Encephalitis is an acute inflammation of the brain, commonly caused by a viral infection. It can be caused by a bacterial infection such as bacterial meningitis, or may be a complication of other infectious diseases like rabies (viral) or syphilis (bacterial). Rabies is a viral zoonotic disease that causes acute encephalitis. There is a vaccine against it.
The disease is transmitted through the saliva and the blood. The usual form of getting is a bite of a rabid mammal. Pets, like dogs need to be vaccinated against it, in most countries.
Syphilis is a disease. It is one of the sexually transmitted diseases. This means it can be spread by having sex. Condoms can prevent it from spreading.
The disease is caused by a bacterium, called Treponema pallidum. Most transmissions occur through the sexual route. Very rarely, it can also be spread by direct contact, or from the mother to the child.
Treatment is usually symptomatic. Reliably tested specific antiviral agents are available only for a few viral agents (e.g. acyclovir for herpes simplex virus) and are used with limited success for most infection except herpes simplex encephalitis. In patients who are very sick, supportive treatment, such as mechanical ventilation, is equally important.
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What I mean is... Maybe there is something out there, I don't know, I don't want to give you false hopes, but maybe there is something that can help you about the disease.
You should look into the matter a little bit.