Textbook Question
Use the following choices to answer the question given below.
a. Pseudomonas
b. Staphylococcus aureus
c. Scabies
d. Sporothrix
e. Virus
Nothing is seen in microscopic examination of a scraping from the patient’s rash.
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21. Principles of Disease
Characteristics of Infectious Disease
2:11 minutesProblem 3
Textbook Question
On the following figure, show the sites of the following infections: impetigo, folliculitis, acne, warts, shingles, sporotrichosis, pediculosis.
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Verified step by step guidance1
Step 1: Understand the nature and typical location of each infection or condition on the human body. For example, impetigo is a superficial bacterial skin infection usually found on the face and limbs.
Step 2: Identify folliculitis as an infection of the hair follicles, which can occur anywhere hair grows but is commonly seen on the scalp, beard area, or limbs.
Step 3: Recognize acne as a condition affecting the sebaceous glands, primarily on the face, chest, and back.
Step 4: Know that warts are caused by human papillomavirus (HPV) and typically appear on hands, fingers, and sometimes feet.
Step 5: Locate shingles (herpes zoster) along specific dermatomes, often appearing as a painful rash on one side of the torso or face; sporotrichosis is a fungal infection usually affecting the skin on the arms or hands after trauma; pediculosis refers to lice infestation, commonly found on the scalp (head lice), body, or pubic area.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Skin Structure and Layers
Understanding the anatomy of the skin, including the epidermis, dermis, and hair follicles, is essential to locate where infections like impetigo, folliculitis, and acne occur. Different infections target specific layers or structures, influencing their clinical presentation and treatment.
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Types of Skin Infections and Their Etiology
Each infection listed—impetigo, folliculitis, acne, warts, shingles, sporotrichosis, and pediculosis—has a distinct cause, such as bacteria, viruses, fungi, or parasites. Recognizing the pathogen type helps in identifying the infection site and understanding its pathogenesis.
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Pathophysiology and Clinical Manifestations of Skin Infections
Knowing how each infection develops and presents clinically aids in mapping them onto the skin diagram. For example, shingles follows nerve dermatomes, warts affect epidermal layers, and pediculosis involves hair shafts, which guides accurate localization on the figure.
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