There was no statistical difference between levels of IL-2 and severity of illness(P>0.05).

各疾病严重程度组间比较，IL-2水平无显著性差异（P>0.05）；

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Causes (temporary) radiation sickness such as nausea and decreased white blood cell count, but not death. Above this, severity of illness increases with dose.

导致(临时)放射病，如恶心，白血细胞数量下降，但不致死亡。以上这些，增加疾病的严重程度，当剂量增加。

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Forty-three of these countries are in sub-Saharan Africa, which is the heartland of malaria in terms of the number of cases and deaths and the severity of illness.

其中43个国家处于撒哈拉沙漠以南非洲地区，从患者数量、死亡数量和病情严重程度来讲，是疟疾最猖獗的中心地带。

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The reason on an absolute dollar basis that Medicare admin cost may be higher is because they use more services (medical services due to age and case mix severity of illness) and since a per cent of every dollar spend goes to admin service the absolute cost is higher.

FORBES: The Myth of Medicare's 'Low Administrative Costs'

But he subsequently acknowledged that when factoring in their travel, the severity of the illness can intensify.

CNN: Should tennis be worried about the 'kissing disease'?

Although high-volume units treated the sickest infants and had highest crude death rates, when the statistics were adjusted for factors such as the severity of the illness, patient volume and staffing provision, unit size did not influence death or brain damage rates.

BBC: 'Baby death risk' of busy units