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. 2016 Sep 27;94(10):387–393. doi: 10.1111/avj.12490

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© 2016 The Authors. Australian Veterinary Journal published by John Wiley & Sons Australia, Ltd on behalf of Australian Veterinary Association.

This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial‐NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.

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Mean log₁₀ Salmonella Typhimurium antibody ELISA titres in non‐challenged birds by vaccination groups over time. (A) Groups that received only an oral dose of the live vaccine (Vaxsafe® ST: Strain STM‐1, Bioproperties Pty Ltd, VIC, Aust; live‐attenuated aroA deletion mutant of S. Typhimurium). (B) Groups that received the inactivated vaccine (containing field isolates of serovar S. Typhimurium, Infantis, Montevideo and Zanzibar at 10⁸ CFU of each serovar per bird dose) by IM injection only at 12 weeks of age. (C) Groups that received the inactivated vaccine at 6 and 12 weeks of age or live vaccine by SC injection at 4 and 8 weeks of age. All charts show unvaccinated birds as a reference point and the x‐OvO ELISA positive cut‐off point (log₁₀ 2.89). Bars show standard error. CFU, colony‐forming units.