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Effect of mercury exposure on spirochaetal load. Numbers of Borrelia spirochaetes in ear and tibiotarsal joint from C3H/HeN mice 16 and 44 days after experimental infection with Borrelia burgdorferi N40. Bb, mice infected with B. burgdorferi; BbHg, mice infected with B. burgdorferi and treated with HgCl2 prior to infection. Data represent median values from seven mice in each group. Error bars indicate interquartile range. P-values refer to comparisons using the Mann–Whitney U-test.
