The reason it's not talked about
much is because there is no known treatments for it, but it is a Flavivirus - which can cause some pretty nasty infections.
There's really not a lot of information on these viruses, but here is a link to the only site I know has at least mostly accurate information:
columbia-lyme.org/patients/tbd_encephalitis.html and some links to posts on this forum:
/goo.gl/Bg26UP