Impetigo
Basics
Description
Description
- Impetigo is a superficial bacterial infection of the skin
- Primary infection:
- Infection of previously normal skin by direct bacterial invasion
- Secondary infection:
- Infection at site of minor skin trauma or previously existing skin lesions
- Most prevalent in children aged 2–5 yr
- More common in summer months and warm and humid climates
- Easily spread among individuals in close contact
- Predisposing factors:
- Minor trauma, esp around nose area
- Burns
- Insect bites
- HIV infection
- Diabetes mellitus
- Existing skin disease
- Varicella infection
- Complications:
- Acute poststreptococcal glomerulonephritis:
- 1–5% in patients with nonbullous impetigo
- Sepsis
- Cellulitis
- Endocarditis
- Toxic shock syndrome
- Staphylococcal-scalded skin syndrome (SSSS)
- Acute poststreptococcal glomerulonephritis:
Etiology
Etiology
- Classic (nonbullous) impetigo:
- The result of bacteria entering through traumatic skin portal from scratch, abrasion, or insect bite
- Most common form
- Caused by Staphylococcus aureus, group A β-hemolytic streptococci, or both
- Often associated with poor hygiene
- Treatment of both streptococci and S. aureus
- Bullous impetigo:
- Caused by S. aureus, phage group II
- Epidermal cleavage is caused by staphylococcal exfoliative toxins A, B, and D, which are serine proteases that bind and cleave desmoglein 1, an intercellular adhesion molecule in desmosomes
Pregnancy Considerations
Zinc supplementation to mother during pregnancy may lead to decreased incidence in infants
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Citation
Schaider, Jeffrey J., et al., editors. "Impetigo." 5-Minute Emergency Consult, 6th ed., Lippincott Williams & Wilkins, 2020. Emergency Central, emergency.unboundmedicine.com/emergency/view/5-Minute_Emergency_Consult/307114/all/Impetigo.
Impetigo. In: Schaider JJJ, Barkin RMR, Hayden SRS, et al, eds. 5-Minute Emergency Consult. Lippincott Williams & Wilkins; 2020. https://emergency.unboundmedicine.com/emergency/view/5-Minute_Emergency_Consult/307114/all/Impetigo. Accessed November 8, 2024.
Impetigo. (2020). In Schaider, J. J., Barkin, R. M., Hayden, S. R., Wolfe, R. E., Barkin, A. Z., Shayne, P., & Rosen, P. (Eds.), 5-Minute Emergency Consult (6th ed.). Lippincott Williams & Wilkins. https://emergency.unboundmedicine.com/emergency/view/5-Minute_Emergency_Consult/307114/all/Impetigo
Impetigo [Internet]. In: Schaider JJJ, Barkin RMR, Hayden SRS, Wolfe RER, Barkin AZA, Shayne PP, Rosen PP, editors. 5-Minute Emergency Consult. Lippincott Williams & Wilkins; 2020. [cited 2024 November 08]. Available from: https://emergency.unboundmedicine.com/emergency/view/5-Minute_Emergency_Consult/307114/all/Impetigo.
* Article titles in AMA citation format should be in sentence-case
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