We also investigated causes of nasal CXCL10 elevation in patients testing PCR negative for a panel of seasonal respiratory viruses in prior work, which identified unexpected viruses (e.g. SARS-CoV-2 at the start of the COVID-19 pandemic), primary EBV or CMV infection, and sepsis with cytokine storm as causes of high nasal CXCL10.19 The gene discussed is CXCL10; the disease is cytomegalovirus infection.