Viral encephalitis is general a mosquito borne disease.
However there are several other viruses that may cause it including polio, herpes, measles, and chickenpox. Encephalitis may occur after various types of infection, too. Perhaps even sinus infection although this would be an exception as millions of people get sinus infection and very small numbers of people get encephalitis. Meningitis is very similar, but there are no brain function changes. A big clinical distinction.