查明这些袭击的罪犯，几乎是不可能的，因为网络攻击通常会通过多层被感染的计算机进入，以掩盖其发起源头。
Identifying the culprits in such attacks can be next to impossible, because computer attacks are typically routed through multiple layers of infected computers to disguise the source.
FDA称，1995年以来，有9次大肠杆菌暴发感染的源头都是产自萨莱纳山谷、包括菠菜在内的新鲜食品。
According to the FDA, fresh produce from the valley, including spinach, has been the source of nine E. coli outbreaks since 1995.
此次感染的源头认为是从德国北部的一个有机农场生产的豆芽产生。
The source of infection has been identified as bean sprouts from an organic farm in northern Germany.
德国下萨克森州说，该州将进一步检测豆芽样本以确定这些豆芽是否感染了菌株。德国官员此前怀疑这些豆芽是此次爆发的致命性疫情的源头。
The German state of Lower Saxony said it will test further samples of bean sprouts, which German officials thought might be behind the deadly outbreak, to see if they are infected with the strain.
德国下萨克森州说，该州将进一步检测豆芽样本以确定这些豆芽是否感染了菌株。德国官员此前怀疑这些豆芽是此次爆发的致命性疫情的源头。
The German state of Lower Saxony said it will test further samples of bean sprouts, which German officials thought might be behind the deadly outbreak, to see if they are infected with the strain.
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