Influenza pandemics, whether moderate or severe, are remarkable events because of the almost universal susceptibility of the world's population to infection.
Current laboratory testing suggests that the level of reduced susceptibility is moderate.
目前实验室检测表明，敏感性降低程度为轻度。
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Known susceptibility genes account for less than 25% of the familial risk of breast cancer, and the residual genetic variance is likely to be due to variants conferring more moderate risks.