Changing age distribution of the COVID-19 pandemic \u2014 United States, May\u2013August 2020

What is already known about this topic? Early in the pandemic, COVID-19 incidence was highest among older adults.What is added by this report? During June\u2013August 2020, COVID-19 incidence was highest in persons aged 20\u201329 years, who accounted for >20% of all confirmed cases. Younger adults likely contribute to community transmission of COVID-19. Across the southern United States in June 2020, increases in percentage of positive SARS-CoV-2 test results among adults aged 20\u201339 years preceded increases among those aged 6560 years by 4\u201315 days.What are the implications for public health practice? Strict adherence to community mitigation strategies and personal preventive behaviors by younger adults is needed to help reduce infection and subsequent transmission to persons at higher risk for severe illness.As of September 21, 2020, the coronavirus disease 2019 (COVID-19) pandemic had resulted in more than 6,800,000 reported U.S. cases and more than 199,000 associated deaths.* Early in the pandemic, COVID-19 incidence was highest among older adults (1). CDC examined the changing age distribution of the COVID-19 pandemic in the United States during May\u2013August by assessing three indicators: COVID-19\u2013like illness-related emergency department (ED) visits, positive reverse transcription\u2013polymerase chain reaction (RT-PCR) test results for SARS-CoV-2, the virus that causes COVID-19, and confirmed COVID-19 cases. Nationwide, the median age of COVID-19 cases declined from 46 years in May to 37 years in July and 38 in August. Similar patterns were seen for COVID-19\u2013like illness-related ED visits and positive SARS-CoV-2 RT-PCR test results in all U.S. Census regions. During June\u2013August, COVID-19 incidence was highest in persons aged 20\u201329 years, who accounted for >20% of all confirmed cases. The southern United States experienced regional outbreaks of COVID-19 in June. In these regions, increases in the percentage of positive SARS-CoV-2 test results among adults aged 20\u201339 years preceded increases among adults aged 6560 years by an average of 8.7 days (range = 4\u201315 days), suggesting that younger adults likely contributed to community transmission of COVID-19. Given the role of asymptomatic and presymptomatic transmission (2), strict adherence to community mitigation strategies and personal preventive behaviors by younger adults is needed to help reduce their risk for infection and subsequent transmission of SARS-CoV-2 to persons at higher risk for severe illness.Suggested citation for this article: Boehmer TK, DeVies J, Caruso E, et al. Changing Age Distribution of the COVID-19 Pandemic \u2014 United States, May\u2013August 2020. MMWR Morb Mortal Wkly Rep. ePub: 23 September 2020.mm6939e1.htm?s_cid=mm6939e1_wmm6939e1-H.pdf2020838