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According to the Centers for Disease Control's recently devised National Strategy for Combating Antibiotic-Resistant Bacteria, Acinetobacter baumannii is a "serious" threat level pathogen. A. baumannii's notoriety stems from the fact that a large number of modern strains are multidrug resistant and persist in the hospital setting, thus causing numerous deaths per year. It is imperative that research focus on a more fundamental understanding of the factors responsible for the success of A. baumannii. Toward this end, our group investigated virulence gene expression patterns in a recently characterized wound isolate, AB5075, using quantitative real-time polymerase chain reaction array. Notably, several genes showed statistically significant upregulation at 37°C compared to 25°C; MviM, Wbbj, CarO, and certain genes of the Bas, Bar, and Csu operons. Additionally, we found that in vitro biofilm formation by Csu transposon insertion mutant strains is attenuated. These findings validate previous reports that suggest a link between the Csu operon and biofilm formation. More importantly, our results demonstrate a successful method for evaluating the significance of previously identified virulence factors in a modern and clinically relevant strain of A. baumannii, thereby providing a path toward a more fundamental understanding of the pathogenicity of A. baumannii.

Evaluation of Virulence Gene Expression Patterns inAcinetobacter baumanniiUsing Quantitative Real-Time Polymerase Chain Reaction Array