Abstract
SUMMARY: The inoculation of killed Salmonella pullorum into the developing avian embryo on or after the 17th day of incubation or of live Sal. pullorum into young chicks evoked no immediate antibody response. Approximately 20–40 days after hatching, however, agglutinins and non-agglutinating antibodies were sometimes detected in the sera of these chicks. Maximum antibody production did not occur until the chicks were approximately 100 days old.

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