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Questions and Answers
Which of the following genera includes species that are typically coagulase-negative?
Which of the following genera includes species that are typically coagulase-negative?
- Propionibacterium
- Staphylococcus (correct)
- Streptococcus
- Corynebacterium
A patient's skin culture reveals the presence of Corynebacterium spp. Which of the following characteristics is most indicative of this genus?
A patient's skin culture reveals the presence of Corynebacterium spp. Which of the following characteristics is most indicative of this genus?
- Gram-negative cocci
- Gram-positive rods (correct)
- Anaerobic growth
- Production of coagulase
Propionibacterium spp. are often associated with acne due to their metabolic activity. What byproduct of their metabolism contributes to this condition?
Propionibacterium spp. are often associated with acne due to their metabolic activity. What byproduct of their metabolism contributes to this condition?
- Butyric acid
- Propionic acid (correct)
- Acetic acid
- Lactic acid
Malassezia spp. are a common component of the skin microbiota. Which of the following best describes this genus?
Malassezia spp. are a common component of the skin microbiota. Which of the following best describes this genus?
Which of the following organisms is least likely to establish long-term colonization on dry skin?
Which of the following organisms is least likely to establish long-term colonization on dry skin?
A patient is identified as a carrier of Staphylococcus aureus on their skin. What does this imply?
A patient is identified as a carrier of Staphylococcus aureus on their skin. What does this imply?
Which of the following genera is characterized by Gram-positive cocci arranged in irregular clusters and is often found on the skin?
Which of the following genera is characterized by Gram-positive cocci arranged in irregular clusters and is often found on the skin?
A healthcare worker routinely uses sanitizers. Which organism is most likely to persist on their skin despite regular sanitization?
A healthcare worker routinely uses sanitizers. Which organism is most likely to persist on their skin despite regular sanitization?
A patient with compromised skin barrier function is most susceptible to colonization by which of the following organisms?
A patient with compromised skin barrier function is most susceptible to colonization by which of the following organisms?
A patient tests positive for Streptococcus pyogenes via culture of their skin. What does this finding suggest about the patient’s condition?
A patient tests positive for Streptococcus pyogenes via culture of their skin. What does this finding suggest about the patient’s condition?
Flashcards
Coagulase-negative staphylococci
Coagulase-negative staphylococci
Staphylococcus species that do not produce coagulase, such as S. epidermidis.
Corynebacterium spp.
Corynebacterium spp.
Gram-positive bacteria, often club-shaped, part of normal skin flora.
Propionibacterium spp.
Propionibacterium spp.
Gram-positive bacteria that produce propionic acid.
Micrococcus spp.
Micrococcus spp.
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Malassezia spp.
Malassezia spp.
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Candida spp.
Candida spp.
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Acinetobacter spp.
Acinetobacter spp.
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Study Notes
- Normal skin flora includes bacteria and fungi.
Gram-Positive Bacteria
- Coagulase-negative staphylococci such as S. epidermidis and S. hominis are part of the normal skin flora.
- Corynebacterium spp. are present.
- Propionibacterium spp. are present.
- Micrococcus spp. are present.
- Staphylococcus aureus can exist in a carrier state on the skin.
- Streptococcus pyogenes can exist in a carrier state on the skin.
Gram-Negative Bacteria
- Acinetobacter spp. are present.
- Escherichia coli can colonize, but is rare and transient due to dry skin, and can be easily removed.
Fungi
- Candida spp. are present.
- Malassezia spp. are present.
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