Thus, our study found no evidence that bank voles with different TLR2 genotypes (C1C1, C2C2, C3C3) differed in their susceptibility to infection with B. afzelii. One limitation of this study was the small sample size for the C2C2 genotypes (n = 12), which limits our power to detect differences in susceptibility to B. afzelii infection between the susceptible (C1C1) and resistant (C2C2) genotypes. This evidence concerns the gene TLR2 and infection.