Table 6. Results for modified Hodge test evaluation of 312 enterobacterial isolates from 6 US Emerging Infections Program sites, January 1, 2011–January 30, 2014.

Organism, carbapenem used	False-positive results, %	Selected false-negative results
Klebsiella spp.
Meropenem	2.7	0
Ertapenem	2.7	0
Enterobacter spp.
Meropenem	31	0
Ertapenem	34	0
Escherichia coli
Meropenem	3	0
Ertapenem	4	0