TABLE 1.

Antigenic characterization of H1N1 influenza viruses isolated from pigs

VirusbSubtypeHI titers of virus strain hyperimmune rabbit sera against contemporary H1N1 isolatesa
Sw/BJ/21/08Sw/FJ/204/07Dk/HB/843/05Sw/GD/1/05
Sw/FJ/204/07H1N11,280 1,280 64010
Sw/FJ/58/08H1N11,2801,280640<
Sw/SD/62/08H1N11,2801,280640<
Sw/BJ/21/08H1N1 1,280 1,280640<
Sw/BJ/26/08H1N11,2801,280640<
Sw/SD/443/08H1N11,2801,280640<
Sw/SD/128/08H1N11,2801,280640<
Sw/SD/1012/08H1N11,2801,280640<
Sw/SD/187/08H1N11,2801,280640<
Sw/SD/692/08H1N11,2801,280640<
Sw/GD/1/05H1N1320320320 5,120
Dk/HB/843/05H1N2<< 2,560 <
  • a <, HI titer of less than 10; boldfaced titers, HI titers for homologous H1N1 strains.

  • b Abbreviations: Sw, swine; Dk, duck; BJ, Beijing; SD, Shandong; GD, Guangdong; HB, Hebei; FJ, Fujian.