Concentrations of IL-1β were 2.26 (2.20–2.50) pg/ml in plasma and 2.40 (2.23–2.68) pg/ml in PF in the group negative for sepsis, 2.20 (1.60–2.20) pg/ml in plasma and 2.45 (1.68–2.57) pg/ml in PF in the questionable group, and 2.29 (2.20–2.34) pg/ml in plasma and 2.59 (2.42–2.95) pg/ml in PF in horses tested positive for sepsis. Here, IL1B is linked to Sepsis.