Plasma levels of IL‐1β were low overall, with no significant differences between the patients with bacteremia (highest median level was found on day 7; 1.7 pg/ml; range 0.1–11.4 pg/ml) and the controls (median 1.6 pg/ml; range 0.8–4.2 pg/ml). The gene discussed is IL1B; the disease is bacterial infectious disease with sepsis.