Considering the IL6 SNP, the GC heterozygotes were significantly associated with toxoplasmosis and increased the risk of T. gondii infection [odds ratio (OR) 4.24, 95 % confidence interval (CI) 1.24–14.50 in the codominant model, and OR 3.56, 95 % CI 1.19–10.64 for GC and CC genotypes in the dominant model; p ≤ 0.050; see Table 3]. The gene discussed is IL6; the disease is toxoplasmosis.