PTGS2 and infection: As shown in Table 2, several genes were significantly upregulated (Pla2g4a, Pla2g4c, Pla2g7, Ptgs1, Ptgs2, Pla1, Tbxas1) or downregulated (Alox5, Pla2g2d, Pla2g1b, Pla2g4b, Pla2g4f) during infection.