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Association between mobility patterns and COVID-19 transmission in the USA: a mathematical modelling study
Hamada S Badr1, Hongru Du2, Maximilian Marshall2
1Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, MD, USA.
The Lancet. Infectious Diseases
|July 5, 2020
Summary
Social distancing significantly reduced COVID-19 transmission rates in the USA. Early behavioral changes, even before mandates, showed effectiveness in mitigating spread, highlighting its importance until a vaccine is available.
Area of Science:
- Epidemiology
- Public Health
- Data Science
Background:
- COVID-19 rapidly spread across the USA, necessitating public health interventions.
- A decentralized response with varying local policies complicated assessing social distancing's impact.
- Human mobility patterns and outbreak intensity presented challenges in evaluating mitigation strategies.
Purpose of the Study:
- To evaluate the effect of social distancing on COVID-19 transmission in the USA.
- To correlate mobility data with COVID-19 growth rates in highly affected counties.
- To understand the timing of behavioral changes relative to public health directives.
Main Methods:
- Utilized daily anonymized cell phone mobility data from January to April 2020.
- Generated a social distancing metric based on relative changes in mobility.
- Employed statistical models to analyze the relationship between mobility changes and COVID-19 growth rates in 25 high-case counties.
Main Results:
- Mobility reductions of 35-63% strongly correlated with decreased COVID-19 case growth rates (Pearson's r > 0.7 in 20/25 counties).
- The impact of mobility changes on transmission became apparent after a 9-12 day lag, up to 3 weeks.
- Behavioral changes and social distancing adoption preceded official stay-at-home policies in many areas.
Conclusions:
- Social distancing is a proven effective measure for mitigating COVID-19 spread in the USA.
- Findings support the need for timely policy-making regarding social distancing measures.
- Continued social distancing is crucial for disease control until widespread vaccine availability.
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