1; Yan Wang, PhD2; Hua Lu, MS2; Katherine E. Marshall, MPH1; Nicole F. Dowling, PhD1; Gabriela Paz-Bailey, MD, PhD1; Evelyn R.
Twentyman, MD1; Georgina Peacock, MD1; Kurt J. Greenlund, PhD2 (View author affiliations)Older adults and those with chronic obstructive pulmonary disease, heart disease, diabetes, chronic kidney disease, and obesity are at higher risk for severe COVID-19–associated illness.The median model-based estimate of the prevalence of any of five underlying medical conditions associated with increased risk for severe COVID-19–associated illness among U.S.
adults was 47.2% among 3,142 U.S. counties. The estimated number of persons with these conditions followed population distributions, but prevalence was higher in more rural.