1. A bacterial extract obtained from a suspension of bacteria, characterized in that the said bacterium in suspension is a non-pathogenic gram-negative bacterium belonging to the class Betaproteobacteria, the Neisseriaceae subfamily, characterized in that the nucleotide sequence of the 16S rRNA gene of the specified bacterium contains the sequence SEQ ID No.1.2. The bacterial extract according to claim 1, characterized in that said bacterium has at least one plasmid containing the sequence of SEQ ID No.2, or any sequence that is at least 80% identical to the specified sequence of SEQ ID No.2.3. The bacterial extract according to claim 1, characterized in that said bacterium is deposited with CNCM on April 8, 2010 under the number I-4290, or any other mutant of said bacterium. The bacterial extract according to claim 1, characterized in that it is obtained after processing said bacterial suspension to remove intracellular components. The bacterial extract according to claim 4, characterized in that said intracellular components include at least nucleic acids. The bacterial extract according to claim 4, characterized in that it comprises an E0 fraction containing at least membrane proteins, periplasmic proteins and proteins originating from the flagellum. The bacterial extract according to claim 6, characterized in that said membrane proteins are composed of porins, OmpA, lipopolysaccharides and / or lipoproteins. The bacterial extract according to claim 4, characterized in that it comprises an S0 fraction containing at least secreted peptides and proteins and secondary metabolites. The bacterial extract according to claim 4, characterized in that it includes a fraction of ES0 containing1. Бактериальный экстракт, полученный из суспензии бактерий, отличающийся тем, что указанная бактерия в суспензии представляет собой непатогенную грамотрицательную бактерию, принадлежащую классу Betaproteobacteria, подсемейству Neisseriaceae, отличающуюся тем, что нуклеотидная последов
