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H1N1 is the name of a flu virus. The one people remember is the “swine flu” that went around the world in 2009 — though actually viruses with this same name have been around much longer, and pigs, birds, and people can all carry versions of it. Scientists name flu viruses by two proteins on the outside: H for hemagglutinin and N for neuraminidase. H1N1 means type 1 of each. In everyday talk, families often say swine flu and mean the 2009 outbreak; doctors and headlines more often say the letters. H1N1 is the virus; swine flu is the illness people talk about.
H1N1、豬流感（台灣2009年也常說「新流感」；中國大陸較常說「甲型H1N1流感」）
組成The strain is classified as hemagglutinin type 1 and neuraminidase type 1 — that is what the H1 and the N1 stand for.
同家族的字
- H5N1another flu virus named with the same H and N system
- hemagglutininthe H in the name
- neuraminidasethe N in the name
原始詞典資料1 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
H1N1noun
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medicinesciencesA strain of influenza, the most common cause of flu in humans; also the strain responsible for swine flu.
- The current H1N1 virus (swine flu) is a mixture of avian flus that passed through pigs to humans.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。