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Home»Pregnancy»New study explores possible link between flu during pregnancy and autism in children
Pregnancy

New study explores possible link between flu during pregnancy and autism in children

healthtostBy healthtostDecember 7, 2024No Comments4 Mins Read
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Autism spectrum disorder (ASD) is a complex developmental condition characterized by challenges with social interaction, communication, and repetitive behaviors. Although not usually classified as a ‘disease’, it occurs as a spectrum of characteristics that vary widely between individuals. Recent research has shed light on potential links between a mother’s health during pregnancy and an increased likelihood of autism in children, sparking debate about the role of environmental factors such as infections in fetal development.

In the United States, autism diagnoses have risen sharply over the decades. According to 2022 data, 30.3 per 1,000 children aged 5 to 8 and 28.8 per 1,000 children aged 4 and under are identified with ASD. The condition is more common in boys than girls, with around 4 in 100 boys and 1 in 100 girls affected. These statistics highlight the importance of understanding the factors that contribute to the increase in ASD diagnoses.

One area of ​​focus for the researchers was the impact of infections during pregnancy, such as the flu, and how they may contribute to an increased risk of autism. While the link isn’t definitive — catching the flu during pregnancy doesn’t guarantee a child will develop ASD — emerging evidence suggests that maternal infections and the subsequent immune response can affect neurodevelopment in the fetus.

Immune activation and its role in neurodevelopment

Dr. Irene Sanchez Martin, a postdoctoral researcher at Cold Spring Harbor Laboratory, presented recent findings from a study examining how maternal immune system activation (MIA) during pregnancy can affect fetal brain development. Using mouse models, her research simulated viral infections during early pregnancy, which corresponds to the first trimester in humans. The study revealed that inflammation caused by maternal immune responses could lead to developmental deficits in fetuses within as little as 24 hours of exposure.

Interestingly, the deficits were seen mostly in male fetuses, in line with the higher prevalence of autism in boys. The study emphasized that it is not the virus itself, but the inflammation caused by the mother’s immune response that could disrupt the fetal environment. This disorder can affect critical components such as the amniotic fluid or the placenta, leading to developmental abnormalities.

“Basically, this leads us to understand that it is inflammation that is the factor associated with these problems,” explained Dr. Sánchez Martin.

The role of inflammation in autism risk

The findings are consistent with other research that emphasizes the role of inflammation rather than the specific infectious agent. Increased levels of cytokines—proteins associated with inflammation—have been observed in mothers whose children were later diagnosed with autism. Dr. Ian Lipkin, director of Columbia University’s Center for Infection and Immunity, noted that many environmental factors could trigger inflammation, underscoring the complexity of understanding its role in fetal development.

“Our work shows that women who have febrile episodes, high antibody titers, or laboratory-confirmed influenza are at higher risk of having children who will subsequently receive an ASD diagnosis,” Lipkin said.

His research, which focused on laboratory-confirmed influenza cases and self-reported severe symptoms, further supports the idea that maternal health during pregnancy can influence neurodevelopmental outcomes in children.

Balancing Awareness and Action

While the research provides valuable insights, it is important to view these findings with caution. Animal studies, such as those done in mice, may not fully translate to human results, and many other genetic and environmental factors contribute to autism. Additionally, pregnant individuals should not feel alarmed or overly burdened by these findings, but instead focus on measures that promote overall health during pregnancy.

Health professionals recommend maintaining a healthy lifestyle, managing stress, and consulting with health care providers about any concerns are also key steps in supporting a healthy pregnancy.

The link between maternal infections and autism risk underscores the importance of continued research into the interplay of genetics, environment, and fetal development. Studies such as those conducted by Dr. Sanchez Martin and Dr. Lipkin offer critical insights while emphasizing the need for further exploration to uncover the nuances of these relationships.

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