PPARD and infection: PPARβ/δ agonist and cPLA2 antagonist did not increase PGE2 production; even its production diminished (P < 0.05 and P < 0.001) at 120 min after infection, respectively; moreover, PPAR agonists and cPLA2 antagonist significantly increased PGF2α production (P < 0.001) at 60 and 120 min after infection, respectively.