of people who have never been exposed to COVID-19 have immune cells that can recognise and react to the virus.
T cells hunt for tiny fragments of virus protein – as small as eight amino acids long, in a virus that could have thousands of them – that identify a virus has infected a cell.SARS-CoV-2, the virus that causes COVID-19, shares much of its genetic code, including many of its proteins, with four coronaviruses in frequent circulation among humans.
Monash University head of microbiology Professor Stephen Turner handling a culture medium in flasks used for growing and studying virus-specific T cells.They cause the common cold and are extremely common – more than 90 per cent of people have been exposed to them. Monash University's head of microbiology, Professor Stephen Turner, said that in the best-case scenario, cross-reactive T cells do offer some protection."That's why we might be seeing so much asymptomatic infection. If there is a level of protection, due to previous exposure, you have less symptoms – because you're limiting the amount of virus that can grow," he said.people who had cross-reactive T cells to that virus were less likely to suffer severe symptoms.
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