CST3 and infectious meningitis: Salivary cystatin C concentrations were significantly higher in pigs with meningitis caused by S. suis (median = 0.76 mg/L; IQR = 0.5–1.08) compared with healthy pigs (median = 0.51 mg/L; IQR = 0.41–0.62) (p = 0.01) (Figure 5).