Table 2.

Amounts of GCP and PFU per 100 LD₅₀ of different TBEV samples.

TBEV Strain	Passage History *	LD50	PFU	GCP
	Far Eastern Subtype
Sofjin KGG	P1M2	100	130,000	350,000
	Siberian Subtype
Vasilchenko	хМ2V1	100	5,000	60,000
EK-328	М6P1М4		100	1000
	European Subtype
Absettarov	Mx	100	10,000	1,000,000

* M—mouse brain passage (Mx—unidentified number of early passages before the virus was obtained by the laboratory); P—passage in PEK cell culture, V—passage in Vero cell culture.