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. 2019 Jan 3;7(1):4. doi: 10.3390/vaccines7010004

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© 2019 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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Chart showing mean serotype 3 specific IgG concentration compared to percentage agreement between labs for the UK National External Quality Assessment Service for Immunology, Immunochemistry and Allergy (UK NEQAS IIA) pneumoccocal antibody serotype-specific immunoassay distributions between 2016–2018. Positive results are those assigned a concentration greater than the correlate of protection (0.35 μg/mL) by that laboratory and negative results are those equal to or lower than the correlate of protection. Percentage of agreement equals the percentage of laboratories assigning the same result, with 50% being the lowest possible.