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Phylogenetic analysis of sequences of 53 representative Chinese rubella viruses from 2008 to 2009 compared to the WHO reference sequences based on the WHO standard sequence window within the E1 gene (nt 8731 to 9469). Numbers in parentheses are the numbers of identical or similar sequences found in the same outbreak. The genotype 1E rubella viruses isolated during 2008 and 2009 are indicated by solid triangles.
