Group 1 - The World Health Organization (WHO) stated that there is currently no conclusive scientific evidence linking the use of acetaminophen by pregnant women to an increased risk of autism in their children [1] - WHO highlighted that nearly 62 million people globally are affected by autism spectrum disorders, which are a group of diverse conditions related to brain development [1] - Extensive research over the past decade has not established a fixed association between the use of acetaminophen during pregnancy and autism in children [1] Group 2 - WHO confirmed that there is substantial reliable evidence indicating that childhood vaccines do not cause autism, supported by large-scale, high-quality studies conducted in many countries [2] - Independent experts advising WHO since 1999 have repeatedly affirmed that all vaccines, including those containing thimerosal or aluminum, do not lead to autism or other developmental disorders [2]

Core Viewpoint - The World Health Organization (WHO) emphasizes that there is currently no conclusive scientific evidence linking the use of acetaminophen (also known as paracetamol) during pregnancy to autism spectrum disorders [1][4]. Group 1: WHO and Regulatory Responses - WHO states that approximately 62 million people globally suffer from autism spectrum disorders, with a prevalence of 1 in 127 individuals, and the exact causes of autism remain undetermined despite increased awareness and diagnosis [1]. - The European Medicines Agency (EMA) also asserts that existing evidence does not support a link between the use of acetaminophen during pregnancy and autism, recommending the lowest effective dose if needed [4]. - The UK Health Minister publicly criticized President Trump's comments regarding acetaminophen, urging patients to trust medical science and their doctors instead [4]. Group 2: Research Findings - A large-scale study led by epidemiologist Viktor Ahlqvist from Karolinska Institute analyzed data from nearly 2.5 million children born in Sweden between 1995 and 2019, finding no significant link between acetaminophen use during pregnancy and autism [6][7]. - The study indicated that 1.42% of children exposed to acetaminophen during pregnancy were diagnosed with autism, compared to 1.33% of those not exposed, highlighting a very small difference [7]. - Another high-quality study from Japan involving over 200,000 children also concluded that there is no association between acetaminophen use during pregnancy and autism [7].