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Tibiotarsal joint inflammation in C3H mice inoculated with the N40D10/E9 and B31 strains. C3H mice were inoculated with a different inoculum dose (10, 102, 103, 104 spirochetes) of B31 or N40D10/E9 strains. (A) Two weeks after injection, severe tibiotarsal joint swelling was evident only in mice infected with 103 or 104 of B31. (B) However, severe tibiotarsal joint swelling could be observed in mice infected with 10, 102, 103 or 104 of N40D10/E9.
