Omphalitis

Updated: Apr 23, 2025
  • Author: Patrick G Gallagher, MD; Chief Editor: Santina A Zanelli, MD  more...
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Overview

Background

Omphalitis is an infection of the umbilical stump. [1]  It typically presents as a superficial cellulitis around the umbilicus that can spread to involve the entire abdominal wall and may progress to necrotizing fasciitis, myonecrosis, or systemic disease.

Omphalitis is uncommon in industrialized countries outside the setting of umbilical vessel catheterization; however, it remains a common cause of neonatal mortality in less developed regions. It is predominantly a disease of the neonate, with only a few cases having been reported in adults. Risk factors for omphalitis include septic delivery, unplanned home delivery, maternal chorioamnionitis, prolonged rupture of membranes, low birth weight, and umbilical vessel catheterization.

Aerobic bacteria are present in approximately 85% of infections, predominated by Staphylococcus aureus, group A Streptococcus, Escherichia coli, Klebsiella pneumoniae, and Proteus mirabilis. [2, 3, 4, 5]  Methicillin-resistant S aureus has also been described in association with omphalitis and in some hospitals may be the predominant etiologic organism. [6]

In the past, studies emphasized the importance of gram-positive organisms (eg, S aureus and group A Streptococcus) in the etiology of omphalitis. This was followed by a series of reports that highlighted the role of gram-negative organisms in the etiology of omphalitis. These studies suggested that the change in etiology may have been caused by the introduction of prophylactic umbilical cord care using antistaphylococcal agents, such as hexachlorophene and triple dye (a widely adopted practice in the 1960s), with a subsequent increase in gram-negative colonization of the umbilical stump.

 
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