Vector of malaria is?

IGNOU Post B. SC. Nursing entrance -2021

Microbiology

Easy

Appeared in: IGNOU Post B. SC. Nursing entrance -2021

Explanation

The definitive vector for malaria is the female Anopheles mosquito, which transmits the Plasmodium parasite to humans during a blood meal.
Only female mosquitoes are haematophagous (blood-feeding) because they require the proteins in blood for the development of their eggs.
The life cycle of the malaria parasite involves a crucial developmental stage within the mosquito, making it an essential biological vector, not just a mechanical carrier.
Anopheles mosquitoes are the specific genus responsible for malaria transmission, distinguishing them from other genera like Culex or Aedes.

Option A: This option is incorrect for two reasons: 1) Male mosquitoes do not take blood meals and therefore do not transmit diseases to humans. 2) The genus Culex is incorrect; it transmits other diseases like Japanese Encephalitis and Filariasis, not malaria.
Option C: The sand fly is a vector for different diseases, most notably Leishmaniasis (Kala-azar), but it does not transmit the Plasmodium parasite that causes malaria.
Option D: While female mosquitoes are the ones that bite, the Culex genus is not the vector for malaria. This genus is primarily associated with the transmission of Japanese Encephalitis, West Nile Fever, and Filariasis.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Vector-borne disease transmission as background academic context rather than a clinical decision trigger.
A nurse's understanding of vector-borne diseases is critical for patient education on prevention, especially in endemic areas or for patients traveling to such regions.
Key nursing interventions focus on primary prevention: advising on the use of mosquito nets (LLINs), repellents, protective clothing, and environmental control to eliminate breeding sites.
Recognizing the peak biting times of the Anopheles mosquito (dusk to dawn) allows for targeted advice on protective measures during these high-risk periods.

How to Approach the Question

First, identify the keywords in the question: 'Vector' and 'malaria'. This is a factual recall question about disease transmission.
Recall the specific biological vector for malaria. The disease name is directly linked to a specific genus of mosquito.
Evaluate the options based on two key factors: the genus of the mosquito (Anopheles, Culex, etc.) and the sex (male or female).
Remember that only female mosquitoes take blood meals and transmit diseases. This immediately eliminates any options involving male mosquitoes.
Differentiate between the diseases transmitted by different mosquito genera. Associate Anopheles with malaria, Culex with encephalitis/filariasis, and Aedes with dengue/zika.
Select the option that correctly identifies both the sex (female) and the genus (Anopheles) responsible for malaria transmission.

Concept Tested & Keywords

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