Awkward because encephalitis is caused by HIV.
From the NHS website:
Encephalitis is most often due to a virus, such as:
- herpes simplex viruses, which cause cold sores (this is the most common cause of encephalitis)
- the varicella zoster virus, which causes chickenpox and shingles
- measles, mumps and rubella viruses
- viruses spread by animals, such as tick-borne encephalitis, Japanese encephalitis, rabies (and possibly Zika virus)
Encephalitis caused by a virus is known as "viral encephalitis". In rare cases, encephalitis is caused by bacteria, fungi or parasites.