides).
- Intermediate Host Consumption: Larvae can reside in intermediate hosts (e.g., fish, meat). Consuming these infected hosts transmits the helminth. (e.g., Clonorchis in fish, tapeworms in meat/fish, Trichinella in meat).
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