John Fraser India Australia virus covid-19 DNA John Fraser India Australia

'Not just like the flu': Covid-19 directly damages heart tissue DNA, finds experts. Read here

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Covid-19 damaged the DNA in heart tissue, which was not detected in influenza samples. Notably the researchers also found that while Covid-19 and influenza are both severe respiratory viruses, they appeared to affect cardiac tissue very differently. "In comparison to the 2009 flu pandemic, Covid has led to more severe and long-term cardiovascular disease but what was causing that at a molecular level was not known," said Arutha Kulasinghe from the University of Queensland, Australia. "During our study, we couldn't detect viral particles in the cardiac tissues of Covid-19 patients, but what we found was tissue changes associated with DNA damage and repair," Kulasinghe said.

DNA damage and repair mechanisms are related to chronic diseases such as diabetes, cancer, atherosclerosis and neurodegenerative disorders, so understanding why this is happening in Covid-19 patients is important, the researchers said.

Data associated with the impact of Covid-19 on the heart has previously been limited to blood biomarkers and physiological measurement, as obtaining heart biopsy samples is invasive.

The findings provided insights into how Covid-19 impacted the body compared to other respiratory viruses. "When we looked at the influenza cardiac tissue samples, we identified that it caused excess inflammation," said Professor John Fraser, who established the international Covid-19 Critical Care Consortium. "Whereas we found Covid-19 attacked the heart's DNA -- probably directly and not just as a knock-on from inflammation," Fraser said.

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