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. 2021 Jul 13;12:711997. doi: 10.3389/fimmu.2021.711997

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Copyright © 2021 Chen, Wang, Zhang and Ly

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Strategies to develop HA stalk-directed universal influenza vaccines: hyperglycosylated HA, headless HA, long alpha helix (LAF) fragment, chimeric HA, and mosaic HA. The figure was created with Biorender.com.