Which microorganism likes to colonize dental equipment?

• A. Pseudomonas aeruginosa
• B. Staphylococcus aureus
• C. Streptococcus pyogenes
• D. Escherichia coli

Answer: (A)

Pseudomonas aeruginosa is adept at sticking to moist, artificial surfaces and forming biofilms. In dental settings, it readily colonizes components like dental unit waterlines, hoses, and suction systems, where the slimy biofilm protects it from many disinfectants and lets it persist between cleanings. This combination of thriving in moist environments and forming resilient biofilms makes it a classic dental-equipment colonizer. The other organisms are more commonly associated with human carriage or infections (skin/nasal for Staphylococcus aureus; throat/skin for Streptococcus pyogenes; gut flora for Escherichia coli) and aren’t characteristically tied to persistent dental equipment contamination.