Figure 2. Phylogenetic analysis of the sequences of the hemagglutinin genes of the strains of measles virus from Menglian County, Yunnan Province, People’s Republic of China. The unrooted tree shows sequences from the Menglian viruses (circles) compared with World Health Organization reference strains for each genotype. Genotype designation is in boldface. MVi, measles virus sequence from isolates; MV, measles virus; MVs, measles virus sequence from clinical specimens; wt, wild type. Scale bar indicates base substitutions per site.