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[Preprint]. 2024 May 22:2023.10.02.23296453. Originally published 2023 Oct 3. [Version 2] doi: 10.1101/2023.10.02.23296453

Figure 7 – figure supplement 2. The effect of influenza A(H1N1) epidemic size on A(H3N2) epidemic burden during A. the entire study period (1997–2019), B. pre-2009 seasons, and C. post-2009 seasons.

Figure 7 – figure supplement 2.

Influenza A(H1N1) epidemic size negatively correlates with A(H3N2) epidemic size, peak incidence, transmissibility (maximum effective reproduction number, Rt), and epidemic intensity. Point color indicates the dominant influenza A virus (IAV) subtype based on CDC influenza season summary reports (red: A(H3N2), blue: A(H1N1), purple: A(H1N1)pdm09, orange: A(H3N2)/A(H1N1)pdm09 co-dominant), and vertical and horizontal bands are 95% confidence intervals of regional estimates. Seasonal mean A(H3N2) epidemic metrics were fit as a function of A(H1N1) epidemic size using Gaussian GLMs (epidemic size, peak incidence: inverse link; effective Rt: log link) or Beta GLMs (epidemic intensity: logit link) with 1000 bootstrap resamples.