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Metronidazole treatment failure rates over a recent 3-year period (2006-2008) were 13.7% (7 of 51 patients), compared with 11.7% (7 of 60 patients) between 1998 and 2005. Moreover, the recurrence rate after successful metronidazole treatment over the 3-year period from 2006 to 2008 was 19.0% (8 of 42 patients), and the rate between 1998 and 2005 was 9.1% (5 of 55 patients).
