Figure 4.

Phylogenetic analyses of sequences of the Beijing rubella viruses based on the World Health Organization (WHO) standard sequence window. (a) Phylogenetic analysis of 64 Beijing rubella virus sequences in 2007–2011 compared with 32 WHO reference sequences. The symbols with different colors represent rubella viruses isolated in different years. The 16 rubella viruses in red were selected for further molecular epidemiological analysis. (b) Phylogenetic analysis of 16 representative Beijing genotype 1E rubella virus strains compared with 57 genotype 1E rubella viruses from the other provinces of China in 2001–2009 and 22 viruses from 16 other countries. The genotype 1E rubella virus sequences other than Beijing were obtained from the GenBank database. The Chinese vaccine strain BRD II was used as an outgroup.