Progress and Challenges toward the Development of Vaccines against Avian Infectious Bronchitis

Figure 2

Neighbour-joining phylogenetics showing relationship in S1-glycoprotein of classical (pink) and variant (blue) IBV strains. The tree reliability was assessed using 1000-bootstrap confidence and branching pattern is supported by 91.7–100% bootstraps values and associated taxa show 82% pairwise identity. Phylogenetic analysis was carried out using Geneious software version R8.