FIG 3.

Comparative results of the modified Hodge test (MHT) and the Triton Hodge test (THT) for representative carbapenemase-producing clinical isolates. Results were obtained using meropenem (MEM) (10 μg) as the substrate. Strains included P. rettgeri M15973, K. pneumoniae M17047, Acinetobacter baumannii M17232, and K. pneumoniae M17277 (A) and E. cloacae M15736, P. aeruginosa M11041, P. aeruginosa M11757, and P. aeruginosa M13715 (B). p, meropenem was hydrolyzed by the streaked cells; n, meropenem was not hydrolyzed by the streaked cells; u, uninterpretable result (dashed arrow, inhibition of growth of the indicator strain E. coli ATCC 25922).