THE INVENTION RELATES TO A METHOD OF REDUCING THE INCIDENCE OR SEVERITY OF A DISEASE OR CONDITION IN A SUBJECT, SAID DISEASE OR CONDITION BEING ONE ASSOCIATED WITH THE PRESENCE OF A MICROBIAL PATHOGEN IN AN ORAL TISSUE OF A SUBJECT, AND INCLUDING THE USE OF A COMPOSITION FORMING AN ANTI-MICROBIAL AND AN IMMUNOGEN AGAINST A MICROBIAL PATHOGEN.