When we compared CCL5 expression between TBE, neuroborreliosis, and other aseptic meningitis patients, the differences between these groups were analogous to the trends observed for CCR5 expression: in TBE, the initial CCL5 concentration was low in comparison with neuroborreliosis, but its increase was characteristically protracted into the convalescent phase. This evidence concerns the gene CCR5 and aseptic meningitis.