Although DNA analysis techniques such as polymerase chain reaction can be used to look for DNA of herpesviruses in spinal fluid or blood, the results may be negative, even in cases where other definitive symptoms exist.
Herpesviral meningitis
Fungal meningitis
Herpesviral encephalitis
Viral meningitis
Eastern equine encephalitis
Aseptic meningitis
Tick-borne encephalitis
Japanese encephalitis