What term describes binding interactions between different oral bacteria that enable multi-species aggregates?

What term describes binding interactions between different oral bacteria that enable multi-species aggregates?

• A. Adherence
• B. Quorum sensing
• C. Biofilm maturation
• D. Coaggregation

Answer: (D)

Coaggregation is the specific binding between different bacterial species that allows them to stick together and form mixed‑species aggregates in the oral biofilm. In dental plaque, different microbes contribute unique surface molecules that recognize complementary receptors on other species, creating interspecies bridges. For example, certain early colonizers can attach to a surface and then recruit other species through adhesins and receptor interactions, with organisms like Fusobacterium nucleatum acting as a bridge between early and later colonizers. This interspecies binding is what drives the formation of multi-species communities, beyond what a single species could achieve alone. Adherence refers more broadly to a bacterium attaching to a surface or host tissue, not necessarily to another microbe. Quorum sensing is about chemical signaling that coordinates gene expression based on population density, not direct physical binding. Biofilm maturation describes progression to a more complex, matrix‑rich structure, not the specific interspecies binding that creates mixed aggregates.

Coaggregation is the specific binding between different bacterial species that allows them to stick together and form mixed‑species aggregates in the oral biofilm. In dental plaque, different microbes contribute unique surface molecules that recognize complementary receptors on other species, creating interspecies bridges. For example, certain early colonizers can attach to a surface and then recruit other species through adhesins and receptor interactions, with organisms like Fusobacterium nucleatum acting as a bridge between early and later colonizers. This interspecies binding is what drives the formation of multi-species communities, beyond what a single species could achieve alone.

Adherence refers more broadly to a bacterium attaching to a surface or host tissue, not necessarily to another microbe. Quorum sensing is about chemical signaling that coordinates gene expression based on population density, not direct physical binding. Biofilm maturation describes progression to a more complex, matrix‑rich structure, not the specific interspecies binding that creates mixed aggregates.