© Provided by The Independent Early research into people infected with the coronavirus variant first detected in Brazil, known as P1, estimates that it is roughly twice as infectious as other mutated forms of the virus and can partially evade immunity elicited by previous infection.
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However, experts cautioned that the research cannot be used to predict what may happen in the UK, and say it does not suggest that vaccines will not work against the variant.
It comes after six cases of P1 were detected in the UK, with officials racing to hunt down one person whose identity and whereabouts is unknown as they did not complete their registration form properly.
Meanwhile, scientists have said that joggers should wear face coverings because running past others while "puffing and panting" could post a "danger" - but they should be able to "run freely" in wide open spaces.
Trish Greenhalgh, professor in primary care health sciences at the University of Oxford, told Good Morning Britain: "There is no doubt the virus is in the air, there is no doubt that you can catch it if you inhale, and that someone else has exhaled.
"The exercising jogger - the puffing and panting jogger - you can feel their breath come and you can sometimes actually feel yourself inhale it, so there's no doubt that there is a danger there.
"Forty per cent of Covid cases happen by catching it from people who have no symptoms. So you're jogging along, you think you're fine, and then the next day you develop symptoms of Covid, but you've actually breathed that Covid onto someone perhaps you know, an old lady walking a dog or something like that."