Extracellular matrix formation enhances the ability of Streptococcus pneumoniae to cause invasive disease.
During infection, pneumococci exist mainly in sessile biofilms rather than in planktonic form, except during sepsis.However, relatively little is known about how biofilms contribute to pneumococcal pathogenesis.Here, we carried out a biofilm assay on opaque and transparent variants of a clinical serotype 19F strain WCH159.After 4 days incubation, s