IL6 and COVID-19: Although IL-6 is elevated in the serum of patients with severe COVID-19 (Cummings et al., 2020), there was no significant inflammatory cytokine/chemokine induction by SARS-CoV-2 in our in vitro models (Supplementary Figure S3G), whereas in separate experiments increased cytokine levels were induced in cells exposed to rhinovirus (Supplementary Figure S3I) or Poly I:C (Supplementary Figure S3H).