Supplementary Materials

The PDF file includes:

  • Figure S1. Excess ILI for each US state.
  • Figure S2. Excess ILI correlates strongly with patterns of newly confirmed COVID-19 cases.
  • Figure S3. Surveillance data from New York City emergency departments.
  • Figure S4: Prevalence of SARS-CoV-2 infections between March 8 and March 28, 2020.
  • Figure S5. Syndromic case detection rates by state.
  • Figure S6: Estimating the infection fatality rate (IFR) of COVID-19 based on the unadjusted ILI surge.
  • Figure S7: Investigating model sensitivity when ILI is modeled without first removing signal from influenza.
  • Figure S8. Investigating model sensitivity when seasonal trends in non-influenza ILI are identified using an alternative statistical model.

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