Pre-infection samples were analysed. We measured nasal ACE2/TMPRSS2 expression using RT-qPCR and characterized the nasal microbiome using 16S rRNA gene-based qPCR and sequencing. We used machine ...

All procedures were performed under endoscopic guidance:1.Transnasal endoscopic approach via the middle meatus(n=40)2.Combined endoscopic and pre-lacrimal recess approaches ... endoscopically ...