The decrease of hsa‐let7b‐5p expression levels in NPS of COVID‐19 patients is in line with the overexpression of ACE2 and DPP4 genes (ACE2 FC = +1.88, p ≤ 0.05; DPP4 FC = +3, p < 0.01) in the same patient samples, observed in our previous paper.21 Here, DPP4 is linked to COVID-19.