cial Vaccine   0           0       0      0                           00            0.0     0.00                0.00   0                     0           0       0      0                           0                                            0                     0           0       0      0                           0                                            0                     0           0       0      0                           0                                            0                     0           0       00     000                         0.0                                          0                     0           0       0      0                           0                                            *P-*value             *P\>*0.00                                                                                          At 0d of age, chickens were orally vaccinated with either PBS (NV), 0000 μg chitosan nanoparticle vaccine (CNP) or a commercial vaccine (CV). The same route of delivery and doses was repeated at 0d of age. At 00d of age, birds were challenged with 0 X 00^0^ CFU/bird of either *S*. Enteritidis or *S*. Heidelberg. At 0d-post-challenge *S*. 