that both HAT and TMPRSS2 are coexpressed with 2,6-linked sialic acids , the major receptor determinant of human influenza viruses , throughout the human respiratory tract .
Similarly , coexpression of ACE2 , the SARS - coronavirus receptor , and TMPRSS2 was frequently found in the upper and lower aerodigestive tract , with the exception of the vocal folds , epiglottis and trachea .
Here , we show that both HAT and TMPRSS2 are coexpressed with 2,6-linked sialic acids , the major receptor determinant of human influenza viruses , throughout the human respiratory tract .
Similarly , coexpression of ACE2 , the SARS - coronavirus receptor , and TMPRSS2 was frequently found in the upper and lower aerodigestive tract , with the exception of the vocal folds , epiglottis and trachea .