Omphalitis Causes and Risk Factors

Primary Bacterial Pathogens

Omphalitis results from bacterial colonization of the devitalized umbilical cord, with Staphylococcus aureus being the most frequently reported pathogen, followed by Group A and B Streptococci and Gram-negative bacilli including E. coli, Klebsiella, and Pseudomonas species, in neonates 1
Anaerobic and polymicrobial infections occur rarely but should be considered in severe cases of omphalitis 1

The maternal birth canal serves as the primary source of bacterial exposure during delivery, and nonsterile hands of any person assisting with delivery represent the most prominent local bacterial source 1, 2
Environmental contamination at the delivery site, particularly in home births, is a significant source of bacterial exposure 1

Unplanned home birth or septic delivery increases the risk of omphalitis 6-fold compared to hospital births in resource-limited settings 1
Low birth weight (less than 2500 grams) significantly increases susceptibility to omphalitis 1
Prolonged rupture of membranes allows ascending bacterial colonization, and umbilical catheterization creates a direct portal for bacterial entry 1
Chorioamnionitis indicates pre-existing maternal-fetal infection, increasing the risk of omphalitis 1

Navel piercing is the most common cause of omphalitis in adults, with bacterial contamination during or after the piercing procedure 3
Frictional irritation from jewelry and migration/rejection of jewelry create portals for infection in adults with omphalitis 3
The same bacterial pathogens (S. aureus, Streptococci, Gram-negative bacilli) cause adult umbilical infections, as in neonates 3

Even painless whitish discharge from the umbilicus may represent early infection with potential for serious complications due to direct vascular access to the bloodstream, with case-fatality rates as high as 13% in untreated cases 2, 4