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Very small numbers of people have been admitted to hospital with Covid several weeks after having one vaccine dose, a study of UK patients has found.
Most of those affected were frail and elderly and at high risk of being very unwell.
Researchers say the findings are reassuring because vaccines are never 100% perfect and failures are expected.
But they say some people may be letting their guard down too soon after one vaccine.
The study analysed a quarter of all hospital patients in England, Scotland and Wales between early December and early April, and is one of the first to look at the impact of vaccinations on the numbers of people subsequently admitted to hospital with Covid-19.
BBC News
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Very small numbers of people have been admitted to hospital with Covid several weeks after having one vaccine dose, a study of UK patients has found.
Most of those affected were frail and elderly and at high risk of being very unwell.
Researchers say the findings are reassuring because vaccines are never 100% perfect and failures are expected.
But they say some people may be letting their guard down too soon after one vaccine.
The study analysed a quarter of all hospital patients in England, Scotland and Wales between early December and early April, and is one of the first to look at the impact of vaccinations on the numbers of people subsequently admitted to hospital with Covid-19.
Good evidence from real-world data that Covid-19 vaccines are working – experts eveningexpress.co.uk - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from eveningexpress.co.uk Daily Mail and Mail on Sunday newspapers.
113 people in study of 52,000 died despite being vaccinated, data shows Potentially, we are under-representing vaccine failure, because people aren’t exposed to the virus.
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There is good evidence from early real-world data in the UK that Covid-19 vaccines are working after the first dose, experts have said.