Compared to COVID-19 patients, influenza pneumonia patients had higher temperatures (p < 0.001), WBC counts (p < 0.001), neutrophil counts (p < 0.001), neutrophil rates (p = 0.017), and CRP levels (p = 0.033), and lower lymphocyte rates (p = 0.005), which were also confirmed by multiple tests. Here, CRP is linked to COVID-19.