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Level of significance among biosecurity measures in broiler, turkey, and layer farms. The figure shows the significance found between each biosecurity measure. (a) External biosecurity. (b) Internal biosecurity. The number of responding farms is reported beside each bar. p < 0.05 shown as *, p < 0.01 as **, p < 0.005 as ***, and p < 0.001 as ****. The whiskers represent the 95% confidence intervals (CI).
