To the Editor:Diabetes represents a pandemic that has been recognized as an independent risk factor for severe infection with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) in the context of the coronavirus disease 19 (COVID-19) pandemic, 1 although it may not actually increase the risk for SARS-CoV-2 transmission for patients with diabetes compared with the general population. 2,3 Patients with diabetes feature a twofold increase in the odds for severe SARS-CoV-2 infection and a two-to threefold increase in the odds for death because of disease. 1,4,5 Patients with diabetes experience a significant increase in the risk for in-hospital death because of SARS-CoV-2 infection, as shown in a recent, large nationwide study. 6 Therefore, optimal treatment strategy for these patients becomes a top priority. 7 Sodium-glucose co-transporter-2 (SGLT-2) inhibitors, an antidiabetic drug class with multiple, pleiotropic and beneficial effects, especially in patients with concomitant cardiovascular or renal disease, should be used with caution in the context of infection, because of the increased risk for diabetic ketoacidosis. 8 The anti-inflammatory properties of SGLT-2 inhibitors might be beneficial for infected patients, as they could hypothetically ameliorate the cytokine storm. 9,10 Previous studies have shown the significant reduction in inflammatory markers, such as C-reactive protein, ferritin and interleukin-6, with SGLT-2 inhibitors. 9 In addition, this drug class exerts beneficial effects on endothelial function, a finding that could have potential applicability for the prevention of thrombotic complications among SARS-CoV-2 patients. 11 Recently published observational studies support that SGLT-2 inhibitors are not inferior to incretin-based agents concerning surrogate COVID-19 outcomes, 12 while they might decrease the risk for mechanical ventilation. 13 However, more evidence from clinical practice is required, to identify the impact of antidiabetic drugs administered prior to infection on outcomes of interest among infected patients. 14,15 In addition, the ongoing DARE-19 trial, whose protocol has recently been published in Diabetes, Obesity and Metabolism, will provide answers on whether dapagliflozin could prevent COVID-19-related complications and all-cause mortality in patients admitted with SARS-CoV-2 infection. 16 We sought to determine whether SGLT-2 inhibitors influence the risk for respiratory tract infections and acute respiratory distress syndrome (ARDS), pooling data from the published cardiovascular and renal outcome, placebo-controlled trials until November 2020.