Modified Carba NP test for the detection of carbapenemase production in gram-negative rods: optimized handling of multiple samples

The modified Carba NP test presented here may be a valuable tool for laboratories interested in investigating a large number of carbapenemase-producing bacteria in a less-costly way. The test was evaluated against 48 carbapenemase-producing and carbapene-masenon-producing gram-negative bacteria. No false-positive results were obtained, but false-negative results were observed with OXA-23- and GES-carbapenemase-producing isolates. Aeromonas sp. are not testable by Modified Carba NP. (C) 2016 Sociedade Brasileira de Microbiologia. Published by Elsevier Editora Ltda.