In one word the hemagglutinins of h9 subtype avian influenza virus strains in mainland china reflect the geographical paramenters in one way 该理论体系的形成，为今后对禽流感的预报预测奠定了理论基础，提供了理论依据。
2.
The hemagglutinins of 30 h9 subtype avian influenza viruses ( aivs ) isolates from the domestic chickens among different geographical areas in mainland china during the period of 1994 to 2001 were analyzed antigenically and genetically 本研究对1994年- 2001年，分离自中国大陆的30株h9n2亚型禽流感病毒的不同分离株，进行了抗原交互性测定及其血凝素基因的序列分析。
3.
Hemagglutinins inhibition ( hi ) testes showed that there were obvious variations among the isolates from different geographical areas . this result explained why the protection rates of current vaccine were different around the country . dna sequence analysis of h9 hemagglutinin genes showed that these viruses were closely related and possibly came from one source 且在同一地域内，不同的异变体之间的差异较小，随着时间的推移，其变异并不明显；但在不同的区域内分离的毒株之间变异较为突出，这表明中国大陆h9n2亚型禽流感病毒不同分离株抗原性是与地域的改变而发生较为明显的变异。
