| prevalence of tick-borne encephalitis virus in ixodes ricinus ticks in finland. | approximately 20 cases of tick-borne encephalitis (tbe) occur annually in finland. the known endemic areas are situated mainly in the archipelago and coastal regions of finland, with highest incidence in aland islands. ixodes ricinus panels collected in 1996-1997 from two endemic areas were screened for the presence of rna. two distinct rt-pcr methods were applied, and were shown to have an approximate detection limit of 10 focus forming doses (ffd)/100 microl. one out of 20 pools (a total of 13 ... | 2001 | 11285564 |