Professor Paul Fine, from the London School of Hygiene and Tropical Medicine said the BCG story was a very complicated one.

BBC: BCG is a vaccine which protects against TB

In an accompanying editorial Christopher Dye, of the World Health Organization (WHO), and Paul Fine, from the London School of Hygiene and Tropical Medicine, said although the results were disappointing they were "not a terminal prognosis for MVA85A, or for any of the other tuberculosis vaccines in development".

BBC: Tuberculosis vaccine hopes dashed

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BBC: Daily deal: Mexico for epicureans