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. 2019 Jun 27;37(29):3866–3875. doi: 10.1016/j.vaccine.2019.05.050

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Crown Copyright © 2020 Published by Elsevier Ltd.

This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

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Fig. 1 — Chemical structure of Vi polysaccharide. Vi is a homopolymer of repeating units of α(1 → 4)-N-acetylated-D-galactosaminuronic acid (GalNAcA), O-acetylated at the C-3 position. The color scheme is the same as used in Fig. 7, Fig. 8: ring carbons (), N-acetyl (), O-acetyl (), and carboxyl ().

Inline graphic — Chemical structure of Vi polysaccharide. Vi is a homopolymer of repeating units of α(1 → 4)-N-acetylated-D-galactosaminuronic acid (GalNAcA), O-acetylated at the C-3 position. The color scheme is the same as used in Fig. 7, Fig. 8: ring carbons (), N-acetyl (), O-acetyl (), and carboxyl ().