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Encephalitis or meningoencephalitis following vaccination has been reported among vaccinees in the U.S. and from many other countries, but how many such cases are coincidental in time and how many are related to the vaccination itself is impossible to know. A number of different infectious agents and non-infectious processes can be responsible and it is often impossible to establish the etiology.
In general, this is a severe disease with high mortality and morbidity.
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