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SUMMARY  Commercially reared chickens were challenged with  Salmonella enteritidis  phage-type (PT) 4 by aerosol, or via the conjunctiva. Inhalation of 2·9 × 10 2  or 4·2 × 10 3  S.  enteritidis  resulted in the production of IgG antibodies to the lipopolysaccharide (LPS) of  S. enteritidis  PT4. When the aerosol inoculum was increased to 2·4 × 10 5  bacteria per bird the antibody produced were predominantly of the IgM-class. Chickens challenged with 10 3  S. enteritidis  PT4 via the conjunctiva mounted only a poor immune response. Increasing the challenge dose to 10 8  S.  enteritidis  resulted in the production of high-titre serum antibodies of both the IgG and IgM classes. Results from this study suggest that aerosols containing small numbers of  S. enteritidis  PT4 might be responsible for intraflock infection of poultry.

Serological responses of chickens experimentally infected with Salmonella enteritidis PT4 by different routes