Which bacterial infection is most commonly associated with impetigo in children?

NCL (Northern Coalfields Limited)-NO

Child Health Nursing (Pediatrics)

Easy

Appeared in: NCL (Northern Coalfields Limited)-NO

Explanation

Staphylococcus aureus is now recognized as the leading cause of impetigo in children worldwide.
It is the exclusive cause of bullous impetigo, a form characterized by large blisters.
For non-bullous impetigo, the most common type, S. aureus has surpassed Streptococcus pyogenes as the primary pathogen, although co-infections can occur.
This shift in epidemiology makes S. aureus the most frequent isolate from impetigo lesions overall.

Option A: Escherichia coli is a gram-negative bacterium that is a common cause of urinary tract infections and gastroenteritis. It does not typically cause primary skin infections like impetigo.
Option B: Streptococcus pyogenes (Group A Streptococcus) is a well-known cause of non-bullous impetigo. However, epidemiological studies show that Staphylococcus aureus has become the more predominant cause.
Option C: Pseudomonas aeruginosa is an opportunistic pathogen that typically infects immunocompromised individuals or causes specific types of infections like hot tub folliculitis or infections in burn wounds. It is not a common cause of impetigo in healthy children.

Visual 1: Image - Non-bullous impetigo. A close-up photograph of a child's face showing the classic golden or 'honey-colored' crusts around the nose and mouth. This helps learners recognize the hallmark sign of the most common form of impetigo.
Visual 2: Image - Bullous impetigo. A photograph showing large, flaccid blisters (bullae) on the skin of an infant, some intact and some ruptured, leaving a shiny base. This illustrates the form of impetigo caused exclusively by S. aureus.

Clinical Relevance

Nursing practice connection: Knowing Etiology of Impetigo helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Impetigo is highly contagious. Nurses play a key role in educating families about hygiene measures, such as handwashing, keeping fingernails short, and not sharing towels or bedding, to prevent its spread.
Treatment typically involves topical antibiotics (like mupirocin) for localized infections or oral antibiotics for more extensive disease. The choice of antibiotic must cover S. aureus.
A key nursing responsibility is to monitor for complications. Although rare, impetigo caused by Streptococcus pyogenes can lead to post-streptococcal glomerulonephritis, a serious kidney disease.

How to Approach the Question

First, identify the key terms in the question: 'impetigo,' 'children,' and 'most commonly.' This directs you to find the primary, not just any, cause of this specific skin infection.
Recall the common bacterial pathogens that cause skin infections. This should bring Staphylococcus aureus and Streptococcus pyogenes to mind.
Eliminate the unlikely options. E. coli is primarily associated with the GI and urinary tracts, and P. aeruginosa with opportunistic or specific environmental exposures (like hot tubs), making them improbable causes of routine childhood impetigo.
Differentiate between the two most likely pathogens. Remember that while both cause impetigo, there has been a shift in prevalence. S. aureus is now the leading cause of the most common form (non-bullous) and the only cause of the other form (bullous).
Therefore, conclude that Staphylococcus aureus is the most common overall cause.

Concept Tested & Keywords

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