Which of the following statements is true regarding Arbo-viruses?
Discussing options one by one: Option-1 - False - Yellow fever is not present in India. Option-2 - True - Kyasanur forest disease is transmitted by ticks. In india: hard tick. Outside India: soft ticks. Option-3 - Flase - Aedes aegypti mosquito is the vector of dengue fever; Culex is vector of JE. Option- 4 - False - Dengue virus has four serotypes. There is no lifelong immunity against dengue.