The levels of gαi (guanine nucleotide-binding protein G(i) subunit alpha), gβγ (guanine nucleotide-binding protein subunit beta-5), myd88 (myeloid differentiation factor 88), traf2 (tumor necrosis factor receptor-associated factor 2) and traf7 mRNAs were notably up-regulated at three or four time points after 24 h of infection, respectively (P<0.05). This evidence concerns the gene CFB and infection.