CD68 was measured and a statistically significant higher expression was observed for the three bacteria studied at 2 and 24 h of infection compared with the non-infected condition (p < 0.0001); however, statistically significant differences were observed among the serotypes only at 2 h of infection by serotype a over serotype b (p = 0.0087) (Figure 1D). The gene discussed is CD68; the disease is infection.