Spleen colonization of chicks infected with <i>S.</i> Senftenberg.

<p>Broiler chikens were orally infected with 10⁵ CFU. A) Frequency of spleen colonization by persistent (SS308, SS209) and non-persistent (SS278, SS304) strains of <i>S.</i> Senftenberg at different times post-infection. B) Number of CFU of <i>S.</i> Senftenberg per gram of spleen. Spleen samples which were positive after enrichment were given a value of 33 CFU. These results correspond to the mean of 15 animals (positives and negatives) ± SEM.* Letters (a–b) indicate a significant difference in means of spleen colonization levels between the groups of persistent (SS308, SS209) and non-persistent strains (SS304, SS278) at the 0.05 level.