Table 1

Crossreactivity between H9N2 influenza viruses in hemagglutination inhibition tests

H9N2 viruses*Antibody titers with antisera to influenza viruses
Ty/WI/66 [R]Ty/MN/38391/95 [C]Sb/DE/9/96 [C]Qa/HK/G1/97 [C]Ck/HK/G9/97 [C]Dk/HK/Y280/97 [C]Ab/HK/M603/98 [C]
Ty/CA/189/66128012801280204020<
Ty/WI/66 320 6406402020<<
Gs/MN/5733/803201280≥25604080160<
Qa/AR/29209/93320640640204020<
Ty/MN/38391/95320 320 1280<4020<
Sb/DE/9/96160640 640 <2020<
Ck/Kor/006/961601280320204020<
Ck/Kor/323/9680640160<4020<
Ck/Bei/1/94803208040320320<
Qa/HK/G1/9780128080 1280 16080<
Ck/HK/G9/97640≥25601280320 ≥2560 >2560<
Ck/HK/G23/97320≥25606403202560 ≥2560 <
Pg/HK/Y233/97640≥256012801280≥2560>2560<
Dk/HK/Y280/97160128080801280640<
Dk/HK/Y439/97160640320204020<
Ab/HK/M603/98(H11N1)<<<<<< 320
  • * Virus abbreviation: animals: turkey, Ty; goose, Gs; quail, Qa; chicken, Ck; shorebird, SB; pigeon, Pg, aquatic bird, Ab. Place: Arkansas, AR; California, CA; Delaware, DE; Wisconsin, WI; Minnesota, MN; Beijing, Bei; Korea, Kor; Hong Kong, HK. [R] = hyperimmune rabbit antiserum, [C] = postinfection chicken antisera.