Skin Infections
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Questions and Answers

Match each to its definition

Abscess = lump or swelling on the skin that contains pus - often round and feel painful and warm, the center may be soft Boils (furuncles) = usually painless infection of hair follicles Carubuncles = is a cluster of boils that form a connected area of infection - infection extends into surrounding skin and deep underlying subcutaneous tissue Vesicles = thin-walled sac filled with clear liquid: tiny fluid filled blisters

What are boils (furuncles) and carbuncles examples of?

  • Abscess (correct)
  • Tumor
  • Infection
  • Cyst
  • Which organism is the most common cause of abscesses?

  • Escherichia coli
  • Staphylococcus aureus (correct)
  • Streptococcus pneumoniae
  • Klebsiella pneumoniae
  • Bacterial infection of what results in an abscess?

    <p>hair follicle</p> Signup and view all the answers

    Which of the following are causes of vesicles? (Select all that apply)

    <p>chicken pox</p> Signup and view all the answers

    What is a bullae (bulla)?

    <p>blister on the skin with clear fluid</p> Signup and view all the answers

    What are the causes of bullae? (Select all that apply)

    <p>VZV (Shingles)</p> Signup and view all the answers

    Match each to its definition

    <p>Papule = circumscribed, elevated solid lesion up to 1 cm, may have oblique lighting: acne or bacteria causes Macule = flat, distinct, discolored area of skin. Does not include a change in skin thickness or texture Pustule = skin becomes inflamed due to allergic reaction, poisonous insect bites but most common is acne Pyoderma = papule or pustule that form on the skin, often the etiology is not known – painful</p> Signup and view all the answers

    What is the infectious cause of a macule?

    <p>Tinea Versicolor</p> Signup and view all the answers

    What is Pyoderma gangrenosum?

    <p>A rare condition with large painful sores (ulcers) that mostly develop on the legs</p> Signup and view all the answers

    What can cause pyoderma gangrenosum?

    <p>Overactivation of the immune system</p> Signup and view all the answers

    Match each to its definition

    <p>Petechiae = pinpoint spots caused by breaks in capillaries: infections (CMV) and reactions to medications Purpura = red, purple or brown spots on skin due to blood vessel leakage Exanthem = following virus infections; Spots, bumps or blotches on skin; Some are flat and red others are scaly and can be bumpy; May or not be itchy; Measles, mumps, rubella and chickenpox – vaccine preventable Plaques = raised red patches covered with a whitish buildup of dead skin cells called the scale</p> Signup and view all the answers

    Match each childhood exanthem to its cause

    <p>Scarlet fever = streptococcus Filatov-Dukes = staph Erythema infectiosum (fifth disease) = parvovirus 19 Roseola infantum (Sixth) = HHV6 or 7</p> Signup and view all the answers

    What is rubella commonly known as?

    <p>German measles</p> Signup and view all the answers

    What is psoriasis?

    <p>A skin condition causing red, thick, scaly, and flaky skin</p> Signup and view all the answers

    Match each skin condition to its causative agent

    <p>Folliculitis/ Scalded skin syndrome = Staphylococcus aureus Erysipelas = streptococcus pyogenes Acne = Propionibacterium acnes Impetigo = Strep or staph</p> Signup and view all the answers

    What does fasciitis involve in addition to infection of the fasciae?

    <p>Inflammation in connective tissue</p> Signup and view all the answers

    What causes necrotizing fasciitis?

    <p>Group A Strep (Streptococcus pyogenes)</p> Signup and view all the answers

    What are rare complications of erysipelas? (Select all that apply)

    <p>Septicemia</p> Signup and view all the answers

    Erysipelas is more superficial, raised, and demarcated than cellulitis.

    <p>True</p> Signup and view all the answers

    What kind of skin condition does Pseudomonas aeruginosa cause?

    <p>Hot tub folliculitis</p> Signup and view all the answers

    Match each acne category to its definition

    <h1>Comedonal acne = inflammation of hair follicles and sebaceous glands Inflammatory acne = bacteria caused: propionibacterium acnes Nodular cystic acne = scaring cysts</h1> Signup and view all the answers

    What causes gas gangrene?

    <p>Clostridium perfringens</p> Signup and view all the answers

    What is gas gangrene usually associated with?

    <p>Deep wound</p> Signup and view all the answers

    What is the typical onset time for gas gangrene after an injury?

    <p>12-48 hours post injury</p> Signup and view all the answers

    What is a sign of H+ gas presence in gas gangrene?

    <p>crepitant tissue</p> Signup and view all the answers

    Which of the following are characteristic of gas gangrene? (Select all that apply)

    <p>Snap, crackle and popping sounds</p> Signup and view all the answers

    What is the treatment for gas gangrene? (Select all that apply)

    <p>Hyperbaric chamber</p> Signup and view all the answers

    What is the course of a cutaneous anthrax lesion?

    <p>Papule --&gt; Vesicular --&gt; 1-2 days ulcerative --&gt; 2-5 days depressed black eschars</p> Signup and view all the answers

    What is the causative agent of erythrasma?

    <p>Corynebacterium minutissimum</p> Signup and view all the answers

    Where does erythrasma typically develop?

    <p>Warm, moist regions of the skin</p> Signup and view all the answers

    What causes actinomycetoma?

    <p>Nocardia species</p> Signup and view all the answers

    What is the usual site of actinomycetes?

