Outbreak of Carbapenem-Resistant <i>Acinetobacter baumannii</i> Producing the OXA-23 Enzyme in Curitiba, Brazil

Carbapenem-resistant Acinetobacter baumannii isolates were obtained from eight patients in two hospitals in Curitiba, Brazil. The isolates were multiresistant, belonged to a single strain, and produced the OXA-23 carbapenemase. Treatment options were limited, although the isolates were susceptible to polymyxin B in vitro. The strain contributed to the deaths of five patients.