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Updated: May 8, 2026

Modeling Ascending Vaginal Infection, Preterm Birth, and Neonatal Morbidity in Mice
Published on: October 10, 2025
Ureaplasma species: role in neonatal morbidities and outcomes
1Department of Pediatrics, University of Maryland School of Medicine, , Baltimore, Maryland, USA.
Abstract:
The genital mycoplasma species, Ureaplasma parvum and Ureaplasma urealyticum are the most common organisms isolated from infected amniotic fluid and placentas, and they contribute to adverse pregnancy outcomes including preterm birth and neonatal morbidities. In our institution, almost half of the preterm infants of less than 32 weeks gestation are Ureaplasma-positive in one or more compartment (respiratory, blood and/or cerebrospinal fluid), indicating that these organisms are the most common pathogens affecting this population. This review will focus on the compelling epidemiological and experimental evidence linking perinatal Ureaplasma species exposure to important morbidities of prematurity, such as bronchopulmonary dysplasia, intraventricular haemorrhage and necrotising enterocolitis.
Insights
Genital mycoplasma species, Ureaplasma parvum and Ureaplasma urealyticum, are linked to preterm birth and infant morbidities. These common pathogens affect nearly half of very preterm infants, contributing to serious health issues.
Area of Science:
- Obstetrics and Gynecology
- Neonatology
- Infectious Diseases
Background:
- Genital mycoplasma species, Ureaplasma parvum and Ureaplasma urealyticum, are frequently found in amniotic fluid and placentas.
- These bacteria are associated with adverse pregnancy outcomes, including preterm birth and neonatal complications.
Purpose of the Study:
- To review epidemiological and experimental evidence linking perinatal Ureaplasma exposure to morbidities of prematurity.
- To highlight the prevalence of Ureaplasma in preterm infants and its role as a common pathogen.
Main Methods:
- Review of epidemiological studies.
- Analysis of experimental evidence.
- Examination of clinical data from preterm infants.
Main Results:
- Ureaplasma species are the most common organisms in infected amniotic fluid and placentas.
- Nearly 50% of preterm infants (<32 weeks gestation) in the institution are Ureaplasma-positive in various body compartments.
- Evidence links perinatal Ureaplasma exposure to bronchopulmonary dysplasia, intraventricular hemorrhage, and necrotizing enterocolitis.
Conclusions:
- Ureaplasma species are significant contributors to adverse pregnancy outcomes and neonatal morbidities.
- These pathogens represent a major threat to the health of preterm infants.
- Further research is warranted to understand and mitigate the impact of Ureaplasma in perinatal infections.
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