    <p>Feet</p> Signup and view all the answers

    Match each to its causative agent and description

    <p>Rubella = Rubella virus; mild red rash on face, trunk and limbs, dangerous in pregnancy Measles = Rubeola Virus; Severe infection with fever, conjunctivitis, cough and rash Chickenpox = Varicella- zoster virus; generalized itchy rash that develops into vesicles Smallpox = Smallpox virus; fluid-filled bumps that are dimpled in the middle</p> Signup and view all the answers

    Match each to its causative agent and characteristics

    <h1>Shingles = Varicella-zoster virus; pain and skin lesions usually on the trunk Warts = Human papillomavirus; Small growths on the skin or mucous membranes</h1> <p>=</p> Signup and view all the answers

    What is known as hard measles and lasts approximately 3 weeks?

    <p>Rubeola</p> Signup and view all the answers

    What type of cells does rubeola (measles) infect?

    <p>CD4 T cells</p> Signup and view all the answers

    What is a characteristic of Rubeola?

    <p>Koplik spots</p> Signup and view all the answers

    What occurs one day after Koplik spots?

    <p>Rash</p> Signup and view all the answers

    What is a characteristic of measles?

    <p>Maculopapular rash</p> Signup and view all the answers

    What is a rare side effect of measles?

    <p>Subacute sclerosing panencephalitis (SSPE)</p> Signup and view all the answers

    What can the chickenpox virus spread through?

    <p>Respiratory tract</p> Signup and view all the answers

    Where does the shingles virus reside?

    <p>Dorsal root ganglia</p> Signup and view all the answers

    What can HSV-1 infection lead to (rare)?

    <p>Cornea damage and blindness</p> Signup and view all the answers

    What produces warts?

    <p>Excess amount of keratin development in epidermis</p> Signup and view all the answers

    What kinds of lesions do dermatophytes cause?

    <p>Dry, scaly lesions on various parts of the skin</p> Signup and view all the answers

    What are the initial lesions of candidiasis?

    <p>Erythematous papules</p> Signup and view all the answers

    What can candidiasis cause in immune compromised patients?

    <p>Mucocutaneous candidiasis</p> Signup and view all the answers

    What are dermatophytes classified according to?

    <p>Inflammatory response</p> Signup and view all the answers

    Which of the following dermatophyte types produces inflammatory diseases?

    <p>Zoophilic</p> Signup and view all the answers

    Which dermatophyte type causes non-inflammatory diseases or mild inflammation?

    <p>Anthrophophilic</p> Signup and view all the answers

    What is the most common type of dermatophyte?

    <p>Anthrophophilic</p> Signup and view all the answers

    What do all forms of dermatophytosis involve?

    <p>Erythema, induration, itching, scaling</p> Signup and view all the answers

    Which layer of skin is invaded by hyphae in dermatophytosis?

    <p>Stratum corneum</p> Signup and view all the answers

    Ringworm is caused by dermatophytes.

    <p>True</p> Signup and view all the answers

    Match each dermatophyte group to its description

    <h1>Trichophyton = infections of skin, hair, and nails;Long, unbdulant, branching hyphae. Many septa present and form barrel-shaped arthrospores; Rubrum – most widely distributed in humans; Chronic infections of skin, nails, rarely scalp: granulomatous lesions may occur Microsporum = infections of skin and hair; Canis is zoophilic with worldwide distribution frequently cause ringworm in children; cats and dogs are main source of infection; Spindle-shaped macroconidia with rough thick walls Epidermophyton = causes infections on skin and nails; Floccosum – causes tinea pedis, cruis, corporis, and onychomycosis; does not invade hair; Slow growing, club-shaped macroconidia, absence of microconidia; Macroconidia cluster in 2 or 3</h1> Signup and view all the answers

    How is Leishmaniasis transmitted?

    <p>From rodent to human via sand fly</p> Signup and view all the answers

    Which of the following cutaneous infections has the listed pathogenesis:

    -Lesions on extremities or face -Week – months incubation -Itchy pustules -Heals spontaneously: 5-12 months -No treatment?

    <p>Leishmaniasis</p> Signup and view all the answers

    What is the most common eye infection?

    <p>Conjunctivitis</p> Signup and view all the answers

    What can washing contact lenses in contaminated water lead to?

    <p>Lens keratitis</p> Signup and view all the answers

    What is the leading eye infection in underdeveloped countries?

    <p>Trachoma</p> Signup and view all the answers

    What pathogen causes trachoma?

    <p>Chlamydia trachomatis</p> Signup and view all the answers

    What can trachoma lead to?

    <p>Chronic conjunctivitis</p> Signup and view all the answers

    What causes river blindness?

    <p>Onchocerca volvulus</p> Signup and view all the answers

    What is river blindness spread by?

    <p>blood-sucking blackfly</p> Signup and view all the answers

    Which part of the eye does the blood-sucking blackfly that causes river blindness invade?

    <p>Anterior chamber</p> Signup and view all the answers

    What can river blindness cause?

    <p>Corneal ulceration, fibrosis and blindness</p> Signup and view all the answers

    What organism transmits loaiasis?

    <p>African rain forest deer fly</p> Signup and view all the answers

    What can be used for infections caused by Pseudomonas?

    <p>Fluoroquinolones</p> Signup and view all the answers

    Which of the following can infect the eyes of newborns?

    <p>Chlamydia trachomatis</p> Signup and view all the answers

    What pathogen is the most common cause of osteomyelitis?

    <p>Staphylococcus</p> Signup and view all the answers

    What is the most common site of osteomyelitis infection?

    <p>Metaphysis</p> Signup and view all the answers

    Which strep strain accounts for the most cases of osteomyelitis?

    <p>Beta hemolytic</p> Signup and view all the answers

    Which groups does streptococcus induced osteomyelitis usually affect? (Select all that apply)

    <p>Neonates</p> Signup and view all the answers

    Which of the following can also cause osteomyelitis? (Select all that apply)

    <p>Haemophilus influenzae</p> Signup and view all the answers

    Which group presents with atypical presentations of osteomyelitis?

    <p>Neonates (up to 4 weeks)</p> Signup and view all the answers

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