名校
1 . 医学上常用基本传染数
来衡量传染病的传染性强弱,其中
,
)表示
天内的累计病例数.据统计某地发现首例
型传染性病例,在
内累计病例数达到
例,取
,根据上面的信息可以计算出
型传染病的基本传染数
.已知
型传染病变异株的基本传染数
(
表示不超过
的最大整数),平均感染周期为
天(初始感染者传染
个人为第一轮传染,经过一个周期后这
个人每人再传染
个人为第二轮传染,以此类推),则感染人数由
个初始感染者增加到
人大约需要的天数为( )(参考数据:
)
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