What should you do when after valve replacement encephalitis is present?

Endocarditis?: Most of the time, the problem with a valve is "endocarditis" not encephalitis. Endocarditis is an infection of the valve and can lead to loss of valve function. If a prosthetic valve gets endocarditis, replacement of that valve is often necessary.

Antibiotics: Endocarditis is the infection of a valve or artificial valve. Cultures to determine cause of infection and appropriate antibiotics for six weeks is common.

Replace the valve: You are likely indicating a shunt infection. Treatment include removing the shunt an treatment with antibiotics.