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Study: Why Covid19 Patients Suffer From Fatigue And Breathing Problems

The study shows the unique characteristics of the SARS-CoV-2 virus

In what could explain why some patients suffer from long Covid-induced lung problems, a new investigation of deceased patients has shed light on possible lung damage caused by the novel coronavirus.

The study shows the unique characteristics of the SARS-CoV-2 virus and may explain why patients suffer from ‘long COVID’ and experience the effects of the disease for months with a feeling of fatigue and lack of breath.

To dig deeper, researchers led by King’s College London analyzed the organs of 41 patients who died of Covid-19 at the University Hospital of Trieste, Italy.

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The team took lung, heart, liver, and kidney samples to examine the behavior of the virus.

The findings showed extensive lung damage in most cases, with patients experiencing profound disruption of the normal lung structure and the transformation of respiratory tissue into fibrotic material.

covid19 patients
The presence of virus cells remains and damages the lungs. Pixabay

Almost 90 percent of Covid19 patients showed two additional characteristics that were quite unique to Covid-19 compared to other forms of pneumonia.

First, Covid19 patients showed extensive blood clotting of the lung arteries and veins (thrombosis).

Second, several lung cells were abnormally large and had many nuclei, resulting from the fusion of different cells into single large cells.

This formation of fused cells (syncytia) is due to the viral spike protein, which the virus uses to enter the cell.

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“When the protein is present on the surface of cells infected by the Covid-19 virus, it stimulates their fusion with other normal lung cells, which can be a cause for inflammation and thrombosis,” the authors wrote in a paper published in The Lancet’s biomedicine, by King’s College London in collaboration with the University of Trieste and the International Centre for Genetic Engineering and Biology in Italy.

Additionally, research showed the long-term persistence of the viral genome in respiratory cells and in cells lining the blood vessels, along with the infected cell syncytia.

The presence of these infected cells can cause the major structural changes observed in the lungs, which can persist for several weeks or months and could eventually explain ‘long Covid’.

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The study found no overt signs of viral infection or prolonged inflammation detected in other organs.

“The findings indicate that Covid-19 is not simply a disease caused by the death of virus-infected cells but is likely the consequence of these abnormal cells persisting for long periods inside the lungs,” said Professor Mauro Giacca from the British Heart Foundation Centre at King’s College London.

The team is now actively testing the effect of these abnormal cells on blood clotting and inflammation and is searching for new drugs that can block the viral spike protein which causes cells to fuse. (IANS)



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