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. 2016 Sep;97(9):2255–2264. doi: 10.1099/jgv.0.000533

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© 2016 The Authors

This is an open access article under the terms of the Creative Commons Attribution 4.0 International License, which permits unrestricted use, distribution and reproduction in any medium, provided the original author and source are credited.

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Fig. 3. — Comparison of norovirus seroprevalence (n=649) stratified to cohort and genotype (a). Age-related broadening of the norovirus immune response (n=649) (b). Comparison of norovirus seroprevalence in sera (n=157) with single response stratified to cohort and genotype (c). Error bars indicate binomial proportion confidence intervals (Wilson score interval). Brackets above bars show significance level as determined by chi-squared test for trend. No bracket = P>0.05, *P≤0.05, **P≤0.01, ***P≤0.001 and ****P≤0.0001.