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. 2023 Oct 10;21(10):e08271. doi: 10.2903/j.efsa.2023.8271

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© 2023 European Food Safety Authority. EFSA Journal published by Wiley‐VCH GmbH on behalf of European Food Safety Authority.

This is an open access article under the terms of the http://creativecommons.org/licenses/by-nd/4.0/ License, which permits use and distribution in any medium, provided the original work is properly cited and no modifications or adaptations are made.

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Distribution of geometric mean haemagglutinin inhibition (HI) titres for vaccines which stopped sustained transmission between vaccinated chickens (R < 1) or did not (R > 1)

Panels (A) and (C) show the distribution of homologous (A) or heterologous (C) HI titres reported in the reviewed transmission experiments. Panels (B) and (D) show the distribution of HI titres from the data obtained from the challenge experiments. Probability (R < 1) classes in these panels were derived using the model presented in Figure 5.