We also validated the probes against the SARS-CoV-2 S gene and human ACE2 gene on autopsy lung tissue collected from an influenza A (H1N1) infected patient before the COVID-19 pandemic, showing no signal for SARS-CoV-2 S gene and prominent signal for ACE2 ( Supplementary Figure S1F). The gene discussed is ACE2; the disease is influenza.