Question:
The breeding ground for the vectors of Japanese B virus is
The breeding ground for the vectors of Japanese B virus is
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Think of the mosquito genus linked to rice-growing regions and pig rearing.
Updated On: Jul 16, 2026
- Paddy field
- Mixed garbage
- Cooler water
- Stale food
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Question:
This question tests knowledge of the ecology and transmission cycle of Japanese encephalitis (Japanese B virus), a mosquito-borne viral infection important in community medicine and public health.
Step 2: Key Concept or Approach:
Japanese encephalitis virus is transmitted by Culex mosquitoes, mainly Culex tritaeniorhynchus and related species of the Culex vishnui group. These mosquitoes breed preferentially in shallow, sunlit, stagnant fresh water with vegetation, exactly the conditions found in irrigated rice paddy fields. This is why the disease shows a strong seasonal and geographic link to paddy cultivation, often occurring together with pig rearing nearby, since pigs act as amplifying hosts for the virus.
Step 3: Working Through the Options:
Paddy fields provide the shallow, stagnant, vegetation-rich water that the Culex vectors of Japanese encephalitis need to breed in large numbers. Mixed garbage and stale food are breeding and feeding sites for filth flies and cockroaches, not for the mosquito vectors of this disease. Cooler water, meaning small clean-water containers such as desert coolers, is the classic breeding site for Aedes aegypti, the vector of dengue and chikungunya, not of Japanese encephalitis.
Step 4: Conclusion:
Paddy field is correct, because it is the natural breeding habitat of the Culex mosquitoes that transmit Japanese encephalitis.
This question tests knowledge of the ecology and transmission cycle of Japanese encephalitis (Japanese B virus), a mosquito-borne viral infection important in community medicine and public health.
Step 2: Key Concept or Approach:
Japanese encephalitis virus is transmitted by Culex mosquitoes, mainly Culex tritaeniorhynchus and related species of the Culex vishnui group. These mosquitoes breed preferentially in shallow, sunlit, stagnant fresh water with vegetation, exactly the conditions found in irrigated rice paddy fields. This is why the disease shows a strong seasonal and geographic link to paddy cultivation, often occurring together with pig rearing nearby, since pigs act as amplifying hosts for the virus.
Step 3: Working Through the Options:
Paddy fields provide the shallow, stagnant, vegetation-rich water that the Culex vectors of Japanese encephalitis need to breed in large numbers. Mixed garbage and stale food are breeding and feeding sites for filth flies and cockroaches, not for the mosquito vectors of this disease. Cooler water, meaning small clean-water containers such as desert coolers, is the classic breeding site for Aedes aegypti, the vector of dengue and chikungunya, not of Japanese encephalitis.
Step 4: Conclusion:
Paddy field is correct, because it is the natural breeding habitat of the Culex mosquitoes that transmit Japanese encephalitis.
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