CD11b, ICAM-1, and CD69 expression on innate immune cells after infection of blood cells by TBEV strains. The whole-blood samples were mock-infected and infected with TBEV strains (P-183 and Dal) at a MOI of 0.01 TCID50/cell and analyzed at 24 h p.i. by flow cytometry for expression of CD11b, ICAM-1, and CD69 on the surface of monocytes, granulocytes, and NK cells. The results shown were obtained from 10 independent blood samples and are presented as mean fluorescence intensity (MFI; each data point represents the mean±SD). Asterisks (*) indicate the differences between parameters of TBEV-infected and mock-infected cells that were statistically significant (p≤0.05).