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. 2006 Oct 9;74(12):6750–6760. doi: 10.1128/IAI.01160-06

FIG. 6.

FIG. 6.

Sera from B. hermsii-challenged C57BL/6 mice can clear high levels of spirochetes in recipient MyD88-deficient mice. Pooled sera (300 μl) from naïve C57BL/6 mice (non-imm sera), C57BL/6 mice infected with B. hermsii for 6 days (6d sera), or C57BL/6 mice infected with B. hermsii for 9 weeks (9wk sera) were transferred to B. hermsii-infected MyD88-deficient mice 72 h after infection. Survival and B. hermsii levels in the blood were monitored as described in the legend to Fig. 1. Shown are B. hermsii levels in blood of one C57BL/6 mouse, representative of three mice (A), B. hermsii levels in blood of five MyD88-deficient mice receiving nonimmune sera from C57BL/6 mice (B), three MyD88-deficient mice receiving sera from 6d B. hermsii-challenged C57BL/6 mice (C), and four MyD88-deficient mice receiving sera from 9wk B. hermsii-challenged C57BL/6 mice (D). Results shown are representative of two separate experiments. Samples that were PCR negative for B. hermsii DNA in panel D are plotted as 102 B. hermsii per μl of blood based on sensitivity of the assay.