Send to

Choose Destination
Vaccine. 2009 Sep 18;27(41):5554-61. doi: 10.1016/j.vaccine.2009.07.034. Epub 2009 Aug 3.

Vaccination with a defined Francisella tularensis subsp. novicida pathogenicity island mutant (DeltaiglB) induces protective immunity against homotypic and heterotypic challenge.

Author information

South Texas Center for Emerging Infectious Diseases and Department of Biology, University of Texas at San Antonio, San Antonio, TX 78249, USA.


Francisella tularensis, an intracellular Gram-negative bacterium, is the causative agent of tularemia and a potential bioweapon. Currently, there is no licensed vaccine against this organism. We have characterized the efficacy of a defined F. tularensis subsp. novicida mutant (DeltaiglB) as a live attenuated vaccine against pneumonic tularemia. Replication of the iglB mutant (KKF235) in murine macrophages was significantly lower than the wild type novicida strain U112, and exhibited an LD(50) greater than 10(6)-fold (>10(7)CFU vs <10CFU) in an intranasal challenge model. Mice immunized with KKF235 intranasally or orally induced robust antigen-specific splenic IFN-gamma recall responses, as well as the production of systemic and mucosal antibodies. Intranasal vaccination with KKF235 protected mice from subsequent homotypic challenge with U112 as well as heterotypic challenge with F. tularensis subsp. holarctica (LVS). Moreover, protected animals also exhibited minimal pathological changes compared with mock-vaccinated and challenged animals. The protection conferred by KKF235 vaccination was shown to be highly dependent on endogenous IFN-gamma production. Most significantly, oral immunization with KKF235 protected mice from a highly lethal subsp. tularensis (SCHU S4) pulmonary challenge. Collectively, these results further suggest the feasibility of using defined pathogenicity island mutants as live vaccine candidates against pneumonic tularemia.

[Indexed for MEDLINE]
Free PMC Article

Supplemental Content

Full text links

Icon for Elsevier Science Icon for PubMed Central
Loading ...
Support Center