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watch One-Minute World News Last Updated: Tuesday, 2 August
2005, 23:38 GMT 00:38 UK TB vaccines 'fail poorer nations' Image
of TB TB is caused by Mycobacterium tuberculosis Current TB
vaccines are flawed and will fail to protect people living near
the Equator, warn UK experts.  While boosting a person's natural
immunity works in richer Western countries, in poorer nations
this approach does not work, they say.  According to the
University College London team, a better way would be to
suppress inappropriate responses by the body that allow the
disease to thrive.  They put forward their argument in Nature
Review Immunology.  However, their investigations are at a very
early stage and the theory has not been proved in humans.  Big
killer  TB is a big problem globally. It is killing at least two
million people a year, or 5,000 every day, mainly in the
developing world.  Three or four people get the disease every
second, meaning about nine million new c