The spread of which of the following diseases are not caused by mosquitos.

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  1. malaria
  2. dengue
  3. typhoid
  4. chikungunya

Answer (Detailed Solution Below)

Option 3 : typhoid
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Detailed Solution

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The correct answer is typhoid.

Key Points

  • Typhoid is not transmitted by mosquitoes
  • It is caused by the bacterium Salmonella Typhi
  • Spread through contaminated food and water
  • Common in areas with poor sanitation
  • Symptoms include high fever, weakness, and abdominal pain

​ Additional Information

  • Malaria:
    • Caused by Plasmodium parasites
    • Transmitted by female Anopheles mosquitoes
    • Symptoms include fever, chills, and flu-like illness
    • Endemic in tropical and subtropical regions
    • Prevention includes mosquito nets and antimalarial drugs
  • Dengue:
    • Viral disease caused by dengue virus
    • Spread by Aedes aegypti mosquitoes
    • Symptoms include high fever, severe headache, and joint pain
    • Can develop into life-threatening dengue hemorrhagic fever
    • No specific treatment, only symptom management
  • Chikungunya:
    • Viral disease caused by CHIKV virus
    • Also transmitted by Aedes mosquitoes
    • Symptoms include fever and severe joint pain
    • Rarely fatal but can cause chronic joint problems
    • Outbreaks occur in Africa, Asia, and the Americas
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