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Anosmia persisting for more than 3 months after COVID-19 (pan-cytokeratin immunostain)

Immunostain in a 63-year-old woman showed possible attenuated residual surface epithelial cells, stained brown (arrowhead). (×25) (Source: Vaira LA, Hopkins C, Sandison A, et al. Olfactory epithelium histopathological findings in long-term coronavirus disease 2019 related anosmia. J Laryngol Otol 2020;134[12]:1123-7. Creative Commons Attribution 4.0 International [CC BY 4.0] license, creativecommons.org/licenses/by/4.0.)

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