New Onset of Type 1 Diabetes Mellitus Post-COVID-19 Vaccine.

Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection is associated with an increased morbidity and mortality worldwide. Coronavirus disease 2019 (COVID-19) vaccines have shown high efficacy in preventing the infection but with many possible side effects such as hyperglycemia. New-onset diabetes mellitus (DM) and severe metabolic complications have been reported post-vaccination.