Figure 1.

Boxplots illustrating the differences in amounts of nasal virus shedding between equine herpesvirus type 1 (EHV-1) variants (N/D₇₅₂) across all days and animals for each experiment. (a) Experiment on 14 horses (seven infected with the N₇₅₂ and seven infected with the D₇₅₂ variant) conducted by Goodman et al. [4]; (b) Experiment on nine horses (three infected with the N₇₅₂ and six infected with the D₇₅₂ variant) conducted by Van de Walle et al. [5]; (c) Experiment on eight ponies (four infected with the N₇₅₂ and four infected with the D₇₅₂ variant) conducted by Goodman et al. [4]. If sampling took place on a given day, then all infected animals were sampled, with the exception of day 23 in the experiment on horses conducted by Goodman et al. where samples were restricted to six individuals infected with the N₇₅₂ variant and four individuals infected with the D₇₅₂ variant. In each boxplot, the bottom and top of the box indicate the first and third quartiles, and the band inside the box indicates the median. Upper (and lower) whiskers extend to the highest (and lowest) value that is within 1.5 times the inter-quartile range (i.e., the distance between the first and third quartiles). Data points beyond the end of the whiskers are plotted as dots [10]. Due to highly skewed distributions, the amount of nasal virus shedding was plotted on a logarithmic scale.