A combined in vitro and microarray study by Xiu et al. [19] confirmed that levels of IL-8 mRNA, but not TNFα mRNA, were elevated in MEC after artificial challenge by S. aureus. However, microarray analysis of MGST identified elevated IL-8 and TNFα transcript levels following staphylococcus infection, with the results for Il-8 being confirmed by RT-qPCR analysis [7]. This evidence concerns the gene TNF and staphylococcus aureus infection.