Table 1.

Representation of S. pyogenes pilus structure encoding in the Fibronectin-Binding, Collagen-Binding, T-Antigen (FCT) genomic region, and its effect on biofilm-forming capacity.

FCT (Fibronectin-Binding, Collagen-Binding, T-Antigen) Type Encoding pili	Biofilm Phenotype
FCT type 1	Strong biofilm, independent of media or pH
FCT type 9	Poor biofilm, under all tested condition
FCT-2, FCT-3, FCT-5, and FCT-6	Biofilm phenotype dependent upon on culture conditions and is triggered by low pH
FCT type 4	Inhomogeneous response to environmental conditions with respect to biofilm formation.