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. 2021 May 26;78(7):2753–2761. doi: 10.1007/s00284-021-02520-x

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© The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2021

This article is made available via the PMC Open Access Subset for unrestricted research re-use and secondary analysis in any form or by any means with acknowledgement of the original source. These permissions are granted for the duration of the World Health Organization (WHO) declaration of COVID-19 as a global pandemic.

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Fig. 2 — Distribution of percentage of serum samples positive for influenza A (pdm H1N1 2009) antibodies and number of human cases reported. Right Y axis represents the percentage of swine serum samples seropositive for influenza A (pdm H1N1 2009) and left Y axis represents the number of human cases reported. [Source: Global Influenza Surveillance and Response System, World Health Organization (WHO)]