TLR2 and type 2 diabetes mellitus: <h4>Objective</h4>This study aimed to characterize the expression levels and identify the risk factors associated with Toll-like receptor 2 and 4 (TLR2/4) mRNA in peripheral blood mononuclear cells of patients with type 2 diabetes mellitus (T2DM) complicated with pulmonary infection, and to develop and internally validate a nomogram-based diagnostic model.<h4>Methods</h4>A total of 239 patients with T2DM admitted to our hospital between January and August 2025 were selected.