HI
Thanks for posting your query to Healthcaremagic.
Fever and painful
lymph nodes indicates Infection . Infection could be either Viral or bacterial infection . But the symptoms of Slurred Speech points the problem towards the problem .
The brain problem could be related to the infection or it could be an independent problem. The possibilities are :
1. Improper Blood supply to certain areas of brain.
2. Bleeding inside the brain.
3. Spread of infection to the brain .
It requires certain investigations and Brain scanning to know the cause of the problem. I advise you to admit him to a hospital and take a
Neurologist consult.
He shall require these tests :
MRI Brain , Complete Hemogram, Mono test, IgM Typhi Dot ,
Serum Creatinine , Serum Electrolytes , CSF analysis.
Do let me know what does these reports show .
Hope this information was useful to you.
Any clarifications feel free to ask .