A Korean study of 436 adult COVID-19 patients, of whom 35 had influenza co-infection and 401 were infected with SARS-CoV-2 only, found that co-infected patients were hospitalized more often (85.7% versus 6.7%; p-value < 0.001) and had significantly higher inflammatory markers (C-reactive protein [CRP], procalcitonin, and lactate dehydrogenase (LDH); p-values = 0.019, <0.001, and 0.024) but significantly lower lymphocyte counts [p-value = 0.003] [67]. This evidence concerns the gene CRP and influenza.