Attenuated salmonella SP12 mutants as antigen carriers

Drug – bio-affecting and body treating compositions – Antigen – epitope – or other immunospecific immunoeffector

Reexamination Certificate

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C435S007200, C435S007350

Reexamination Certificate

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07955600

ABSTRACT:
The present invention relates to vaccines, in particular, to an attenuated gram-negative cell comprising the SPI2 gene locus, wherein at least one gene of the SPI2 locus is inactivated, wherein said inactivation results in an attenuation/reduction of virulence compared to the wild type of said cell, and to a carrier for the presentation of an antigen to a host, which carrier is said attenuated gram-negative cell, wherein said cell comprises at least one heterologous nucleic acid molecule comprising a nucleic acid sequence coding for said antigen, wherein said cell is capable of expressing said nucleic acid molecule or capable of causing the expression of said nucleic acid molecule in a target cell.

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