post-vaccinal encephalitis https://www.malacards.org/card/post_vaccinal_encephalitis encephalitis following immunization procedures ICD9:323.51 MONDO:0001773 UMLS:C0751101 encephalitis following immunisation procedures An acute or subacute inflammatory process of the central nervous system characterized histologically by multiple foci of perivascular demyelination. Symptom onset usually occurs several days after an acute viral infection or immunization, but it may coincide with the onset of infection or rarely no antecedent event can be identified. Clinical manifestations include confusion, somnolence, fever, nuchal rigidity, and involuntary movements. The illness may progress to coma and eventually be fatal. (Adams et al., Principles of Neurology, 6th ed, p921) GARD:0023010 SCTID:31367003 MEDGEN:152946 DOID:13664 encephalitis