Thanks for seeking our advice in iCliniq. I appreciate your concern for your friend.
1. Fever with vertigo
may result from infection in the innermost part of the ear(s), which- along with cerebellum- the posterior part of the brain) is responsible for maintaining balance. But, at the same time, the term vertigo is usually used for episodic giddiness/dizziness
. As your friend's oral intake was very poor, starvation/dehydration
can be the cause of giddiness.
2. I also agree with you that there are several viruses which can affect the brain. The treating doctor should tap a little amount of fluid from the spinal cord
and send the same for analysis. CT/MRI scan of brain should also be done to exclude/confirm presence of any brain lesion. Once the culprit organism/virus is isolated, appropriate treatment can be started by the treating doctor.
Please revert back to me in case of further clarifications, if any
Have a nice day.