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None of the candidate vaccines in advanced clinical trials have so far demonstrated a "clear signal" of efficacy at the level of at least 50% sought by the WHO, spokeswoman Margaret Harris said last week.
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Similar sentiments have been shared by Thomas Cueni, director-general of the International Federation of Pharmaceutical Manufacturers. The industry body represents the companies that signed the pledge.
"I think it's fairly unlikely that we will have a vaccine approved or in particular distributed at large scale before the end of this year," he told the BBC. "We may be surprised but clearly the manufacturers do not want speed above quality".
Despite this, China and Russia have begun inoculating some key workers with domestically developed vaccines. All of them are still listed by the WHO as being in clinical trials.
Meanwhile, the US national regulator, the Food and Drug Administration (FDA), has suggested that coronavirus vaccines may be approved before completing a third phase of clinical trials. This phase can often involve thousands of participants and last several years.
Short cuts and 'dirty tricks' in the scramble for a vaccine
How will the world vaccinate seven billion people?
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President Trump has hinted that a vaccine might be available before the election. But his Democratic rival Joe Biden has expressed scepticism that Mr Trump will listen to scientists and implement a transparent process.
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