The different types are designated by the letters A, B and C.

不同的类型分别用字母A、B和C标明。

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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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The books' publisher, Bungeisha, says the series - one each for types b, o, a, and AB - has combined sales of well over 5 million copies.

书籍出版商Bungeisha说，该四套书籍——其中每种都分别包括B型、O型、A型和AB型——已经创造了超过500万份的销售数量。

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Hepatitis -- the most common types being hepatitis A, B and C -- refers to inflammation or viral infections of one's liver.

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Read said Pfizer's mid- to late-stage drug pipeline "continues to strengthen with key potential opportunities, " including drugs for advanced breast cancer and three other types of cancer, one for high cholesterol and a meningococcal B vaccine for adolescents and young adults.

WSJ: Pfizer Q4 net jumps on sale of nutrition business

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