CXCL8 and infection: ETEC and EAEC infection caused similar IL-8 secretion at 0.5 h (around 0.7 ng/ml), 1 h (around 8 ng/ml), and 2 h (around 14 ng/ml), but at 4 h of infection, EAEC caused a significant increase of IL-8 secretion than ETEC (47 vs. 34.2 ng/ml; Figure 6A).