Klebsiella pneumoniae and Acinetobacter baumannii are both major contributors to the global antimicrobial resistance crisis, causing rapidly progressive and often severe infections. Researchers from Vaxdyn SL and collaborators presented efficacy data for K-Vax, an inactivated, LPS-null whole-cell A. baumannii-based vaccine engineered to display conserved K. pneumoniae outer-membrane proteins on the bacterial cell surface.