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The scientist behind the Pfizer/BioNTech COVID-19 vaccine says that the time between the first and second dose should not be longer than six weeks. BioNTech chief executive Professor Ugur Sahin was responding to the UK's decision to delay the second dose by up to 12 weeks to allow more people to get a first dose quickly. Prof Sahin acknowledged governments have difficult decisions to make with limited supplies of the vaccine, but he added that there needs to be recognition of the limited protection provided by just one dose.
The UK has become the first country in the world to approve the Pfizer/BioNTech COVID-19 vaccine for use. The government says the jab, which has been given the green light by independent health regulator MHRA, will be rolled out across the UK from early next week. Scottish first minister Nicola Sturgeon has said Scotland's first doses will be administered on Tuesday.
The UK government is in "advanced discussions" with Moderna to ensure access to its vaccine by spring next year - with results showing the jab is 94.5% effective. The vaccine, which Moderna produced in collaboration with the US government's "Operation Warp Speed", has also been shown to last for up to 30 days in household fridges and at room temperature for up to 12 hours. Following last week's news, governments around the world - including the UK - had been scrambling to deal with the logistical challenge of deploying the Pfizer vaccine, which is required to be stored at the much lower temperature of -70C.