Respiratory quinolones can eradicate amoxicillin-induced mature biofilms and nontypeable Haemophilus influenzae in biofilms

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Abstract

Biofilm is thought to be involved in the persistent bacterial infections caused by nontypeable Haemophilus influenzae (NTHi). This study aims to evaluate the efficacy of antibiotics against NTHi biofilms.

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The biofilm matrix.

Hans-Curt Flemming, Jost Wingender (2010)

The microorganisms in biofilms live in a self-produced matrix of hydrated extracellular polymeric substances (EPS) that form their immediate environment. EPS are mainly polysaccharides, proteins, nucleic acids and lipids; they provide the mechanical stability of biofilms, mediate their adhesion to surfaces and form a cohesive, three-dimensional polymer network that interconnects and transiently immobilizes biofilm cells. In addition, the biofilm matrix acts as an external digestive system by keeping extracellular enzymes close to the cells, enabling them to metabolize dissolved, colloidal and solid biopolymers. Here we describe the functions, properties and constituents of the EPS matrix that make biofilms the most successful forms of life on earth.

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Bacterial biofilms: a common cause of persistent infections.

J Costerton, P S Stewart, E Greenberg (1999)

Bacteria that attach to surfaces aggregate in a hydrated polymeric matrix of their own synthesis to form biofilms. Formation of these sessile communities and their inherent resistance to antimicrobial agents are at the root of many persistent and chronic bacterial infections. Studies of biofilms have revealed differentiated, structured groups of cells with community properties. Recent advances in our understanding of the genetic and molecular basis of bacterial community behavior point to therapeutic targets that may provide a means for the control of biofilm infections.