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Boris Johnson will address the nation in a press conference tonight following significant news about one of the coronavirus vaccines currently being rolled out in the UK.
The Prime Minister will hold a briefing at 5pm on Wednesday, following an announcement from Oxford University that their vaccine can halt transmission of Covid-19 by up to two-thirds.
Scientists found there was a 67% drop in positive swabs among those already vaccinated with the Oxford/AstraZeneca jab.
This means those given the vaccine are not only less likely to get severely ill or die, but also have some protection against catching the virus and passing it on to others.
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The study, which has not yet been formally published, is the first time a vaccine has shown to have an impact on the transmission of the coronavirus.
It measured the impact on transmission by testing for asymptomatic infections, swabbing participants every week as well as recording when anyone fell ill with Covid-19.
In addition to showing a significant effect on transmission, the study found the vaccine offered 76% effective protection from a single dose for three months.
With no fall in protection during the three-month period, the researchers said the results supported gaps between first and second doses of between four and 12 weeks.
The effectiveness of the Oxford-AstraZeneca vaccine increased with a longer gap of 12 weeks before the booster jab.
Once the second dose is given, the study found the level of protection rises to 82%.
Professor Andrew Pollard, chief investigator of the Oxford Vaccine Trial, said the findings support the "policy recommendation made by the Joint Committee on Vaccination and Immunisation (JCVI) for a 12-week prime-boost interval".
He said the study "reassures us that people are protected from 22 days after a single dose of the vaccine".
Health Secretary Matt Hancock called the study "really encouraging" on Twitter, adding that the results were "absolutely superb".
"Vaccines are our way out," he said of the pandemic which has now been raging for more than a year.
Figures show more than 10 million doses of the coronavirus vaccine have now been given in the UK – more than 9.6million first doses and nearly 500,000 second doses.
- Boris Johnson
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