When the good luck runsout, stem rust can destroy the entire harvest in an infected area.

当好运用完的时候，小麦锈病能够摧毁感染地区的所有农作物。

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In inflammation, the body's immune system causes blood vessels to allow chemicals and blood cells to leak into an infected area, designed to attack the infection, but an over-response can cause harm.

身体的免疫系统使化学物质和血细胞渗出血管，到达炎症部位对抗感染，但是过度的免疫反应会造成伤害。

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In April, the CDC got a report from Navy researchers that a child in the San Diego area had been infected with an unknown virus.

今年4月，美国疾病控制和预防中心(CDC)收到来自海军研究实验人员的汇报，报告说有一名圣地亚哥地区的孩子感染上一种未知的病毒。

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When the good luck runs out, stem rust can destroy the entire harvest in an infected area.

ECONOMIST: Wheat rust and world farming

"We have to prepare ourselves for the likelihood that swine flu will reach Guernsey, but it may not be in a way we initially expected, through travel to an infected area, " he added.

BBC: Island swine flu tests stepped up

According to the government's own bovine-tb-impact-assessment, the public costs of carrying out the cull exceed any money saved from predicted falls in bovine TB (an average 16% reduction in new cases over nine years - in absolute figures, this amounts to preventing 47 out of 292 infected herds, for an area about half the size of the Gloucestershire pilot zone).

BBC: Analysis: The battle over brock