PBMC proliferative kinetics to Nm but not influenza are delayed in patients with X-HIM. X-HIM PBMC (0.6 × 10⁶/mL) were stimulated with Nm OMVs (H44/76, TR4, TR10, PorA⁻ 1 μg/mL) and influenza antigens (90 ng/mL). Proliferation was assessed by tritiated-thymidine (³HTdR) incorporation during days 3 to 9 of culture. Results are expressed as the mean number of triplicate corrected counts per minute (ccpm). The standard error of the mean cell counts was always less than 10% of the mean value shown.