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. 2020 Jan 24;8(1):43. doi: 10.3390/vaccines8010043

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© 2020 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 (http://creativecommons.org/licenses/by/4.0/).

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(A) Serum samples from children tested by ELISA, HI, SRH, MN and ELLA assays; (B) Serum samples from children tested by ELISA and HI. The HI titer of each sample is indicated below the x-axis. Blue bars = head signal, and green bars = stalk signal. Asterisks indicate statistical significance; a black asterisk indicates a significant increase in the HA signal; a blue asterisk indicates a significant increase in the head signal; a green asterisk indicates a significant increase in the stalk signal. Error standard bars are reported both for head and stalk signal.