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Difficulty: MediumHuman Physiology, Health, and Diseases

In the study of human health, communicable diseases are classified by their causative pathogens and mode of transmission. Which of the following statements regarding infectious human diseases are correct?

  1. Dengue fever and Zika virus infection are both viral diseases transmitted to humans primarily through the bite of infected Aedes mosquitoes.Answer
  2. African trypanosomiasis (sleeping sickness) is caused by a protozoan parasite and is transmitted through the bite of infected tsetse flies.Answer
  3. C
    Trachoma, a major cause of preventable blindness, is caused by a viral infection spread through contaminated drinking water.
  4. D
    Malaria is caused by a bacterial pathogen that multiplies within human erythrocytes following transmission by male Anopheles mosquitoes.

Answer

The correct statements are: (1) Dengue fever and Zika virus infection are viral diseases transmitted via Aedes mosquitoes, and (2) African trypanosomiasis is a protozoan disease transmitted by tsetse flies.
The statements confirming that Dengue and Zika are viral infections transmitted by Aedes mosquitoes, and that African trypanosomiasis is a protozoan disease transmitted by tsetse flies, are scientifically accurate.

Step-by-Step Solution

1
Evaluate statement regarding Dengue and Zika viruses
Dengue and Zika are both arboviruses (flaviviruses) transmitted by female Aedes mosquitoes (Aedes aegypti and Aedes albopictus). The statement is correct.
Accurate pathogen and vector classification.
2
Evaluate statement regarding African trypanosomiasis
Sleeping sickness is caused by protozoan parasites of the genus Trypanosoma and transmitted by tsetse flies. The statement is correct.
Correct identification of protozoan etiology and insect vector.
3
Evaluate statement regarding Trachoma
Trachoma is caused by the bacterium Chlamydia trachomatis, not a virus, and spreads via direct contact and flies rather than contaminated water. The statement is incorrect.
Conflating bacterial pathogen with viral etiology.
4
Evaluate statement regarding Malaria
Malaria is caused by Plasmodium protozoa (not bacteria) and transmitted by female Anopheles mosquitoes (male mosquitoes feed on plant nectar). The statement is incorrect.
Misidentifying pathogen group and mosquito vector sex.

Key Concept

Classification of infectious human diseases by pathogen type (viral, bacterial, protozoan) and vector transmission mechanism.
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Topics

Human Physiology, Health, and Diseases

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