Fig. 3From: mRNA-Seq reveals the quorum sensing system luxS gene contributes to the environmental fitness of Streptococcus suis type 2Acid resistance trends of SS2 strains at 12 and 24 h. The SS2 bacterial suspension was inoculated in THB liquid medium with pH values of 3.0, 4.0, 5.0, 6.0, 7.0 (adjusted with 6 N HCl), and the growth of each strain was measured at 12 h and 24 h. The growth and survival of mutant strain ΔluxS was significantly decreased in pH 3.0, 4.0 and 5.0 acidic environments compared with wild-type and complemented strain. The columns express the means and standard deviations of three or more experiments. *, significantly different at p < 0.05; **, significantly different at p < 0.01; ***, significantly different at p < 0.001Back to article page