Alliance for Pandemic Preparedness

November 17, 2020

Continued Age Shift of Confirmed Positive COVID-19 Incidence Over Time to Children and Young Adults Washington State March – August 2020

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[Pre-print, not peer reviewed] A longitudinal cohort analysis in Washington State found a shift in the age distribution of confirmed COVID-19 cases from older age groups to young adults and children. From March to April 2020, there was a 10% decline in cases age 60 years and older and a 20% increase among those age 0-19 and 20-39 years. By August 2020, cases who were younger than age 40 comprised an average of 60% of total cases, with ages 0-19 accounting for 19% of cases and ages 20-39 accounting for 42% of cases.

Malmgren et al. (Nov 16, 2020). Continued Age Shift of Confirmed Positive COVID-19 Incidence Over Time to Children and Young Adults Washington State March – August 2020. Pre-print downloaded Nov 17 from https://doi.org/10.1101/2020.11.12.20229468