Figure 6. Comparison of interleukin-8 expression on the mRNA level after infection with epidemic keratoconjunctivitis–type human adenovirus-D37 and non epidemic keratoconjunctivitis–type human adenovirus-D22. Primary porcine corneal epithelial cells, PPCE (A), primary human corneal epithelial cells PHCE (B), primary porcine corneal keratocytes PPCK (C), and primary human corneal keratocytes PHCK (D), respectively (unpaired, two-tailed Student t test). Increase of interleukin-8 (IL-8) messenger ribonucleic acid (mRNA) concentration was quantified with real-time polymerase chain reaction (PCR) in comparison to mock infected controls.