TABLE 2.

Antigenic analysis of H5N1 influenza viruses from Hong Kong by the HI assay

VirusPolyclonal antisera HI titers to:Monoclonal antibody HI titers to:
Anti-A/HK/156 (483)/97 (sheep)Anti-A/Gs/HK/ 437-4/99 (chicken)Anti-A/Tern/ SA/61 (goat)Anti-A/Ck/HK/ YU22/02 (chicken)Anti-A/Gs/ HK/739.2/02 (duck)A/Ck/PA/1370/83A/Ck/PA/8125/83
CP24CP25CP46CP58176/26406/07
HK/156/971,280b5,12010,2401,2803201,6003,2006,4006,40012,80012,800
Ck/HK/258/971,2802,560160160a1,6001,600a6,40012,800400
Ck/HK/FY150/013201,280401604004001,6006,4006,4003,200
Ph/HK/FY155/011601,280808008008006,4003,2001,600
Ck/HK/822.2/011,2802,5601601,6002006,400200
Ck/HK/YU562/013201,2801608008008001,600100100
Ck/HK/873.3/011601,2801601,600800200800800
Ck/HK/31.4/026401,280160100100200100
Ck/HK/YU22/021,280320100100100
Ck/HK/86.3/02402,56016064080100
Teal/HK/2978.1/023201604080800400400800100
RB poch/HK/821/023204040
Gs/HK/739.3/0264016040100
Gs/HK/739.2/021,28032080400
Reference strains
    Tern/SA/61401,280160401,600200800
    Ck/PA/1370/83NDcNDNDNDND12,80012,8006,4003,2006,4006,400
    Gs/HK/437-4/99ND5,120NDNDNDNDNDNDNDNDND
  • a — titer, <1:40 for antisera and <1:100 for monoclonal antibodies.

  • b Underlined values are titers of homologous virus.

  • c ND, not determined.