FIG 1.

Tracheal thickness measurements (A) and tracheal lesion scores (B) for chickens monoinfected and coinfected with M. gallisepticum and LPAIV H3N8. Statistically significant differences among group tracheal lesion scores were calculated using Kruskal-Wallis ANOVA on ranks with Dunn’s post hoc test. Statistically significant differences among group tracheal thickness measurements were calculated using one-way ANOVA with Tukey’s post hoc test. Significant (P < 0.05) differences between groups are denoted using a and b.