Figure 4

Quantification of Salmonella Typhimurium specific antibodies in serum and yolk. Salmonella Typhimurium specific antibody titers (antilog antibody titres ± SEM) were characterised over the course of the experiment in both serum (A) and yolk (B) in control birds (black hashed line) as well as hens infected with only Salmonella Typhimurium (black line) or a combination of both Salmonella Typhimurium and Salmonella Mbandaka (red line). In the serum, the amount of Salmonella Typhimurium antibody was significantly higher in singly infected birds compare with co-infected birds from week 6 pi till the end of the experiment (*p < 0.01). Mean antibody titres detected in yolk samples collected from Salmonella Typhimurium infected birds were only significantly different from co-infected birds at week 14 pi (*p < 0.01).