Up to 50% of people may already have immune cells that could fight coronavirus

HALF of Americans could have some protection against COVID-19: Studies find many people have immune T cells to other coronaviruses that respond to the new virus A study of donated blood in the US found that half of samples had immune T cells that reacted to SARS-CoV-2   Similarly high rates were found in smaller studies of blood from people in the UK, Singapore, Germany and the Netherlands  T cells developed to fight other coronaviruses might be 'cross reactive' with the new virus that causes COVID-19 

By Natalie Rahhal Us Health Editor

Published: 01:55 BST, 19 September 2020 | Updated: 01:55 BST, 19 September 2020

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As much as half of the world's population may have some immunty to coronavirus, a small but growing body of research suggests. 

Tests done on donated blood in the US found that about 50 percent of the samples had immune T cells that reacted to coronavirus, suggesting that the donors' bodies might have the natural ability to fight of the deadly virus. 

Similar results have been found in the UK and Sweden. 

COVID-19 is thought to be so deadly in part because it's an entirely new virus to  which humans have no natural immunity. 

And while that is clearly the case for many people, British Medical Journal associate editor Dr Peter Dosh wrote on Thursday that the evidence is beginning to suggest that some people may possess some protection against the virus. 

Some people may have immune T cells to other coronaviruses that could fight SARS-CoV-2, recent research suggests

Some people may have immune T cells to other coronaviruses that could fight SARS-CoV-2, recent research suggests 

In March, a member of a Skagit  County, Washington choir went to their usual practice, feeling a bit ill, but unaware that they had coronavirus. 

Within a week, that person and another had tested positive for the virus that causes  COVID-19. Another 25 members of the 122-person choir had symptoms of coronavirus. 

In the weeks that followed, 52 of the other 60

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