Eucalyptus polybractea (Blue Mallee) yields one of the highest-cineole essential oils within the genus, with 1,8-cineole comprising approximately 82.95% of the oil and conferring potent antimicrobial activity across a broad spectrum of pathogens. Among several Western Australian eucalyptus species tested, E. polybractea and E. globulus oils showed the highest inhibitory activity against clinically relevant bacteria, including Acinetobacter baumannii, at concentrations of 0.25-8.0% v/v.^[1]