It's one of the most puzzling and concerning question facing researchers: what are the long-term impacts of COVID-19, and why are some people worse affected than others?
It can be tempting to think of COVID-19 patients as falling into one of two categories.Category 2: older people and people with pre-existing health conditions who become seriously ill and go to hospital.
Research from the US and UK, following a much broader group of people affected by COVID-19, suggests symptoms persist in about 10 to 15 per cent of cases. SARS-CoV-2 is primarily thought of as a respiratory virus, but the damage caused by COVID-19 is not always restricted to the lungs. "Most likely, they've had this overwhelming inflammatory response — which we know happens in COVID-19 patients — and then that's had knock-on effects."Lungs can be damaged when the virus enters the cells of the airways. It can cause scarred, stiff tissue that makes it difficult for the lungs to do their job of oxygenating the blood — leaving people breathless.
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