Final answer:
The mode of transmission for arboviral encephalitis is vector-borne through mosquitoes.
Step-by-step explanation:
The mode of transmission for arboviral encephalitis is vector-borne.
Arboviral encephalitis is caused by arthropod-borne viruses, also known as arboviruses. These viruses are transmitted through a vector, which is an animal that carries and transmits the virus from one host to another. In the case of arboviral encephalitis, the primary vector is mosquitoes. Mosquitoes become infected with the virus by feeding on infected animals, such as birds, and then transmit the virus to humans through their bites.