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. 2021 Sep 7;9(4):cnab026. doi: 10.1093/comnet/cnab026

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© The authors 2021. Published by Oxford University Press. All rights reserved.

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Fig. 3. — Visualizations for the overall COVID-19 transmission patterns detected in the empirical data. (a) The contour plot is based on a referee-referral matrix. Individuals (referees and referrals) are arranged by their age. Colours in the plot illustrate the frequency of referee–referral nominations by age. Marginal histograms display age distributions for both referees and referrals (dark-red and red, respectively). (b) The bar plots show the frequency of referee-referral nominations by sex categories (females are indicated by green while males are indicated by red). Arrows designate who nominates whom as a disease origin. Moreover, it is illustrated the frequency of cases wherein the referral is female (male), irrespective of the referee’s sex (male, female or unknown). (c) The bar plots indicate the distribution of various types of pairs in the dataset. We also use three shapes to designate individuals embedded in the transmission dyads: triangles (referees), circles (referrals), and squares (brokers).