Meanwhile, previous studies found several risk factors concerning the prognosis of hemodialysis patients with COVID-19: advanced age, decreased oxygen saturation, low diastolic blood pressure on admission, and complications, in Wuhan, China [31]; age > 70 years, longer dialysis vintage, higher CRP, and male sex, in Stockholm, Sweden [32]; older age, diabetes, local community COVID-19 rates, in London, UK [33]; and older age, heart disease, and markers of frailty, in the US [15]. The gene discussed is CRP; the disease is COVID-19.