Which of the following diseases is not transmitted by Aedes mosquitoes?

Appeared in: Haryana CHO - 2022

Explanation

West Nile virus is the correct choice as it is transmitted by mosquitoes of the Culex genus, not Aedes.
The primary vectors for West Nile virus are Culex molestus and Culex univittatus.
Culex mosquitoes are characteristically night-biting insects, contrasting with the day-biting habits of Aedes mosquitoes.
The other three options—Zika, Yellow fever, and Chikungunya—are all well-known diseases transmitted by Aedes species mosquitoes.

Option B: This is incorrect because Zika virus is transmitted by Aedes mosquitoes, particularly Aedes aegypti and Aedes albopictus.
Option C: This is incorrect. Yellow fever is a viral hemorrhagic fever transmitted by the bite of infected Aedes mosquitoes, most notably Aedes aegypti.
Option D: This is incorrect. Chikungunya virus is transmitted to humans by the bites of infected Aedes aegypti and Aedes albopictus mosquitoes.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Vector-borne diseases and their specific mosquito carriers as background academic context rather than a clinical decision trigger.
Understanding the specific vector is crucial for public health nurses to implement targeted control measures, such as source reduction for Aedes (clean water) versus managing polluted water for Culex.
Patient education on personal protective measures should be tailored to the vector's biting habits. For example, daytime protection is key for Aedes-borne diseases, while nighttime protection is vital for Culex-borne diseases.
What if? If the question asked for a disease transmitted by the Anopheles mosquito, the answer would be Malaria, as Anopheles is its primary vector.

How to Approach the Question

First, identify the negative keyword 'not' in the question stem. This indicates you are looking for the option that is an exception.
The core concept of the question is diseases transmitted by 'Aedes mosquitoes'.
Systematically evaluate each option against this core concept.
Recall or determine the primary mosquito vector for each disease: Zika (Aedes), Yellow fever (Aedes), Chikungunya (Aedes), and West Nile virus (Culex).
The option that does not fit the category is West Nile virus, as it is transmitted by Culex mosquitoes, making it the correct answer.

Concept Tested & Keywords

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E6 Nelson Textbook of Pediatrics(2024) — Volume 1 p. 2073-2075

E6 Parks TextBook of Preventive & Social Medicine part 2 — Subpart B (pp 233-449 of 464) p. 87-89

Practise the full Haryana CHO - 2022

Attempt every question from this paper in a timed mock, then review the full solution for each one.