State and local officials who shuttered school buildings to stem the spread of COVID-19 in early 2020 are beginning to plan for the return of students and staff. They will need evidence-based strategies to know how best to create and maintain safe, healthy spaces. To inform their plans, federal health officials have provided guidance on cleaning…

This study examines medical conditions diagnosed prior to the diagnosis of autism spectrum disorder (ASD). Using a matched case control design with 3911 ASD cases and 38,609 controls, we found that 38 out of 79 medical conditions were associated with increased ASD risk. Developmental delay, mental health, and neurology conditions had the strongest…

Maternal immune activity has been linked to children with autism spectrum disorder (ASD). We examined maternal occupational exposure to asthma-causing agents during pregnancy in relation to ASD risk. Our sample included 463 ASD cases and 710 general population controls from the Study to Explore Early Development whose mothers reported at least one…

The "Morbidity and Mortality Weekly Report" ("MMWR") Series is prepared by the Centers for Disease Control and Prevention (CDC). Data in the weekly "MMWR" are provisional, based on weekly reports to CDC by state health departments. This issue of "MMWR" contains the following studies: (1) Youth Risk Behavior…

In the United States, nearly two-thirds of all deaths among young people 10-14 years of age result from only five causes: motor-vehicle crashes (22.1%), other unintentional injuries (16.7%), cancer (12.9%), suicide (6.8%), and homicide (4.7%). Leading causes of illness and death in all age groups in the United States are related to the following:…