In COVID-19, a CRP level of ≥4 mg/L has been shown to be useful for triaging suspected cases when comparing polymerase chain reaction (PCR)-positive patients versus negative controls who have presented to a fever clinic with respiratory symptoms or a high temperature [odds ratio (OR) 4.75; 95% CI 3.28 to 6.88].5 The gene discussed is CRP; the disease is COVID-19.