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Transmission Dynamics by Age Group in COVID-19 Hotspot Counties - United States, April-September 2020

CDC works with other federal agencies to identify counties with increasing coronavirus disease 2019 (COVID-19) incidence (hotspots) and offers support to state, tribal, local, and territorial health departments to limit the spread of SARS-CoV-2, the virus that causes COVID-19 (1). Understanding whet...

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Bibliographic Details
Published in:MMWR. Morbidity and mortality weekly report 2020-10, Vol.69 (41), p.1494-1496
Main Authors: Oster, Alexandra M, Caruso, Elise, DeVies, Jourdan, Hartnett, Kathleen P, Boehmer, Tegan K
Format: Article
Language:English
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Summary:CDC works with other federal agencies to identify counties with increasing coronavirus disease 2019 (COVID-19) incidence (hotspots) and offers support to state, tribal, local, and territorial health departments to limit the spread of SARS-CoV-2, the virus that causes COVID-19 (1). Understanding whether increasing incidence in hotspot counties is predominantly occurring in specific age groups is important for identifying opportunities to prevent or reduce transmission. The percentage of positive SARS-CoV-2 reverse transcription-polymerase chain reaction (RT-PCR) test results (percent positivity) is an important indicator of community transmission.* CDC analyzed temporal trends in percent positivity by age group in COVID-19 hotspot counties before and after their identification as hotspots. Among 767 hotspot counties identified during June and July 2020, early increases in the percent positivity among persons aged ≤24 years were followed by several weeks of increasing percent positivity in persons aged ≥25 years. Addressing transmission among young adults is an urgent public health priority.
ISSN:0149-2195
1545-861X
DOI:10.15585/mmwr.mm6941e1