H3N2 Influenza Virus Transmission from Swine to Turkeys, United States
Young K. Choi*, Jee H. Lee†, Gene Erickson‡, Sagar M. Goyal†, Han S. Joo†, Robert G. Webster§, and Richard J. Webby§
Author affiliations: *Chungbuk National University, Cheongju, Republic of Korea; †University of Minnesota, St. Paul, Minnesota, USA; ‡North Carolina Department of Agriculture and Consumer Services, Raleigh, North Carolina, USA; §St. Jude Children’s Research Hospital, Memphis, Tennessee, USA
Figure. Phylogenetic tree representing the HA nucleotide sequences of two H3N2 influenza viruses isolated from turkeys on geographically distant farms in the United States and of selected swine influenza virus strains. Nucleotide sequences were aligned by using the Clustal_X (19) program, and phylograms were generated by the neighbor-joining method using the NJplot program (20). The scale is proportional to the numbers of substitutions per nucleotide.
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