Figure 2.

Key features of anosmia in coronavirus disease 2019 (COVID-19): rapid onset, relatively short duration, and usually rapid recovery.

Examples of two typical cases of anosmia, according to scores obtained with the University of Pennsylvania Smell Identification Test (UPSIT) on volunteers inoculated with the G614 variant of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) on day 0 [36]. (A) Example of a case with abrupt onset and abrupt recovery of smell. (B) Example of a case with abrupt onset and gradual recovery of the sense of smell. Note the relatively short duration of anosmia (mean of 7.8 days; range of 4–21 days for transient anosmia [36]), which is consistent with a similar time-course reported in meta-analyses that examined epidemiological studies of the same variant and populations in similar geographic regions [37,38]. Modified from [36].