Figure 2 | Scientific Reports

Figure 2

From: Epidemiology and characterization of avian infectious bronchitis virus strains circulating in southern China during the period from 2013–2015

Figure 2

A phylogenetic tree was constructed based on the S1 gene from the 206 isolated field strains and 42 published reference strains using the neighbor-joining method and setting bootstrap 1000 replicates. The vaccine strains that are used in China are marked with ‘’. The Chinese reference strains are marked with ‘’. The foreign reference strains are marked with ‘’. Two variant strains that were the result of recombination were isolated and marked with ‘’. Unmarked strains are field strains isolated in this study.

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