FIG 1.
Relationship of the SerotypeFinder database wzx and wzy gene variants. The key genes used in the in silico O typing (wzx [A] and wzy [B]) were visualized by neighbor-joining trees, constructed using percent ID. O types represented by more variants are highlighted. The wzx and wzy variants clustered according to O types. One O45 antigen gene cluster sequence is known to differ from that of other O45 gene cluster sequences and has been proposed to have been acquired from other Enterobacteriaceae (36).