The bacterium that causes tuberculosis (TB) is so genetically distinct in different parts of the world that tackling the disease could require separate vaccines for each region, say researchers.

科学家说，导致结核病的细菌在世界不同地方的遗传结构是如此不同，因此防控结核病可能需要为不同地区研制不同的疫苗。

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The Welsh government said it remained committed to tackling bovine TB.

BBC: Bovine TB in Wales 'out of control' claims farming union