Our observations with that respect are fragmentary: in three patients in whom peripheral blood lymphocyte CCR5 was measured in the first phase of the infection and who later developed meningitis, it was within the range of values found in other groups, as it was in three patients with a mild flu-like infection without cns involvement, not giving evidence for any inter-group variability or dynamical change of CCR5 expression before the cns invasion. Here, CCR5 is linked to infectious meningitis.