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Updated: Aug 29, 2026

Modeling Ascending Vaginal Infection, Preterm Birth, and Neonatal Morbidity in Mice
Published on: October 10, 2025
[Morganella morganii and early-onset neonatal infection]
T Boussemart1, S Piet-Duroux, M Manouana
1Service de pédiatrie B, CHRU de Pointe-à-Pitre, 97159 Pointe-à-Pitre, Guadeloupe. thierry.boussemart@wanadoo.fr
Unlabelled:
Morganella morganii is an opportunistic gram-negative bacterium, resistant to ampicillin, and scarcely involved in early-onset neonatal sepsis.
Case Report:
After a premature rupture of the membranes, a pregnant patient received prophylactic amoxicillin per os. She developed chorioamnionitis. Her infant was diagnosed with early-onset sepsis. Maternal and baby's blood cultures grew M. morganii. Both the mother and the infant were successfully treated with a third-generation cephalosporin and an aminoglycoside.
Discussion:
The influence of a prior antibiotherapy on the emergence of M. morganii vertical infections is discussed.
Insights
This case report highlights a rare instance of Morganella morganii causing early-onset neonatal sepsis following maternal amoxicillin treatment. The study discusses the potential link between prior antibiotic use and the emergence of this opportunistic infection.
Area of Science:
- Neonatal infections
- Bacterial pathogenesis
- Antimicrobial resistance
Background:
- Morganella morganii is an opportunistic gram-negative bacterium.
- It is known for resistance to ampicillin.
- It is rarely implicated in early-onset neonatal sepsis.
Observation:
- A pregnant patient received prophylactic amoxicillin after premature rupture of membranes.
- She developed chorioamnionitis, and her infant was diagnosed with early-onset sepsis.
- Maternal and infant blood cultures identified Morganella morganii.
Findings:
- Both mother and infant were successfully treated with a third-generation cephalosporin and an aminoglycoside.
- This case suggests a potential vertical transmission of M. morganii.
Implications:
- The study discusses the influence of prior antibiotic therapy on the emergence of M. morganii vertical infections.
- This finding may inform clinical practice regarding antibiotic use in pregnancy.
- Further research is warranted to understand the role of M. morganii in neonatal sepsis.
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