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Forest plot showing the results of the final conditional regression analysis. a ILI = Influenza-like illness; URI = Upper respiratory tract infections, b Any occurrence of chronic comorbidities among: malignancies, immunocompromised states (e.g. transplantation, use of immunosuppressants, HIV infection), autoimmune disorders (e.g. thyroiditis, diabetes type I, rheumatoid arthritis, vasculitis) and past surgical intervention
