Characteristic feature of a zoonotic infection is?

AIIMS Bhuvneshwar NO- 2018

Applied Microbiology & Infection control

Easy

Appeared in: AIIMS Bhuvneshwar NO- 2018

Explanation

A zoonotic infection is a disease transmitted from animals to humans.
Malignant pustule is the characteristic skin lesion of cutaneous anthrax.
Anthrax is a classic zoonotic disease caused by Bacillus anthracis, commonly transmitted from herbivores like sheep and cattle.
The lesion evolves from a papule to a vesicle and then to a painless ulcer with a central black eschar, which is highly characteristic.

Option A: A carbuncle is a cluster of boils caused by Staphylococcus aureus, a common bacterium. It is a pyogenic (pus-forming) infection, not a feature of a specific zoonosis.
Option B: Vincent's angina (acute necrotizing ulcerative gingivitis) is a painful gum infection caused by an overgrowth of bacteria normally found in the mouth. It is not transmitted from animals.
Option D: Swimming pool granuloma is caused by Mycobacterium marinum found in contaminated water (pools, aquariums). It is considered an environmental infection, not a classic animal-to-human zoonosis.

Visual 1: Image: Progression of a malignant pustule in cutaneous anthrax, showing the stages from an initial papule to the formation of the characteristic black eschar.
Visual 2: Infographic: Chart listing common zoonotic diseases, their animal reservoirs, and modes of transmission (e.g., Rabies from dogs, Anthrax from livestock, Plague from rodents).

Clinical Relevance

Nursing practice connection: Knowing Identification of a characteristic sign of a zoonotic infection helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Nurses must obtain a thorough patient history, including occupation and hobbies (e.g., farming, veterinary work, handling animal products), which can be crucial clues for diagnosing zoonotic diseases.
Suspected cases of anthrax are a public health emergency. The nurse has a critical role in implementing infection control measures (Standard Precautions), administering antibiotics as prescribed (e.g., ciprofloxacin or doxycycline), and ensuring prompt notification to public health authorities.
What if the lesion was painful and filled with pus? If the lesion were painful, suppurative (pus-filled), and located in a hair-bearing area, a carbuncle caused by Staphylococcus aureus would be a more likely diagnosis, and the approach would shift from zoonotic disease management to standard treatment for a severe bacterial skin infection.

How to Approach the Question

First, define the key term in the question stem: 'zoonotic infection'. This means a disease transmitted from animals to humans.
Next, evaluate each option to determine its cause and source.
Option A, Carbuncle: Recall or identify this as a common staphylococcal skin infection.
Option B, Vincent's angina: Recognize this as an oral infection related to oral flora.
Option C, Malignant pustule: Link this term to its classic association with cutaneous anthrax.
Option D, Swimming pool granuloma: Connect this to an environmental water source.

Concept Tested & Keywords

Concept Tested: Identification of a characteristic sign of a zoonotic infection.
Stem keywords: zoonotic infection, characteristic feature
Lead-in keywords: is

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