ATLANTA, September 21 — Children born with congenital TORCH infections are three times more likely to be diagnosed with autism spectrum disorder and seven times more likely to be diagnosed with an intellectual disability than children without such infections, according to a newly published study. The research also found measurable effects on academic performance, suggesting these infections can shape brain development well beyond infancy. The study’s design, sample size and the specific academic metrics used were not detailed in the initial release, but the findings were described as statistically significant.
TORCH is a long-established medical acronym. It stands for Toxoplasmosis, Other pathogens — a group that includes syphilis, varicella-zoster virus, parvovirus B19 and Zika virus — Rubella, Cytomegalovirus (CMV), and Herpes simplex virus.
All of these pathogens are known to cross the placenta and infect a developing fetus. Congenital CMV is among the most common congenital infections worldwide, affecting an estimated 0.5 to 2 percent of live births in the United States and other high-income countries, according to the Centers for Disease Control and Prevention. The CDC has long identified congenital CMV as a leading cause of childhood hearing loss and neurodevelopmental disability.
Rubella tells a different story. Once a major cause of congenital defects, it has been largely controlled in the United States since the rubella vaccine arrived in 1969, though it remains a significant threat in countries with low vaccination coverage.
Toxoplasmosis, caused by the parasite Toxoplasma gondii, is estimated by the CDC to infect more than 40 million people in the United States, though congenital transmission is relatively rare. Herpes simplex virus can pass to newborns during delivery; neonatal herpes affects an estimated 1 in 3,000 to 1 in 20,000 live births in the United States each year, according to the CDC.
Placing the Numbers in Context
Autism spectrum disorder is currently estimated by the CDC to affect approximately 1 in 36 children in the United States, based on 2020 surveillance data from the Autism and Developmental Disabilities Monitoring Network. Intellectual disability affects roughly 1 to 3 percent of the population, according to the American Association on Intellectual and Developmental Disabilities. The new findings suggest congenital TORCH infections may account for a meaningful share of these cases.
The study’s authors did not provide a specific population-attributable fraction in the information released. The work adds to a growing body of evidence linking early-life infections to later neurodevelopmental disorders.
Prior research has shown that congenital infections such as CMV can cause cognitive deficits, motor impairments and learning difficulties that persist into school age — a pattern the new academic findings align with.
Prevention, Screening and What Comes Next
There is currently no universal screening program for congenital CMV in the United States, though some states, including Utah, have enacted targeted screening laws for newborns who fail hearing tests. The CDC recommends pregnant women practice good hygiene, such as washing hands after contact with saliva or urine from young children, to reduce the risk of CMV infection. No licensed vaccine for CMV exists, though several candidates are in clinical trials.
For rubella, the MMR vaccine is recommended for all children and women of childbearing age and has been highly effective in preventing congenital rubella syndrome. Toxoplasmosis prevention focuses on avoiding undercooked meat and contact with cat feces.
Neonatal herpes can be mitigated through antiviral treatment, particularly when cesarean delivery is performed for women with active genital lesions. What to watch next is whether the findings push congenital CMV screening and vaccine development higher on the public health agenda, and whether long-term developmental surveillance becomes standard for affected children — the consequences may not surface until school age or later. Consult your doctor for medical advice.
