​Selected human diseases and their vectors are listed below:

Column X		Column Y
Disease		Vector
A.	Chikungunya	i.	Aedos mosquito
B.	Lyme disease	ii.	Anopheles mosquito
C.	Lymphatic filariasis	iii.	Aquatic snails
D.	Schistosomiasis	iv.	Ticks

Which one of the following options represents the correct match between Column X and Column Y?

Correct option is D

​Explanation:

1. Chikungunya → Aedes mosquito (i)
• Chikungunya virus is transmitted by Aedes aegypti and Aedes albopictus mosquitoes.
• These mosquitoes are also responsible for Dengue and Zika virus transmission.
2. Lyme disease → Ticks (iv)
• Lyme disease is caused by the bacterium Borrelia burgdorferi and is transmitted by Ixodes ticks (Black-legged ticks or Deer ticks).
• It is common in North America and Europe.
3. Lymphatic filariasis → Anopheles mosquito (ii)
• Lymphatic filariasis (commonly known as elephantiasis) is caused by filarial parasites (Wuchereria bancrofti, Brugia malayi).
• It is transmitted by Anopheles mosquitoes (in Africa and India) and Culex mosquitoes (in urban areas).
4. Schistosomiasis → Aquatic snails (iii)
• Schistosomiasis (Bilharzia) is caused by Schistosoma parasites.
• The larvae are released from aquatic snails into freshwater, where they infect humans who come in contact with contaminated water.

Information Booster:

• Mosquito-borne diseases: Dengue, Malaria, Chikungunya, Filariasis, Yellow Fever, Zika Virus.
• Tick-borne diseases: Lyme disease, Rocky Mountain spotted fever, Tularemia.
• Snail-borne diseases: Schistosomiasis, Fascioliasis (Liver Fluke disease).
• Aedes mosquitoes: Active during the day, breed in clean stagnant water.
• Anopheles mosquitoes: Active at night, vector for malaria and filariasis.
• Ixodes ticks: Can also transmit Babesiosis and Anaplasmosis.