Patients with co-infections or secondary infections had higher levels of white blood cells, neutrophils, blood urea nitrogen, lactate dehydrogenase, serum ferritin, Krebs-von-den-Lungen-6, C-reactive protein, and procalcitonin (all P < 0.0001) than COVID-19 patients without bacterial infections. The gene discussed is CRP; the disease is COVID-19.