Antigenic drift in influenza viruses causes epidemics through minor genetic changes resulting from random mutations in the hemagglutinin or neuraminidase genes.
流感病毒的抗原漂移（antigenic drift）會引起季節性流行（epidemics），是血球凝集素或神經胺酸酶基因的隨機突變導致的微小遺傳變化。
| Front | Genetic drift/ antigenic drift cause epidemic or pandemics? minor or major changes in genome occur via what method? what genes are affected in influenza?2 |
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| Back | Causes epidemics. Minor (antigenic drift) changes based on random mutation in hemagglutinin or neuraminidase genes. |
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