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WorksheetsSkin Infections Quiz
Total questions: 25
Worksheet time: 13mins
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
Which fungal infection is associated with hypo- or hyperpigmented scaly patches, often on the trunk?
Candidiasis
Tinea pedis
Pityriasis versicolor
Tinea capitis
What is the causative agent of pityriasis versicolor?
Candida albicans
Malassezia furfur
Trichophyton rubrum
Mycobacterium leprae
Which medium is commonly used to culture fungi for diagnosing fungal skin infections?
Mannitol salt agar
Sabouraud Dextrose Agar
Blood agar
MacConkey agar
Which factor increases the risk of candidiasis?
Cold, dry environments
Immunosuppression
Low humidity
Strong cell-mediated immunity
What is a characteristic feature of measles during the prodromal phase?
Slapped cheek rash
Koplik spots
Bullous lesions
Lace-like rash
What is a potential complication of varicella-zoster virus reactivation later in life?
Congenital rubella syndrome
Shingles (herpes zoster)
Hydrops fetalis
Oral thrush
Which virus is associated with a "slapped cheek" rash in erythema infectiosum?
Coxsackievirus A16
Parvovirus B19
Human Papillomavirus (HPV)
Enterovirus 71
What is the primary mode of transmission for hand, foot, and mouth disease?
Blood transfusion
Direct contact with respiratory secretions or blister fluid
Insect vectors
Contaminated food
Which HPV strains are associated with a higher risk of causing cancers, such as cervical cancer?
HPV types 6 and 11
HPV types 16 and 18
HPV types 1 and 2
HPV types 31 and 33
Which diagnostic method can detect multinucleated giant cells with Cowdry type A intranuclear inclusion bodies in herpes infections?
Tzanck smear
Sabouraud Dextrose Agar culture
Mannitol salt agar culture
ELISA
What is a common source of skin infections from contaminated objects?
Mosquito bites
Shared towels or medical instruments
Respiratory droplets
Normal skin flora
Which bacterium is an example of an environmental source of wound infections?
Propionibacterium acnes
Clostridium perfringens
Streptococcus pyogenes
Malassezia furfur
Which feature of Mycobacterium leprae makes it difficult to culture in vitro?
Biofilm formation
Obligate intracellular parasite
Production of pyocyanin
β-hemolytic activity
What is a predisposing factor for pityriasis versicolor?
Cold, dry environments
Warm and humid environments
Strong cell-mediated immunity
Low oily skin content
Which laboratory method involves treating a skin scraping with KOH to observe fungal elements?
Serological test
Microscopy
Viral culture
Mannitol salt agar culture
