TBE Incidence in Different Age Groups
Every country reported TBE cases in children, the lowest incidence was found in small children less than three years of age. With increasing age, children showed higher incidences. The highest rate reported in children was in the Khabarovsk region in Russia, where 26% of TBE cases were in children aged 0–14 years. In Slovenia, children represented 23.5% of all confirmed TBE cases in the period of 1959 to 2000. In Austria, the 7- to 14-year-olds formerly were the age group with the greatest annual incidence of TBE (19% of all cases). At present, however, due to the Austrian vaccination program, and in particular the vaccination campaign in schools, children between 7 and 14 years are among the best protected age groups. In Austria, most cases of TBE now occur in older age groups. In Sweden about 10% of the patients are younger than 15 years.
Austria - a comparison of the TBE cases before and after the start of the national school vaccination campaigns.
The youngest patient known thus far was three months old; the oldest patient was 83 and died showing signs and symptoms of meningoencephalitis. As for TBE prevalence in the different age brackets, an increase with advancing age has been observed in TBE focal areas, although the prevalence in different endemic areas may vary.