在正常年份大约有10-20%的人会感染季节流感，虽然每年这数字有变化。
About 10 to 20 in 100 people get seasonal (normal) flu during a normal year, although this varies from year to year.[4]
在正常年份大约有10-20%的人会感染季节流感，虽然每年这数字有变化。
About 10 to 20 in 100 people get seasonal (normal) flu during a normal year, although this varies from year to year.[4]
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