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Scientists discover many people unexposed to coronavirus have immune cells for COVID-19 – Sydney Morning Herald

Evidence is emerging around the world showing some people who have never been exposed to COVID-19 have immune cells that can recognise and react to the virus.

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Professor Tscharke said the cross-reactive T cells might help to fight off the virus, or they might get in the way of the immune system, making the disease worse, a phenomenon known as “original antigenic sin”.
This electron microscope image shows a human T cell, in blue.Credit:NIH/AP
Typically, the human adaptive immune system relies on precision. Antibodies, for example, have to be exactly the right shape to stick to a particular virus and kill it.
T cells hunt for tiny fragments of virus p…

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