Post-Vaccinial
Encephalitis: Frequency &
Susceptible Populations
Data
from the 1968 U.S. study of vaccine complications reveals
that all such cases followed primary vaccination, the
highest rates being observed in children under the age
of one year:
Post-Vaccinial Encephalitis
Frequencies
(1968 US Survey)
Ages in Years
# per million
primary vaccinees
< 1
6
1-4
2
5-19
3
20+
4
European
data indicate a higher incidence than in the U.S., but
whether this reflects the use of different vaccine strains
or differences in diagnostic methods is unknown. There
are no known predictive antecedents.
