Registered Practical Nurse (RPN) Practice Test

Which type of environmental exposure has been conclusively linked to autistic disorder?

1. Toxic substances

2. Viral agents

3. Radiation exposure

4. Heavy metals

The correct answer is: Viral agents

The link between viral agents and autism spectrum disorder has garnered significant attention in research. Some studies suggest that maternal infections during critical periods of fetal development may be associated with an increased risk of autism in offspring. For example, certain viral infections, such as rubella, are known to impact fetal brain development, potentially leading to neurodevelopmental disorders, including autism. This connection emphasizes the importance of maternal health and the need for preventive measures during pregnancy to mitigate the risk of infections that could influence the developing brain. While toxic substances, radiation exposure, and heavy metals are all areas of research concerning potential environmental impacts on neurodevelopment, the evidence supporting a definitive link to autism is not as robust or conclusive as it is for viral agents. Hence, the association with viral infections stands out in the literature as a significant factor necessitating further study and consideration in the context of environmental exposures and autism.