| http://www.w3.org/ns/prov#value | - An additional problem associated with the use of attenuated Gram negative bacterial vectors has been the difficulty in obtaining a balance between residual virulence of invasive and/or reactogenic vectors (Tacket et al., 1992) and the effective delivery of the bioactive polypeptide, such as a immunogenic construct (Zhu et al., 2006).Accordingly, there is a need for improved bacterial vectors that
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