What percentage of bacterial species in biofilms do Veillonella make up?

• A. 10%
• B. 5%
• C. 15%
• D. 20%

Answer: (A)

Veillonella is a moderate, persistent member of oral biofilms. In mature dental plaque, this genus thrives by consuming lactate produced by early colonizers like streptococci, creating a useful cross-feeding interaction that helps stabilize the community. Because of this ecological role, Veillonella appears across many biofilm surveys but does not dominate; it typically accounts for about one-tenth of the species detected. That around-10% figure is why the option stating 10% is the best choice. The other percentages would imply a much smaller or much larger share than what is commonly observed for Veillonella in oral biofilms.