Q.40
Which of the following(s) is/are true for "Japanese encephalitis"?
(A). Itis transmitted by Haemaphysalis spinigera tick.
(B). Pigs are the amplifier hosts in its life cycle
(C). Human is the dead-end host
(D). Horses are the dead-end hosts.
Choose the correct answer from the options given below:
- Japanese Encephalitis Virus (JEV, Flaviviridae):
- Vector: Transmitted primarily by zoophilic mosquitoes belonging to the genus Culex (Culex tritaeniorhynchus, C. vishnui), which breed in flooded rice paddies. (Tick transmission by Haemaphysalis is characteristic of Kyasanur Forest Disease, not JE; Statement A is False).
- Amplifier Hosts (B): Pigs develop high-titer viremia without clinical illness, serving as the essential amplifying host that multiplies the virus in agricultural communities.
- Dead-End Hosts (C & D): Humans and Horses develop clinical encephalitis with transient, low-titer viremia that is insufficient to infect feeding mosquitoes, terminating the transmission chain.
- nalysis:
- Statements (B), (C), and (D) are true. Hence, Option 2 is correct.
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