Infections during pregnancy can significantly increase the risk of cerebral palsy (CP) in the child by causing inflammation and injury to the developing fetal brain. Several specific infections have been identified as contributors to this risk, primarily through mechanisms involving placental inflammation, fetal brain injury, and preterm birth.
**Congenital Cytomegalovirus (CMV) Infection** is one of the most well-documented infectious causes of cerebral palsy. CMV is a common virus that, when transmitted from mother to fetus during pregnancy, can lead to serious neurological outcomes including sensorineural hearing loss and cerebral palsy. The risk is particularly high if the mother acquires a primary CMV infection during pregnancy, especially in the second and third trimesters. This infection can cause fetal complications such as ventriculomegaly (enlarged brain ventricles), fetal growth restriction, and fetal hydrops, all of which contribute to brain injury and subsequent CP. Screening for CMV during pregnancy and early neonatal diagnosis are critical for managing and monitoring affected infants [1].
**Ureaplasma Infection** is another infection linked to cerebral palsy, particularly through its association with preterm birth and inflammation of the fetal membranes. Ureaplasma parvum can reside silently in the womb but may trigger inflammatory responses that damage the developing white matter of the fetal brain. This damage can lead to neurodevelopmental disorders including CP. Research indicates that different strains (serovars) of Ureaplasma have varying impacts on brain development, which may explain why some exposed fetuses develop CP while others do not. The infection’s role in causing preterm birth further compounds the risk, as prematurity itself is a strong risk factor for cerebral palsy [2].
**Chorioamnionitis**, an infection and inflammation of the fetal membranes (amnion and chorion), is a significant contributor to perinatal brain injury. The placenta, which acts as a communication hub between mother and fetus, responds to infection with an inflammatory cascade that can impair myelin formation and cause neuroinflammation. This inflammatory environment disrupts neural network development and connectivity, leading to brain injury that manifests as cerebral palsy and other neurodevelopmental disorders. The immune signaling along the maternal-placental-fetal axis is central to this process, and placental inflammation is a key pathological mechanism linking infection to CP [3].
Other infections such as **bacterial infections leading to preterm labor** also increase the risk of cerebral palsy indirectly by causing early birth. Preterm infants are more vulnerable to brain injury due to their immature neurological systems and the inflammatory milieu associated with infection and prematurity. Inflammation before birth, regardless of the specific infectious agent, is strongly associated with long-term brain harm including CP, cognitive delays, and sensory impairments [5][6].
It is important to note that while hypertensive disorders of pregnancy have been studied for associations with neurodevelopmental outcomes, current meta-analyses do not show a significant increase in cerebral palsy risk from these conditions alone, highlighting the specific importance of infection and inflammation as causal factors [4].
In summary, infections such as congenital CMV, Ureaplasma species, and chorioamnionitis cause cerebral palsy primarily through inflammatory damage to the fetal brain and by increasing the risk of preterm birth. The placenta plays a crucial role in mediating these effects through immune signaling pathways. Early detection and management of these infections during pregnancy are essential to reduce the risk of cerebral palsy and improve neonatal outcomes.
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**Sources:**
[1] Leruez-Ville M, et al. “Congenital cytomegalovirus infection and cerebral palsy.” BMC Pregnancy Childbirth. 2025 Sep 1;25:909. DOI: 10.1186/s12884-025-08083-0. PMC: PMC12400
