Questions and Answers
What is a common manifestation of contagious pustular dermatitis in sheep and goats?
Which viral disease is associated specifically with epithelial tissue involvement?
What type of infectious agent can enter the body via hair follicles?
Which of the following is NOT a characteristic of viral skin diseases?
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What type of skin lesions are primarily seen during the viremia phase of systemic viral infections?
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What is one of the primary diagnostic methods for identifying viral skin diseases?
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What is the condition characterized by an absence of hair?
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What type of virus is associated with the condition known as scrapi?
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Which animal is primarily affected by contagious ecthyma?
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Which condition results from the incomplete development of the stratified squamous epithelium?
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In which areas do gross lesions typically occur in photosensitization?
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What are the common effects of hypotrichosis on animals?
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What type of injury is specifically categorized under chemical injury?
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What physical injury can be caused by repeated licking or chewing due to psychological issues?
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During acute solar dermatitis, which symptom is typically observed first?
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What is a characteristic gross lesion seen in solar dermatitis over time?
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Study Notes
Types of Hair Loss
- Alopecia: Complete absence of hair.
- Hypotrichosis: Reduced hair amount, increasing susceptibility to sunburn and infections.
Connective Tissue Disorders
- Collagen Dysplasia: Characterized by hyper-extensibility and laxity of connective tissues.
Epitheliogenesis Imperfecta
- Incomplete development of stratified squamous epithelium affecting skin, adnexa, or oral mucosa.
Environmental Induced Skin Diseases
- Sun Injury: Caused by actinic (sun) damage and direct environmental factors.
- Chemical Injury: Local penetration through skin or systemic absorption leading to tissue damage.
- Physical Injury: Includes abrasions, lacerations, ulcerations, exposure to extremes in temperature, and foreign bodies.
Sunburn and Solar Dermatitis
- Caused by endothelial damage and keratinocyte injury, creating inflammatory responses.
- Acute Symptoms: Redness, pain, possible edema and blistering.
- Chronic Symptoms: Thickened inflamed skin, potential dysplasia or neoplasia; commonly affects ventral abdomen and thorax.
Photosensitization
- Activation of photodynamic substances leading to skin damage under UV-A or visible light.
- Type I: Exogenous agents, often from plants or drugs.
- Type II: Aberrant endogenous factors.
- Type III (Hepatogenous): Impaired removal of chlorophyll metabolites.
- Type IV: Unknown causes.
- Affects areas with poorly pigmented hair and skin.
Psychogenic Dermatitis
- Develops from persistent licking or chewing due to emotional or psychological stress.
- Common triggers include boredom, anxiety from environmental changes, or loss of companions.
Infectious Skin Diseases
- Categories include viral, bacterial, mycotic, parasitic, and protozoal skin diseases, with various entry routes including trauma, hair follicles, and skin glands.
Viral Skin Diseases
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Local Infections: Mainly caused by poxviruses affecting multiple animal species.
- Contagious Pustular Dermatitis: Parapoxvirus affecting sheep and goats, can be fatal in young animals. Characterized by vesicles and crusts typically on lips.
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Systemic Infections: Involves viruses like canine distemper and bovine viral diarrhea (BVD).
- Diagnosis includes clinical history, skin biopsy showing dermatitis, serology, and PCR.
Specific Viral Diseases
- Foot and Mouth Disease (FMD): A severe systemic viral infection impacting livestock.
- Papilloma Virus: Affects canine and bovine species, leading to verrucous lesions on skin.
Pyoderma
- Superficial Pyoderma: Presents as erythematous dermatitis with notable epidermal collarettes.
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Description
Test your knowledge on various types of hair loss, connective tissue disorders, and environmental skin diseases. This quiz covers conditions like alopecia, sunburn, and epitheliogenesis imperfecta. Understand the causes, symptoms, and implications of these dermatological issues.
