And the large Numbers infected within a short time make pandemics disruptive, even when the virus itself is not an efficient killer.

大部分感染人群在很短时间内会使得流行性疾病发生变异，甚至病毒本身就不是一个有效杀手。

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"It is therefore clear the existing systems provided no safeguard at all against a determined killer within the medical profession, " she said.

BBC: Shipman suspicions 'drove me mad'

The real killer is the accountability structure within which a chancellor must operate.

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Within a week DNA tests proved he was not the killer.

BBC: NEWS | UK | England | Cornwall | 'Luck' led to Caroline's killer