Two different strains within a single subtype, two different influenza A subtypes(H1N1 and H3N2), or both influenza A and B viruses may cocirculate.

单一亚型内的两个不同菌种之间，A型流感病毒的两个不同亚型（H1N1和H3N2）之间，以及A型流感病毒和B型流感病毒之间均可以互相转染。

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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.

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。

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This year’s seasonal vaccine contains three influenza viruses — one A (H3N2) virus, one regular seasonal A (H1N1) virus unrelated to the swine flu strain and one B virus.

今年的季节流感疫苗含有三种流感病毒——一种甲型（H3N2）病毒，一种与猪流感毒株无关的常规季节性甲型（H1N1）病毒，以及一种乙型病毒。

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Tamiflu is one which is widely prescribed by many physicians and has efficacy against Influenza A and B.

FORBES: 2013 Flu Season: How to Protect Yourself

This year's North American vaccine is made from three viruses: two types of influenza A virus (H3N2 and H1N1) and an influenza B virus.

CNN: Had a flu shot? You'll be OK -- maybe

Tests in mice showed it works against both A and B influenza types and known resistant flu strains and researchers are now doing tests in other animals.

BBC: Flu drug 'shows promise' in overcoming resistance