IFNG and biological process involved in symbiotic interaction: Results showed that while all groups of mice continued to produce IFN-γ to a comparable degree, only the mice that received 103LdWTLLO parasites showed a significantly reduced IL10 expression relative to 104 and 105 parasite infections (Figure 2F, one way ANOVA, p = 0.0016 and Figure 2G, one way ANOVA, p = 0.0003; Figure S3 in Supplementary Material).