[Viremia in patients with tick-borne encephalitis and in persons with attached ixodes ticks].

An original method of virus isolation developed by the authors made it possible to collect 64 strains of tick-borne encephalitis (TBE) virus isolated from the blood of TBE patients and subjects complaining of sucking Ixodidae ticks. It is demonstrated that only a small part of the tick natural population cause acute TBE. The majority of the strains (54 isolates) of TBE virus have been isolated from the blood of clinically healthy subjects. Half of the strains showed no immunogenic properties in human body. Season infectivity corresponds to monthly virusophority of the ticks.