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Phylogenetic analysis based on the 3C region. The nucleotide sequences of 3C region of Yunnan strains were compared with those of the CA24v strains from AHC outbreaks worldwide. In the unrooted tree obtained, Yunnan strains are indicated by black spots. Guangdong isolates were indicated by black triangle. The bootstrap values of at least 75% are shown at tree nodes. Every strain is indicated by GenBank accession number, strain code, country/region followed by year of isolation
