The Francisella tularensis pathogenicity island encodes a secretion system that is required for phagosome escape and virulence.
Barker JR, Chong A, Wehrly TD, Yu JJ, Rodriguez SA, Liu J, Celli J, Arulanandam BP, Klose KE. The Francisella tularensis pathogenicity island encodes a secretion system that is required for phagosome escape and virulence. Mol Microbiol. 2009 Dec; 74(6):1459-70.