Table 2. Species common to the healthy and diseased clusters where Tannerella sp. OT286 was also present.

Healthy Cluster 1	Healthy Cluster 2	Diseased Cluster 1	Diseased Cluster 2
Bacteroidetes sp. OT274	Bacteroidetes sp. OT274	Bacteroidetes sp. OT274	Bacteroidetes sp. OT274
Campylobacter gracilis OT623	Campylobacter gracilis OT623
Dialister invisus OT118	Dialister invisus OT118
Parvimonas micros OT111	Parvimonas micros OT111
Prevotella sp. OT317 OT472 OT658	Prevotella sp. OT317 OT472 OT658	Prevotella sp. OT317 OT472 OT658	Prevotella sp. OT317 OT472 OT658
Prevotella sp. OT658 693 714 782	Prevotella sp. OT658 693 714 782	Prevotella sp. OT658 693 714 782	Prevotella sp. OT658 OT693 OT714 OT782
Prevotella nigrescens OT693	Prevotella nigrescens OT693	Prevotella nigrescens OT693	Prevotella nigrescens OT693
Prevotella oris OT311	Prevotella oris OT311
Prevotella tannerae OT466	Prevotella tannerae OT466	Prevotella tannerae OT466	Prevotella tannerae OT466
Streptococcus sp. OT768 OT767 OT758 OT755 OT745 OT734 OT728 OT721 OT707	Streptococcus sp. OT768 OT767 OT758 OT755 OT745 OT734 OT728 OT721 OT707
Streptococcus intermedius and anginosus OT543 OT644	Streptococcus intermedius and anginosus OT543 OT644
Streptococcus intermedius and constellatus OT576 OT644	Streptococcus intermedius and constellatus OT576 OT644
Streptococcus mitis OT069 OT398	Streptococcus mitis OT069 OT398	Streptococcus mitis OT069 OT398	Streptococcus mitis OT069 OT398

In order to select potential helpers for Tannerella sp. OT286 growth we identified organisms that where detected at least in both healthy clusters, whit special emphasis on the organisms that were directly linked to Tannerella sp. OT286. OT numbers follow the HOMD nomenclature.