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 .
Finally , activation of influenza virus was conserved between human , avian and porcine TMPRSS2 ,
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 .
Finally , activation of influenza virus was conserved between human , avian and porcine TMPRSS2 , suggesting that this protease might activate influenza virus in reservoir- , intermediate - and human hosts .