Stockholm. The mother's health and immune system during pregnancy play a decisive role in the neurological and physical development of the baby in the womb. A comprehensive and long-term study conducted by researchers at Sweden's prestigious Karolinska Institutet has concluded that the risk of developing Autism Spectrum Disorder (ASD) can increase by almost three-fold in children of mothers exposed to serious and rare infections during pregnancy. This research, based on national health registries of millions of babies and mothers, has drawn medical attention to how severe inflammation and immune activation during pregnancy can affect the delicate neurodevelopmental path of the fetus. The study focused specifically on rare infections that required hospitalization or intensive medical care in pregnant women. What the Swedish study says: Key findings Swedish researchers, analyzing decades of extensive data, found that serious, undiagnosed or rare infectious conditions have a stronger impact than common seasonal colds: Three times the risk: Pregnant women who experienced serious bacterial or viral rare infections during pregnancy were almost three times as likely to have children with a clinical diagnosis of autism compared with the general population. Was done. Cases requiring hospitalization: The study found that the risk was especially highest when the infection was severe enough that the woman had to be given intravenous (IV) antibiotics, antiviral drugs or kept in the hospital for special observation. Timing of infection (Trimester Sensitivity): The effect of infection was seen to be most sensitive during the first and second trimesters, because it is during this time period that the primary formation of neuronal structures, synaptic connections and cortical layers of the fetal brain is taking place. Does the pathogen directly attack the brain? Researchers have clarified that in most cases it is not necessary that a virus or bacteria crosses the placenta and reaches the baby's brain directly. The main role behind this is the mother's own immune system: Maternal Immune Activation (MIA): When the mother's body fights a serious or unusual infection, large amounts of inflammatory chemicals (Pro-inflammatory Cytokines such as IL-6, IL-17a and TNF-alpha) are released into the bloodstream. Placental Barrier and the Fetal Brain: Excessive cytokine storm can sometimes reach the fetal circulatory system through the placenta. It activates microglia (immune cells of the brain) in the fetal brain, which can cause subtle changes in the natural development and communication patterns of neurons. Susceptibility to rare infections: Rare or unusual pathogens trigger a more aggressive and uncontrolled immune response in the body, leading to higher inflammation over a longer period of time. Broader context of the study: No panic, need for vigilance Medical experts and researchers have also cautioned pregnant women that the results of this study should not be seen as fear or panic: Relative risk vs absolute risk: Researchers say that three times the risk is a 'relative risk'. This does not at all mean that the child of every woman suffering from severe infection during pregnancy will be a victim of autism. Autism is a multifactorial condition in which genetics play a major role, 60 to 80 percent of the time. Other than common infections: Common flu, mild urinary tract infection (UTI) or seasonal cold that are treated timely do not usually fall into this category. The focus of the study was on untreated, complicated or rare systemic infections. Prevention and timely treatment: If a pregnant woman experiences high fever, persistent chills, or any unusual infection, she should immediately contact a doctor and get antibiotic or antiviral treatment. Controlling fever and infection leads to a rapid reduction in cytokine levels, thereby reducing the risk to the fetus to a great extent. Regular antenatal care, timely vaccination and immediate medical advice at any sign of infection during pregnancy are the strongest safeguards for the long-term health of both the mother and the baby.
