Direct measures of liking and intensity of taste, smell, and chemesthetic stimuli are similar between young people reporting they did or did not have COVID-19 (preprint)

The recovery period from post-COVID-19 smell and taste dysfunctions varies substantially, lasting from a few days to over a year. We aimed to assess the impact of COVID-19 on post-COVID-19 chemosensory sensitivity in a group of young convalescents of eastern/central European ancestry. We measured subjects smell and taste capabilities with a standard testing kit, Monell Flavor Quiz (MFQ), and collected surveys on COVID-19 history. During testing, subjects rated liking and intensity of six odor samples (galaxolide, guaiacol, beta-ionone, trimethylamine, phenylethyl alcohol, 2-ethyl fenchol) and six taste samples (sucralose, sodium chloride, citric acid, phenylthiocarbamide, menthol, capsaicin) on a scale from 1 (dislike extremely, or no intensity) to 9 (like extremely, or extremely intense). There was no statistical difference in intensity ratings or liking of any sample between subjects who reported a history of COVID-19 (n = 34) and those reporting no history (n = 40), independent of presence/absence or severity of smell/taste impairments (P > 0.05). Additionally, neither vaccination status (full vaccination or no vaccination) nor time from the COVID-19 onset (2-27 months) correlated with liking or intensity. These results suggest that most young adults who had COVID-19 recovered their sense of smell and taste.