The present invention relates to isolated Porphorymonas gingivalis
polynucleotides. The polynucleotides comprises a contiguous sequence of at
least 20 nucleotides which is identical to a contiguous sequence of at
least 20 nucleotides within a sequence selected from the group consisting
of SEQ. ID. NO. 1 to SEQ. ID. NO. 1120 and sequences complementary
thereto.