Table 5.

HI profiles show antigenic differences among H9N2 wild-type and ferret-adapted strains

Ferret sera*/virusWF10RCP10RCP10 (A189, G192)RCP10 (T189, R192)
WF105120, 5120320, 640640, 6401280, 2560
RCP101280, 6405120, 51205120, 25601280, 640
RCP10 (A189, G192)1280, 6405120, 25605120, 51201280, 640
RCP10 (T189, R192)2560, 25601280, 640640, 12805120, 2560
M98<10, <10<10, <10<10, <10<10, <10
Dk/Y28080, 8080, 80ND§ND
Ch/SF3160, 160320, 640NDND
  • *Sera collected at 2 weeks p.i. was used in HI assays against homologous and heterologous viruses.

  • Dk/Y280 corresponds to influenza A/duck/Hong Kong/Y280/97 (H9N2).

  • Ch/SF3 corresponds to influenza A/chicken/Hong Kong/SF3/99 (H9N2).

  • §ND, not done.