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Timing of community mitigation and changes in reported COVID-19 and community mobility ― four U.S. metropolitan areas, February 26–April 1, 2020
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April 13, 2020
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Description:What is already known on this topic? Implementing community mitigation strategies, including personal protective measures persons should adopt in community settings, social distancing, and environmental cleaning in community settings, during a pandemic can slow the spread of infections.
What is added by this report? During February 26–April 1, 2020, community mobility (a proxy measure for social distancing) in the metropolitan areas of Seattle, San Francisco, New York City, and New Orleans declined, decreasing with each community mitigation policy issued and as case counts increased.
What are the implications for public health practice? Public policies to increase compliance with community mitigation strategies might be effective in decreasing community mobility; however, more information is needed to assess impact on disease Transmission.
Community mitigation activities (also referred to as nonpharmaceutical interventions) are actions that persons and communities can take to slow the spread of infectious Diseases. Mitigation strategies include personal protective measures (e.g., handwashing, cough etiquette, and face coverings) that persons can use at home or while in community settings; social distancing (e.g., maintaining physical distance between persons in community settings and staying at home); and environmental surface cleaning at home and in community settings, such as schools or workplaces. Actions such as social distancing are especially critical when medical countermeasures such as vaccines or therapeutics are not available. Although voluntary adoption of social distancing by the public and community organizations is possible, public policy can enhance implementation. The CDC Community Mitigation Framework (1) recommends a phased approach to implementation at the community level, as evidence of community spread of disease increases or begins to decrease and according to severity. This report presents initial data from the metropolitan areas of San Francisco, California; Seattle, Washington; New Orleans, Louisiana; and New York City, New York* to describe the relationship between timing of public policy measures, community mobility (a proxy measure for social distancing), and temporal Trends in reported coronaVirus disease 2019 (COVID-19) cases. Community mobility in all four locations declined from February 26, 2020 to April 1, 2020, decreasing with each policy issued and as case counts increased. This report suggests that public policy measures are an important tool to support social distancing and provides some very early indications that these measures might help slow the spread of COVID-19.
Suggested citation for this article: Lasry A, Kidder D, Hast M, et al. Timing of Community Mitigation and Changes in Reported COVID-19 and Community Mobility ― Four U.S. Metropolitan Areas, February 26–April 1, 2020. MMWR Morb Mortal Wkly Rep. ePub: 13 April 2020. DOI: http://dx.doi.org/10.15585/mmwr.mm6915e2
mm6915e2-H.pdf
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Content Notes:TABLE. Reported COVID-19 cases and deaths and estimated cumulative incidence,* March 31 and April 7, 2020, and change in cumulative incidence from March 31 to April 7, 2020 — U.S. jurisdictions -- FIGURE 1. Cumulative number of reported COVID-19 cases, by jurisdiction — selected U.S. jurisdictions,*,† April 7, 2020 -- FIGURE 2. Cumulative incidence* of COVID-19, by report date — selected U.S. jurisdictions,†,§ March 10–April 7, 2020 -- FIGURE 3. Number of reported COVID-19–related deaths, by jurisdiction — selected U.S. jurisdictions,*,† April 7, 2020.
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