“…Due to this heterogeneity of the non-JP2 members of A. actinomycetemcomitans, we cannot comment on the stability of colonization with these types. However, colonization stability similar to that observed for the JP2 clone in this study was reported previously for non-JP2 genotypes and different serotypes of A. actinomycetemcomitans (Saarela et al, 1992(Saarela et al, , 1999van der Reijden et al, 2008), and the differences demonstrated in pathogenic potential (Bueno et al, 1998;Haubek et al, 2001Haubek et al, , 2004Haubek et al, , 2008 are apparently not reflected in differences in colonization patterns. More than half of the individuals carrying the JP2 clone at baseline were colonized only transiently, and only very few (2%) were infected after baseline within the two-year period.…”