Marker stability of the Skalica strain (from the tick-borne encephalitis complex) propagated in Ixodes ricinus ticks.

Ixodes ricinus larvae from the laboratory breed were infected on viraemic suckling mice inoculated with the Skalica strain from the tick-borne encephalitis complex. The strain recovered from individual nymphs on days 39 and 54 after metamorphosis had the markers (ic+, sc-, t-, v-) identical with the original Skalica strain.