Abstract
We tested the in vitro activity of ampicillin, ampicillin-sulbactam, cefoperazone, cefoperazone-sulbactam, and sulbactam against 18 recent clinical isolates of Chlamydia trachomatis and two ATCC strains. Ampicillin (MIC 50, 256 μg/ml) and sulbactam (MIC 50, 128 μg/ml) demonstrated some activity against C. trachomatis it, but cefoperazone had little to no activity. At 2–3 dilutions below the MIC, C. trachomatis treated with ampicillin or sulbactam, but not cefoperazone, formed small inclusions that remained small on passage onto antibiotic-free McCoy cells. It appears that ampicillin and sulbactam suppress rather than kill C. trachomatis.
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