*2.2. Plasma Levels of TNF and IL-6*

The plasma levels of both pro-inflammatory cytokines greatly varied from 0 to 58 pg/mL and from 0 to 100 pg/mL for TNF and IL-6, respectively. No significant difference in the plasma levels for TNF or IL-6 was determined when the HHV-7 PCR+ and HHV-7 PCR− groups were compared. Plots representing the distributions of IL-6 and TNF cytokine plasma levels found in OA patients of both study groups, consisting of HHV-7 PCR+ and HHV-7 PCR−, can be seen in Figure 2.
