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Phylogenetic trees showing B2 strains collected in the DR-Congo (December 2004 to February 2006). The calculation was based on (a) the 450 nt of the NP-HVR, (b) the 3,377 nt of the P/H pseudogene, (c) the 1,524 nt of the P gene, and (d) the 1,854 nt of the H gene. ●, WHO reference strain. Genetic distances are represented as the number of nucleotides of difference between strains.
