有三种类型的季节性流感——甲型、乙型和丙型。根据病毒表面蛋白不同的种类和结合情况，甲型流感病毒又进一步分类为亚型。
There are three types of seasonal influenza – A, B and C. Type A influenza viruses are further typed into subtypes according to different kinds and combinations of virus surface proteins.
第二个风险，或人们更忧虑的是，病毒如果有足够的机会，可能将变异为对人类更具传染性的类型，在人与人之间迅速传播。
A second risk, of even greater concern, is that the virus - if given enough opportunities - will change into a form that is highly infectious for humans and spreads easily from person to person.
提示EB病毒原位杂交表达与NPC的组织学类型关系密切，角化型为阴性表达，非角化型为阳性表达。
The results suggested that the expression of EBV was closely correlated to the histological type of NPC:keratinizing NPC was negative, while non keratinizing NPC was positive.
提示EB病毒原位杂交表达与NPC的组织学类型关系密切，角化型为阴性表达，非角化型为阳性表达。
The results suggested that the expression of EBV was closely correlated to the histological type of NPC:keratinizing NPC was negative, while non keratinizing NPC was positive.
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