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Volume 10, Number 12—December 2004

Research

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§Comments to Author 
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

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Table 1

Replication of turkey isolates and swine influenza viruses in various animalsa

Animal Isolate
A/Tk/MN/764/03
A/Tk/NC/16108/03
A/Sw/TX/4199-2/98
A/Sw/NC/29974/02
Positive/totalb log10 EID50c Positive/totalb log10 EID50c Positive/totalb log10 EID50c Positive/totalb log10 EID50c
Mouse 6/6 4.3 (0.3) 6/6 4.7 (0.3) 6/6 5.3 (0.3) 6/6 5.0 (0.5)
Swine 2/2 2.7 (0.3) 2/2 3.3 (0.3) 2/2 3.7 (0.3) NT NT
Turkey 5/5 2.3 (0.3) 3/4 2.3 (0.3) 0/5 1/4 1.3 (0.0)
Quail 5/6 3.0 (0.5) 4/6 3.3 (0.5) 0/6 0/6
Chicken 0/6 0/6 0/6 0/6

a NT, not tested; −; negative
bNumber of animals with a virus-positive lung homogenate (mice) or nasal swab at 3 days postinfection per number of animals infected.
cAverage log10 EID50 per milliliter of homogenate (standard deviation).

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