EN
The aim of this study was to prove whether the viral interleukin 8 (vIL-8) expression patterns can be studied in vitro among different MDV-1 pathotypes. Minor expression fluctuations were found. The changes in the vIL-8 expression indicated common patterns for the vv+MDV strains as well as for vMDV JM and attenuated Rispens strain. The expression patterns of the two vvMDV strains (Md5 and 549A) were different. The studies presented have shown that the differences in vIL-8 expression, which are important for the cytolytic, productive infection of the cells, can be also investigated in vitro in CEF cultures, but the results should be confirmed by in vivo studies.