"Tick borne encephalitis (TBE) is a serious
acute central nervous system infection,
which may result in death or long term neurological sequelae in 35-58% of patients.
The fatality rate associated with
clinical infection is 0.5-20%."

WHO, State of the Art of New Vaccines: Research & Development 2003
http://www.who.int/vaccine_research/diseases/vector/en/index2.html
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