Development of vaccine strains of H5 and H7 influenza viruses.
To establish vaccine strains of H5 and H7 influenza viruses, A/duck/Hokkaido/Vac-1/04 (H5N1) [Vac-1/04 (H5N1)], A/duck/Hokkaido/Vac-3/07 (H5N1) [Vac-3/07 (H5N1)], and A/duck/Hokkaido/ Vac-2/04 (H7N7) [Vac-2/04 (H7N7)] were generated from non-pathogenic avian influenza viruses isolated from migratory ducks. Vac-1/04 (H5N1) and Vac-3/07 (H5N1) were generated by genetic reassortment between H5N2 or H5N3 virus as an HA gene provider and H7N1 or H6N1 viruses as an NA gene provider. Vac-2/04 (H7N7) was a genetic reassortant obtained using H7N7 and H9 N2 viruses to give high growth character of the H9N2 virus in chicken embryonated eggs. The results of sequence analyses and experimental infections revealed that these H5N1 and H7N7 reassortant viruses were non-pathogenic in chickens and embryos, and had good growth potential in embryonated eggs. These viruses should be useful to develop vaccines against H5 and H7 highly pathogenic avian influenza viruses.
Soda
Kosuke
K
Laboratory of Microbiology, Department of Disease Control, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo, 060-0818, Japan.
Sakoda
Yoshihiro
Y
Isoda
Norikazu
N
Kajihara
Masahiro
M
Haraguchi
Yoshinari
Y
Shibuya
Hitomi
H
Yoshida
Hiromi
H
Sasaki
Takashi
T
Sakamoto
Ryuichi
R
Saijo
Kazue
K
Hagiwara
Junko
J
Kida
Hiroshi
H
D000818:Animals; D001717:Birds; D004279:DNA, Viral / Q000235:genetics; D005814:Genes, Viral; D006801:Humans; D053124:Influenza A Virus, H5N1 Subtype; D053125:Influenza A Virus, H5N2 Subtype; D053126:Influenza A Virus, H7N7 Subtype; D009980:Influenza A virus / Q000276:immunology*; D007252:Influenza Vaccines / Q000235:genetics* / Q000276:immunology*; D005585:Influenza in Birds / Q000276:immunology / Q000517:prevention & control*; D007251:Influenza, Human / Q000276:immunology / Q000517:prevention & control*
D004279:DNA, Viral; D007252:Influenza Vaccines