PTGS2 and human African trypanosomiasis: CXCL2, FAS, IDO2, IL1R1, IL20, IL33, OSM and PTGS2 genes may be regulated by ssc-miR181a, and are enriched in the NF-kappa B signaling pathway, cytokine-cytokine receptor interaction, African trypanosomiasis, viral protein interaction with cytokine and cytokine receptor, and the Influenza A pathway.