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Oxford controversy is the first shot in international battle over vaccine efficiency

Trials will not reveal all the facts on prevention for each new drug – that process could last for years

In a few days, researchers plan to solve a medical mystery that threatens to erupt into a major transatlantic battle. Scientists at Oxford University say they intend to publish full, peer-reviewed data, in the journal Lancet, about trials they have completed on their Covid-19 vaccine.

The information, they say, should end mounting controversy about the vaccine’s effectiveness and explain apparent inconsistencies in trial results. Opponents, most of them American, say this is unlikely, and insist new phase 3 trials now need to be restarted from scratch to restore confidence in the vaccine.

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