Protective response to subunit vaccination against intranasal and challenge.

and are Gram-negative pathogenic bacteria, responsible for the diseases glanders and melioidosis, respectively. Furthermore, there is currently no vaccine available against these species. In this study, we aimed to identify protective proteins against these pathogens. Immunization with recombinant Hcp1 (type VI secreted/structural protein), BimA (autotransporter protein), BopA (type III secreted protein), and LolC (ABC transporter protein) generated significant protection against lethal inhaled ATCC23344 and 1026b challenge. Immunization with BopA elicited the greatest protective activity, resulting in 100% and 60% survival against and challenge, respectively. Moreover, sera from recovered mice demonstrated reactivity with the recombinant proteins. Dendritic cells stimulated with each of the different recombinant proteins showed distinct cytokine patterns. In addition, T cells from immunized mice produced IFN-γ following re-stimulation. These results indicated therefore that it was possible to elicit cross-protective immunity against both and by vaccinating animals with one or more novel recombinant proteins identified in .