REN and severe acute respiratory syndrome: Examination of the clusters revealed five coherent coronavirus-specific topics [comorbidities in high-risk group, SARS-related symptoms and complications, SARS-related drugs, SARS disease biomarkers and inflammation, and coronavirus receptors and RAAS (renin–angiotensin–aldosterone system), see Figure 3], showing that glucose is mentioned in the context of numerous stages of the coronavirus infection: from high-risk groups through to disease development and complications.