Adenovirus-based prime-boost immunization for rapid vaccination against anthrax.

Area of Science:

• Immunology
• Vaccinology
• Microbiology

Background:

• Prime-boost vaccination strategies are effective against viral pathogens.
• The efficacy of prime-boost vaccination against bacterial diseases, such as anthrax, remains unevaluated.

Purpose of the Study:

• To assess the effectiveness of prime-boost vaccination strategies for anthrax immunization.
• To compare DNA/adenovirus prime-boost vaccination with single-modality vaccination and existing anthrax vaccines.

Main Methods:

• Mice were immunized using prime-boost strategies with plasmid DNA and adenovirus vectors expressing Bacillus anthracis protective antigen (PA) domain four.
• Humoral and cellular immune responses were analyzed, including antibody titers, toxin-neutralizing activity, and interferon-gamma secretion.
• Vaccinated mice were challenged with Sterne strain anthrax spores to evaluate protection.

Main Results:

• DNA-primed/adenovirus-boosted mice exhibited higher antibody and toxin-neutralizing titers compared to single-modality vaccination or Anthrax Vaccine Adsorbed.
• A robust antigen-specific cell-mediated immune response, indicated by interferon-gamma secretion, was observed.
• Both DNA-primed/adenovirus-boosted and adenovirus-primed/adenovirus-boosted regimens conferred full protection against anthrax spore challenge.

Conclusions:

• Adenovirus-based prime-boost vaccination provides rapid and effective protection against anthrax.
• This vaccination approach holds promise for protecting against bacterial pathogens, in addition to viral ones.