IL18 and COVID-19: ML analyses identified IL-18, CRP, and IL-6 as the most informative biomarkers of COVID-19 severity, with IL-18 showing the highest feature importance (0.276, 0.202, and 0.175, respectively).<h4>Conclusion</h4>This study highlights the critical role of inflammatory biomarkers and host genetic factors in COVID-19 severity among T1DM patients and identifies IL-18 as a robust and clinically relevant biomarker for risk stratification.