TMPRSS2 and Ageusia: This last hypothesis is favored by the expression of receptors for ACE 2 proteins and for serine transmembrane protease 2 (TMPRSS2) in cells of the olfactory epithelium, which are necessary for SARS-CoV-2 infection in humans [31,32] and were described in anosmia in 5.1% of patients and in ageusia in 5.6%.