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. 2018 May 12;218(7):1054–1060. doi: 10.1093/infdis/jiy291

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Figure 3. — Estimations of overall population-level immunity against H2 viruses and the potential impact of population immunity on reproduction number, using 3 potential titer cutoffs for 100% immunity. Bars represent the 95% confidence intervals of the estimates. Data are shown from S57 A/Singapore/1/57, B68 A/Berkeley/1/68, M727 A/mallard/England/727/06, M14 A/mallard/Netherlands/14/07, Hong Kong, and Rochester, New York. Abbreviations: H, Hong Kong; R, Rochester, New York; R₀, basic reproduction number.