Major structural changes that persist for several months have been observed in the lungs of deceased COVID-19 patients and could help explain long COVID, scientists have said.
The findings, published in the journal Lancet eBioMedicine, are based on a study of the organs of 41 patients who died at the University Hospital of Trieste, Italy, between February and April 2020.
The researchers took samples from the lung, heart, liver and kidney from patients who had died of the coronavirus to examine its effect on different parts of the body. Extensive lung damage was found in most cases, with patients experiencing profound disruption of the normal lung structure and respiratory tissue.
The researchers said almost 90 per cent of patients showed two additional characteristics that were quite unique to COVID-19 compared with other forms of pneumonia – extensive blood clotting of the lung arteries and veins; and several abnormally large lung cells with many nuclei.
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These large lung cells are thought to have formed as a result of the smaller normal cells joining together, which was triggered when the coronavirus used its “spike protein” to enter human cells.
The researchers also found what they describe as a “long-term persistence” of the viral DNA in respiratory cells and in cells lining the blood vessels.
The presence of these infected cells can cause the major structural changes observed in lungs, the team said, which can persist for several weeks or months and could eventually explain long COVID, which is characterised by a feeling of fatigue and lack of breath.
However, no signs of viral infection or prolonged inflammation was detected in other organs.
“These findings are very exciting,” said Professor Mauro Giacca, from the British Heart Foundation Centre at King’s College London.
“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.”
The researchers are now testing the effect of these abnormal cells on blood clotting and inflammation while looking for new drugs that can block the viral spike protein which causes cells to fuse.
How can I protect myself from the coronavirus when shopping?
You’ll have seen signs in your local supermarket advising you to keep two metres from others while moving around the store. This is key to reducing your chances of catching the virus while shopping.
The coronavirus SARS-CoV-2 is spread through respiratory droplets that leave our mouth and nose when we cough, sneeze, or sometimes even talk. The droplets sprayed out by an infected person will contain the virus, which could then enter your body via your mouth, nose or eyes (this is why you shouldn’t be touching your face).
Respiratory droplets don’t usually travel more than one metre, so by keeping two metres from others, you’ll reduce the likelihood of being in the firing line. To make it easier to keep your distance, try to shop during off-peak hours, choose a store that’s limiting the number of people who can be inside at any one time, and use self-checkout if you can.
Keeping your hands clean is the other main thing you can do. If possible, wipe the trolley or basket handles with a disinfectant wipe when you arrive at the store. When you get home, wash your hands or use hand sanitiser before and after unpacking your bags.
A US study found that the coronavirus can survive for up to 24 hours on cardboard, and up to three days on hard, shiny surfaces such as plastic, so wiping down your purchases with a disinfectant spray or a soapy cloth before you put them away is another good habit to get into.
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