In the COVID-19/EBV subgroup, no significant association was observed between the duration of hospitalization and biological markers, including CRP (p = 0.06), ESR (p = 0.059), ferritin (p = 0.633), procalcitonin (p = 0.947), D-dimers (p = 0.212), Na (p = 0.220), and vitamin D (p = 0.796). This evidence concerns the gene CRP and COVID-19.