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. 2021 Aug 5;13(8):1550. doi: 10.3390/v13081550

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Fluorescent immunohistochemistry for SARS-CoV-2 nucleoprotein identifies mononuclear cells in tracheobronchial lymph nodes of intratracheally infected cats. Low numbers of SARS-CoV-2 positive cells (green, white arrows) are detected in (A) positive control tissue (lung) from an African Green Monkey infected with SARS-CoV-2 [50], and within (B) mononuclear cells in the TBLN of SARS-CoV-2-infected cats (green, white arrow). White, DAPI/nuclei; green, CoV-2. Magnification 40×, scale bar = 20 µm.