Molecular changes in skeltal muscle tissue after fatal COVID-19

This retrospective cohort study involved unvaccinated patients admitted to a private hospital in Curitiba, Paraná, Brazil, diagnosed with COVID-19 and died as a result of SARS-CoV-2 infection. Muscle tissue samples were obtained post-mortem when legal representatives signed an informed consent form. The Ethics Committee of the Pontifical Catholic University of Paraná, Brazil (protocol number: 44334921.4.0000.0020) granted ethical approval.