Experiencing cold symptoms with a PCR-positive viral infection (S+/V+) was associated with increased CXCL10 levels compared to S+/V- cases (Kruskal-Wallis test with Dunn's multiple comparison, p < 0.0001) and S-/V- cases (Kruskal-Wallis test with Dunn's multiple comparison, p = 0.0001) (Figure 3C). Here, CXCL10 is linked to viral infectious disease.