The COVID-19 pandemic is having a significant impact on Americans' mental health, according to a new survey out Thursday from the U.S. Centers for Disease Control and Prevention. It found elevated levels of symptoms of anxiety and depressive disorders, substance use and suicidal ideation among U.S. adults, and identified populations at increased risk, including young people, racial and ethnic minorities, essential workers and caregivers of adults. More than 40% of respondents who completed surveys during June reported an adverse mental or behavioral health condition, and 11% reported having seriously considered suicide in the 30 days prior. The data's greatest value, experts say, is the spotlight it shines on vulnerable populations. "It is showing that this breakdown in our society, the breakdown of the safety net, the breakdown of economic security is taking a massive toll," said Anna Mueller, a suicide researcher and professor of sociology at the Indiana University Bloomington. "These breakdowns really show how crucial economic stability and economic security are to an individual's well being. Because the people who are more vulnerable in terms of their socioeconomic status, people who are being put in harm's way, those are the people who are suffering the most." The survey found 75% of respondents 18-24 reported at least one adverse mental or behavioral health symptom and serious suicidal ideation among this group was 25%.