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The three-dimensional inoculation (arrow) resulted in minor distortions that indicated antibiotic inactivation (i.e., positive three-dimensional test results) at the intersection with the zone margins of cefamandole (D), cefoperazone (E), CTX (F), and ceftriaxone (G). Distortions did not occur in tests with aztreonam (B), imipenem (C), or cefoxitin (I). The inhibition zones were too small to interpret in the direct three-dimensional test in tests with piperacillin (A) and CAZ (H).
