What are biofilms made of? :
Biofilm is a generic term used to describe a sludge like material that develops in association with organic materials. Biofilms result from a variety of sources, and negatively impact a number of industrial and medical applications. A Biofilm is composed of a densely packed group of microorganisms. A key property of biofilms is that individual microorganisms are bound together by a polymeric substance excreted by the microorganisms. This polymeric substance forms an adhesive matrix that holds the biofilm together, allows it to attach to surfaces, and can serve as an encapsulation which protects the colony forming the biofilm. This protective encapsulation is believed to play a role in some antibiotic-resistant infections.
The polymeric substance excreted by the microorganisms is known as an extracellular polymeric substance (EPS). It is also commonly called an extracellular adhesive matrix.
A key aspect of biofilms is a complex interaction among the constituent microorganisms. A biofilm forms when individual microorganisms cease to exhibit individual, free floating behavior, and begin to associate with each other, and a surface, and begin to act in concert with each other. A biofilm grows by both simple cell division, and by new free floating microorganisms associating with the developing biofilm. (Quote from Bacteriaworld.com)
In relation to Lyme, this means it is a slime that is created by microorganisms that were created by the Borrelia bacteria to protect itself.