TLR2 and infection: In order to analyze the role of TLR2 and TLR4 in the control of B. microti infection, WT B10, TLR2−/−, TLR4−/− and TLR2×4−/− mice were infected ip with a sublethal dose (105 cfu) of B. microti and bacterial load was determined in spleen and liver 3, 7, 14, and 21 days after infection.