Which statement about biofilms is true?

• A. They are NOT highly susceptible to the body's defense mechanisms.
• B. They are easily removed by hand sanitizers.
• C. They are beneficial to immune response.
• D. They indicate a clean surface.

Answer: (A)

Biofilms are structured communities of microorganisms encased in a sticky protective matrix that attach to surfaces. This setup makes them resistant to the body's defenses. The matrix and the altered state of the bacteria within slow immune cell access and often reduce the bacteria’s metabolic activity, which lowers susceptibility to immune attack and to antiseptics. Because of this, they are not highly susceptible to the body's defense mechanisms.

Hand sanitizers and other cleaners struggle to fully disrupt biofilms, so they are not easily removed by hand sanitizers. They do not help immune response; in fact, biofilms can hinder it and contribute to persistent infections. They do not indicate a clean surface; their presence signals contamination and potential ongoing surface colonization.