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Once there has been clinical resolution of the infection with no lasting neurological deficit the remaining risk is the development of epilepsy.  Aseptic viral meningitis carries no significant risk, bacterial (pyogenic) meningitis a small increase, viral encephalitis a moderate risk and cerebral abscess a high risk.

Condition Class 1  Class 2
 Aseptic viral meningitis Unrestricted after 6 months   Unrestricted after 6 months
 Bacterial meningitis
   - Without seizure
   - With seizure (in acute phase) 
Unrestricted after 12 months 
OML after 2 years & unrestricted after 5 years  
 Unrestricted after 12 months
 Unrestricted after 2 years

 Viral Encephalitis
   - Without seizure
   - With seizure (in acute phase) 

OML after 18 months & unrestricted after 5 years 
OML after 3 years & unrestricted not possible 
 Unrestricted after 18 months
 Unrestricted after 3 years
 Cerebral abscess Not possible   Not possible