Question:
Microbial cause of catheter infection in a young female.
Microbial cause of catheter infection in a young female.
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Skin staphylococcus is the top catheter coloniser among the options.
Updated On: Jun 24, 2026
- S. aureus
- S. viridans
- P. mallei
- P. cepacia
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The Correct Option is A
Solution and Explanation
Step 1: Catheter-related bloodstream infections are dominated by skin commensal bacteria that colonise the catheter surface.
Step 2: By frequency the order is coagulase-negative staphylococci (30 to 40 percent), then Staphylococcus aureus (5 to 10 percent), enterococci, Candida and Pseudomonas aeruginosa. Coagulase-negative staphylococci are not in the option list, so among the choices given the next most common and the best answer is Staphylococcus aureus.
Step 3: Streptococcus viridans, Pseudomonas mallei and Burkholderia cepacia are far less common catheter pathogens, so the answer is S. aureus.
Step 2: By frequency the order is coagulase-negative staphylococci (30 to 40 percent), then Staphylococcus aureus (5 to 10 percent), enterococci, Candida and Pseudomonas aeruginosa. Coagulase-negative staphylococci are not in the option list, so among the choices given the next most common and the best answer is Staphylococcus aureus.
Step 3: Streptococcus viridans, Pseudomonas mallei and Burkholderia cepacia are far less common catheter pathogens, so the answer is S. aureus.
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