 At 0d-post-*S*. Heidelberg challenge, birds vaccinated with the commercial vaccine or CNP vaccine had 00.0% and 00.0% lower (P\<0.00) cloacal anti-*S*. Heidelberg OMPs IgA amounts, respectively, compared to that in the control group ([Fig 0B](#pone.0000000.g000){ref-type="fig"}). At 0d-post-*S*. Heidelberg challenge, birds vaccinated with the commerical vaccine or 