Antigenic shift in influenza viruses causes pandemics through the reassortment of viral genome segments, such as when human and swine flu A virus segments combine, leading to major genetic changes.
流感病毒的基因重組（antigenic shift）會引起全球大流行，是通過病毒基因組片段的重新組合發生的，例如人類流感病毒與豬流感病毒的基因片段重組。這種情況下的基因變化較為劇烈並可能引發大流行。
| Front | Genetic shift/ antigenic shift Causes epidemic or pandemics? by what process does the genome change? example? mnemonic to tell between drift?(which is more severe |
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| Back | Causes pandemics. Reassortment of viral genome segments, such as when segments of human flu A virus reassort with swine flu A virus. |
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