PPBP and systemic inflammatory response syndrome: Another platelet activation marker CXCL7 with a concentration of <95.05 pg/mL showed a sensitivity of 81.25% and specificity of 75% to distinguish sepsis compared to other causes of SIRS (AUC = 0.912, p = 0.006), but it could not differentiate between SBI and other causes or viral versus all bacterial (Table 4).