CRP and bacterial infectious disease: As shown in Table 2, CRP concentration was <10 mg/L in no single case of invasive bacterial infection, but PCT values were <0.1, <0.25 and <0.5 μg/L (see rationale for these cutoffs under Methods) in two, three and three such cases respectively (0.03, 0.09 and 0.23 μg/L).