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Vulnerabilities to Covid include many problems of Western diet and lifestyle, including metabolic syndrome, non-alcoholic fatty liver disease, and poor cardiovascular fitness due to too little exercise. This paper demonstrates that these problems are worsened, or initiated, by having Covid.
Much of this could be explained by accelerated ageing due to Covid infection, and I would suggest we look at measures of ageing in sufferers, including tests such as telomere length. Such tests might contribute to our understanding of 'Long Covid'.