Mysteries Of COVID Smell Loss Finally Yield Some Answers-Scientific American

An estimated 80 percent of people with COVID-19 have smell disturbances, and many also have dysgeusia or ageusia (a disruption or loss of taste, respectively) or changes in chemesthesis (the ability to sense chemical irritants such as hot chilies). Smell loss is so common in people with the disease that some researchers have recommended its use as a diagnostic test because it may be a more reliable marker than fever or other symptoms. One lingering mystery is how the novel coronavirus robs its victims of these senses. Scientific American, 11/18/2020

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