以上各感染源对疾病总负担的相对贡献情况目前还不清楚，但食用未煮熟的受污染家禽被认为是一个主要因素。

The relative contribution of each of the above sources to the overall burden of disease is unclear but consumption of undercooked contaminated poultry is believed to be a major contributor.

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从世界范围的情况看，四分之一的疾病总负担是由环境危害造成的，其中有三分之一以上发生在儿童当中。

Environmental hazards are responsible for as much as a quarter of the total burden of disease world-wide, and more than one-third of the burden among children.

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五岁以下儿童死亡中三分之二以上是由一些可通过负担得起的简单干预措施得以预防和治疗的疾病所导致。

Over two thirds of under-five child deaths are due to diseases that are preventable and treatable through simple, affordable interventions.

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