Figure 5. PCoA showing the spatial dispersion of the samples. Distance matrix was constructed based on Bray–Curtis metric.

Coordinate plots represent (A) Study; the study of Varmuzova et al. (2015) was split due to the high intra-study variation obtained. Varmuzova_2015 = Control Chickens and uninfected Chickens treated with the plant extracts; Varmuzova_2015_I = Infected chickens; Varmuzova_2015_P_I = Infected chickens, treated with the plant extracts. (B) Hypervariable region of the 16S rRNA gene. (C) Type of chickens (commercial, experimental), when commercial chickens refer to animals raised on normal production environments and experimental refers to animals that were kept into environments with controlled conditions. (D) Breed of the animals, where Broiler corresponds to all fattening breeds that are not specified.