There are now so few English people with Covid-19 it is impossible to test a vaccine here, an expert said.
Prof Sarah Gilbert of the University of Oxford is against the clock for her potential to jab overseas where infection rates are higher.
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A sufficient number of vaccinated volunteers should be exposed to the virus to see if the injection protects.
But they are unlikely to encounter the bug in the UK because less than one in 1,700 have it.
Professor Gilbert told one of the House of Lords committee: “We have had the lockdown, which fortunately has reduced transmission – no luck for those of us trying to develop vaccines in the UK . ”
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It is hoped that the vaccine could be ready for widespread use by October.
Imperial College London, which is also developing a potential Covid-19 jab, has now vaccinated its first volunteers.
The anonymous participant is in good health after being injected on June 19.
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