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Question

Difficulty: MediumHuman Physiology, Health, and Diseases

Epidemiological studies and public health assessments rely on precise categorization of infectious human diseases, their biological pathogens, and transmission vectors. Which of the following statements regarding communicable human diseases are correct?

  1. Poliomyelitis is a viral infection caused by an enterovirus that is primarily transmitted through the fecal-oral route and can lead to irreversible motor paralysis.Answer
  2. Schistosomiasis is a parasitic disease caused by trematode flatworms that utilize freshwater snails as intermediate hosts during their lifecycle.Answer
  3. C
    Hepatitis A is a bacterial infection of the liver that is vector-borne and transmitted to humans exclusively via bites from female Anopheles mosquitoes.
  4. D
    Ascariasis is a fungal respiratory disease caused by inhalation of saprophytic spores produced by Ascaris lumbricoides.

Answer

The correct statements are those identifying Poliomyelitis as a viral enteroviral infection spread via the fecal-oral route and Schistosomiasis as a trematode parasite infection involving freshwater snail hosts.
Poliomyelitis is caused by an enterovirus transmitted via the fecal-oral route, and Schistosomiasis is a parasitic trematode infection reliant on freshwater snails as intermediate hosts. Both statements accurately reflect physiological and epidemiological facts.

Step-by-Step Solution

1
Evaluate the pathogen class and primary transmission route of Poliomyelitis.
Poliomyelitis is accurately identified as a viral disease (enterovirus) spread by the fecal-oral route.
Confirming the biological classification confirms the statement regarding Poliomyelitis is correct.
2
Analyze the life cycle and intermediate hosts of Schistosomiasis.
Schistosomiasis is caused by trematode flatworms (blood flukes) that develop inside freshwater snails before infecting human hosts.
Confirming the parasite lifecycle confirms the statement regarding Schistosomiasis is correct.
3
Examine the causative pathogen and mode of transmission for Hepatitis A.
Hepatitis A is a viral infection (HAV) spread via fecal-oral contamination, not a vector-borne bacterial disease.
Identifying pathogen and vector misattributions demonstrates the statement regarding Hepatitis A is incorrect.
4
Examine the biological classification of Ascaris lumbricoides.
Ascaris lumbricoides is a parasitic nematode (helminthic roundworm), not a fungus.
Identifying kingdom-level misclassification demonstrates the statement regarding Ascariasis is incorrect.

Key Concept

Human Infectious Disease Etiology, Pathogen Classification, and Transmission Pathways
Estimated Time:1m 30s
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Topics

Human Physiology, Health, and Diseases

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