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. 2016 May 10;12(5):e1005619. doi: 10.1371/journal.ppat.1005619

Fig 5. Selection bias intensified for HSX founder viruses compared to MSM founder viruses.

Fig 5

The transmission index of a sequence was calculated using logistic regression with model weights taken from [12]. Black lines represent the median transmission index for the two risk groups. The overall transmission index of HSX (red circles) viruses is significantly higher than from MSM (blue circles) founder viruses (P = 0.00003, Mann-Whitney two-tailed test). The number of subjects in each category is denoted under each group.