Patent ID: 7029845

Claim:
An isolated DNA which is specific to Neisseria meningitidis (Nm) and Neisseria gonorrheae (Ng), and hybridizes on a Southern blot to SEQ ID NO:95 and does not hybridize on a Southern blot to a DNA sequence of Neisseria lactamica (Nl) strain Nl8064, under the following hybridization conditions: 18 h at 65° C., with a solution comprising 0.5 M NaPO 4 pH 7.2, 0.001 M EDTA-Na, 1% bovine serum albumin and 7% sodium dodocylsulphate, followed by at least two washes in a solution comprising 40 mM Na PO 4 pH 7.2, 1 mM EDTA, and 1% SDST, the final wash being conducted at 85° C. for 5 minutes, or the complement of said isolated DNA which is specific to Neisseria meningitidis (Nm) and Neisseria gonorrheae (Ng), provided that said DNA or the complement of said isolated DNA is not pilC, or a gene involved in the biosynthesis of any one of the polysaccharide capsule, IgA proteases, pilin, a protein which binds transferin, a protein which binds lactoferin, and an opacity protein said DNA being within an islet involved in the polonization of the nasopharynx or invasion of the submucousal space or systemic dissemination of Nm.