Regretfully, I have not had much success finding references to viral anosmia on the Internet. Here are the few which I found and decided were useful. If you find some I missed, please do point me to them. Thanks.
Unbearable Absense of Smelling -- New Scientist Article by Mick O'Hare.
Biopsies of Human Olfactory Epithelium -- search for "viral"
Lipoic Acid in the Treatment of Smell Dysfunction Following Viral Infection of the Upper Respiratory Tract -- Hummel et al., 2002.
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This page most recently revised on 19-Feb-2021.