Which organism is noted for producing catalase and protecting S. mutans from hydrogen peroxide oxidative stress with adherence?

Which organism is noted for producing catalase and protecting S. mutans from hydrogen peroxide oxidative stress with adherence?

• A. Candida albicans
• B. Streptococcus mitis
• C. Actinomyces naeslundii
• D. Veillonella parvula

Answer: (D)

The key idea is how certain oral bacteria detoxify reactive oxygen species to support a cooperative biofilm. Veillonella parvula is a catalase-positive anaerobe in dental plaque, meaning it can break down hydrogen peroxide into water and oxygen. Hydrogen peroxide is produced by some streptococci in the same biofilm and can stress or inhibit neighboring microbes. By producing catalase, Veillonella parvula reduces this oxidative stress, allowing Streptococcus mutans to persist and adhere within the plaque. This protective, co-adherent interaction helps maintain a stable, multispecies community.

The key idea is how certain oral bacteria detoxify reactive oxygen species to support a cooperative biofilm. Veillonella parvula is a catalase-positive anaerobe in dental plaque, meaning it can break down hydrogen peroxide into water and oxygen. Hydrogen peroxide is produced by some streptococci in the same biofilm and can stress or inhibit neighboring microbes. By producing catalase, Veillonella parvula reduces this oxidative stress, allowing Streptococcus mutans to persist and adhere within the plaque. This protective, co-adherent interaction helps maintain a stable, multispecies community.