FIG 4.

Interleukin levels from culture media postexposure. The graphs show cytokine levels (in nanograms per milliliter) in culture media after exposure to fecal filtrates of early and late stool samples at 4, 24, and 48 h. IL-6 (A) and IL-8 (B) levels were significantly higher after exposure to late stool samples compared to early stool samples and blank controls. The cytokine levels also increased significantly at 24 and 48 h compared to 4 h postexposure to fecal filtrates but not in blank controls (* indicates P < 0.05).