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H5N1 is a kind of bird flu. It mostly lives in birds, especially chickens and ducks, but it can jump to people, and when it does it is often very dangerous — many of those who catch it die. That is why governments watch it so carefully, and why you see it in the news when chickens are culled or a human case appears. Ordinary talk in Taiwan is usually 禽流感; the letters H5N1 are what scientists and headlines use when they mean this particular strain, not bird flu in general. Though actually there are other bird-flu strains too; H5N1 is just the one that first made the world very afraid.
H5N1、禽流感（特指這種高致病性的鳥流感病毒株）
組成Named the same way as other flu strains: H5 is hemagglutinin type 5; N1 is neuraminidase type 1.
同家族的字
- H1N1another flu virus named with the same H and N system
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。
H5N1noun
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medicinesciencesA strain of avian influenza, often lethal in humans but not transmissible between humans.
- Authorities said the discovery of H5N9 bird flu in poultry came alongside the detection of the more common H5N1 strain on the same farm in Merced county, California, and that almost 119,000 birds on the farm had been killed since early December.
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。