Skin Infections Quiz

What is the most common bacterial cause of folliculitis, boils, and carbuncles?

• Streptococcus pyogenes

• Staphylococcus aureus

• Propionibacterium acnes

• Pseudomonas aeruginosa

Which characteristic is associated with Staphylococcus aureus?

• Gram-negative cocci in chains

• Ferments mannitol on mannitol salt agar, producing yellow colonies

• Acid-fast bacilli

• Obligate intracellular parasite

Which bacterium is a major microbiota of pilosebaceous units and causes acne vulgaris?

• Mycobacterium leprae

• Propionibacterium acnes

• Clostridium perfringens

• Candida albicans

Which enzyme produced by Streptococcus pyogenes aids in tissue invasion by breaking down blood clots?

• Hyaluronidase

• Streptokinase

• Lipase

• Staphylococcal alpha-toxin

Which toxin produced by Staphylococcus aureus is responsible for the characteristic bullous lesions in impetigo?

• Streptolysin S

• Exfoliative toxin

• Pyocyanin

• Streptokinase

What is the causative agent of leprosy (Hansen’s Disease)?

• Pseudomonas aeruginosa

• Mycobacterium leprae

• Streptococcus pyogenes

• Malassezia furfur

Which form of leprosy is associated with strong cell-mediated immunity (CMI)?

• Lepromatous leprosy

• Tuberculoid leprosy

• Borderline leprosy

• Indeterminate leprosy

Which bacterium is the most common cause of wound and burn infections and is known for producing green pus due to pyocyanin?

• Staphylococcus aureus

• Pseudomonas aeruginosa

• Clostridium perfringens

• Propionibacterium acnes

What is a key feature of Pseudomonas aeruginosa that contributes to its antibiotic resistance?

• Production of exfoliative toxin

• Biofilm formation

• Acid-fast cell wall

• Intracellular growth

Which laboratory method is highly sensitive for identifying bacteria that are difficult to culture?

• Serological test

• Polymerase Chain Reaction (PCR)

• Mannitol salt agar culture

• Tzanck smear