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. 2021 Jan 20;49(1):0300060520982832. doi: 10.1177/0300060520982832

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© The Author(s) 2021

Creative Commons Non Commercial CC BY-NC: This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (https://creativecommons.org/licenses/by-nc/4.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 3. — Agglutination activity (hemagglutinin [HA] titers) of four influenza strains in red blood cells (RBCs) of different types: (a) chicken RBCs (with α-2,3-linked sialic acid receptors and α-2,6-linked sialic acid receptors); (b) chicken RBCs treated with α-2,3-sialidase (with only α-2,6-linked sialic acid receptors); (c) sheep RBCs (with only α-2,3-linked sialic acid receptors); and (d) chicken RBCs treated with Vibrio cholerae neuraminidase (VCNA; no receptors). Influenza strains: F076 (A/Hebei/F076/2018, human, associated with severe illness in 2018), HB17 (A/Hebei/HB17/2017, human, associated with severe illness in 2017; control), CA04 (A/CA/04/2009, pandemic flu virus; control), and 16275B (B/Hebei/16275B/2018, human, associated with severe illness in 2018).