the retrospective study, vaccination data on 535,544 children, ages
1-7, vaccinated between November 1982 and June 1986 in Finland were
linked individually with data from a nationwide hospital discharge register
for hospitalizations for encephalitis, aseptic meningitis, and autism.1
showed no significant increase in hospitalizations for encephalitis
or aseptic meningitis within 3 months postvaccination with MMR (p=0.28
and 0.57, respectively).
showed no significant clustering of hospitalizations for autism after
showed a decrease in encephalitis and aseptic meningitis of unspecified
cause in study period suggesting a protective effect of the MMR vaccine.