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Can maternal infections during pregnancy influence autism genetics? 

Posted
Updated
ByMy Patient Advice
Author: Lucia Alvarez, MSc | Reviewed by: Dr. Rebecca Fernandez, MBBS

Yes, maternal infections during pregnancy have been linked to changes in foetal brain development and may influence how genetic risk for autism is expressed. While infections do not cause autism directly, they may act as environmental triggers, interacting with a child’s genetic predisposition and affecting neurodevelopmental outcomes. 

Viral infections, such as influenza, rubella or COVID-19, have been studied for their potential impact when contracted during pregnancy. These infections can trigger a strong immune response in the mother, which in turn may influence how genes involved in brain growth and function are activated in the developing foetus. This connection highlights the importance of maternal health during pregnancy and the complex relationship between the immune system, environment and autism development. 

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How Maternal Infections Affect Autism Risk 

Here are two keyways maternal infections may influence the genetic expression linked to autism: 

Immune activation affects brain development 

When a mother’s immune system responds to infection, inflammatory molecules such as cytokines can cross the placenta and alter the foetal environment. In genetically susceptible children, this may interfere with processes like synapse formation and neuronal connectivity, core areas in autism development. 

Timing and type of infection matter 

Not all infections carry the same risk. Those occurring during the first or second trimester may have a greater impact, especially if the virus affects the nervous system or leads to fever. These effects are most concerning when combined with a family history of autism or other genetic vulnerabilities. 

Understanding the role of maternal infections in autism offers insight into how prenatal care and prevention can support healthier outcomes. Visit providers like Autism Detect for personal consultations and further guidance on screening and support. 

For a deeper dive into the science, diagnosis and full treatment landscape, read our complete guide to Genetic Influences.

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Lucia Alvarez, MSc
Author

Lucia Alvarez is a clinical psychologist with a Master’s in Clinical Psychology and extensive experience providing evidence-based therapy and psychological assessment to children, adolescents, and adults. Skilled in CBT, DBT, and other therapeutic interventions, she has worked in hospital, community, and residential care settings. Her expertise includes grief counseling, anxiety management, and resilience-building, with a strong focus on creating safe, supportive environments to improve mental well-being.

All qualifications and professional experience stated above are authentic and verified by our editorial team. However, pseudonym and image likeness are used to protect the author's privacy. 

Dr. Rebecca Fernandez, MBBS
Reviewer

Dr. Rebecca Fernandez is a UK-trained physician with an MBBS and experience in general surgery, cardiology, internal medicine, gynecology, intensive care, and emergency medicine. She has managed critically ill patients, stabilised acute trauma cases, and provided comprehensive inpatient and outpatient care. In psychiatry, Dr. Fernandez has worked with psychotic, mood, anxiety, and substance use disorders, applying evidence-based approaches such as CBT, ACT, and mindfulness-based therapies. Her skills span patient assessment, treatment planning, and the integration of digital health solutions to support mental well-being.

All qualifications and professional experience stated above are authentic and verified by our editorial team. However, pseudonym and image likeness are used to protect the reviewer's privacy. 

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