(HealthDay)—An estimated 14.3 percent of the U.S. population were infected by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection by mid-November 2020, according to a study published online Jan. 5 in JAMA Network Open.

Frederick J. Angulo, D.V.M., Ph.D., from Pfizer Vaccines in Portland, Oregon, and colleagues conducted a cross-sectional study to estimate the number of SARS-CoV-2 infections, symptomatic infections, hospitalizations, and deaths as of Nov. 15, 2020, in the United States. Data were obtained from four regional and one nationwide U.S. Centers for Disease Control and Prevention seroprevalence surveys for April (16,596 participants), May, June, and July (40,817