TLR2 and infection: Additionally, lower levels of IFN-γ and IL-12 were detected in the peritoneal exudate cells from TLR2-/- mice than in the same cells from TLR2+/+ mice at day 5 post infection [6], resulting in an increased parasite burden in the lungs of TLR2-/- mice intraperitoneally injected with 100 cysts from the Fukaya strain [4].