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t's a common yet curious tale: a household hit by Covid, but one family member never tests positive or gets so much as a sniffle.
Meanwhile there are those who have had Covid and been double-jabbed and boosted, yet still pick up the virus again.
As infections continue to soar in the new Omicron wave – an astonishing one in 25 people in England have Covid, according to Office for National Statistics data – cases of people who managed to stay free of the infection become ever more remarkable. Is it sheer luck? Some kind of superpower?
Now scientists may have an answer: there is mounting evidence that some people are naturally Covid-resistant.
For reasons not fully understood, it's thought that these people were already immune to the Covid virus, and they remain so even as it mutates.
The phenomenon is now the subject of intense research across the world.
Nasim Forooghi (pictured), 46, a cardiac research nurse at St Bartholomew's Hospital in Central London, has been potentially exposed to hundreds of people infected with Covid since the start of the pandemic, but has had a succession of antibody tests which found no trace of the virus ever being in her system
There is mounting evidence that some people are naturally Covid-resistant
And at University College London (UCL), scientists are studying blood samples from hundreds of healthcare staff who – seemingly against all odds – avoided catching the virus (file image)