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. 2020 May 26:1–2. doi: 10.1159/000508768

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Copyright © 2020 by S. Karger AG, Basel

This article is made available via the PMC Open Access Subset for unrestricted re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for the duration of the COVID-19 pandemic or until permissions are revoked in writing. Upon expiration of these permissions, PMC is granted a perpetual license to make this article available via PMC and Europe PMC, consistent with existing copyright protections.

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Fig. 1 — a Nasal cytology within normal limits (May-Grünwald-Giemsa, ×800× magnification). b Normal ciliated cell. The arrow indicates the “hyperchromatic supranuclear stria” (SNS; May-Grünwald-Giemsa, ×2,000 magnification). c Nasal cytology in a COVID-19 patient (May-Grünwald-Giemsa, ×400 magnification). d Nasal cytology in a COVID-19 patient evidencing absence of the hyperchromatic SNS (May-Grünwald-Giemsa, ×1,000 magnification). Ci, ciliated cell; N, neutrophils.