Questions: 20 Multiple Choice S. epidermidis, which produces the water-soluble pigments pyoverdine and pyocyanin. S. pyogenes, which produces a water-soluble blue-green capsule. P. aeruginosa, which produces multiple water-soluble pigments that are green. P. aeruginosa, which produces the water-soluble pigments pyoverdin and pyocyanin. either S. epidermidis or S. aureus, both of which produce pigments. A patient presents with a wound that contains green pus. This suggests to you that the wound is infected with

The answer is the fourth one (D): P. aeruginosa, which produces the water-soluble pigments pyoverdin and pyocyanin.

Explanation for each option:

1. S. epidermidis, which produces the water-soluble pigments pyoverdine and pyocyanin.

   • Incorrect. S. epidermidis does not produce these pigments. Pyoverdine and pyocyanin are associated with P. aeruginosa.

2. S. pyogenes, which produces a water-soluble blue-green capsule.

   • Incorrect. S. pyogenes does not produce a blue-green capsule or pigments. It is known for causing streptococcal infections and producing hemolysins.

3. P. aeruginosa, which produces multiple water-soluble pigments that are green.

   • Partially correct. P. aeruginosa does produce green pigments, but the specific pigments are pyoverdin and pyocyanin.

4. P. aeruginosa, which produces the water-soluble pigments pyoverdin and pyocyanin.

   • Correct. P. aeruginosa is known for producing these pigments, which can give a green color to pus.

5. either S. epidermidis or S. aureus, both of which produce pigments.

   • Incorrect. While S. aureus can produce a golden pigment, neither S. epidermidis nor S. aureus produce green pigments.

Summary: A patient presenting with a wound that contains green pus suggests an infection with P. aeruginosa, which produces the water-soluble pigments pyoverdin and pyocyanin.