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Results demonstrate the dramatic impact that earlier interventions could have had on the COVID-19 pandemic in the US. Unsplash

More than one million COVID-19 cases and over 59,000 deaths in the US could have been prevented by early May had social distancing, business closures, and other non-pharmaceutical interventions been implemented two weeks sooner, according to a modeling study published in the journal Science Advances.

The results highlight the importance of quick and aggressive non-pharmaceutical interventions implementation to counter transmission of the SARS-CoV-2 virus and could help inform efforts to control new surges in the US and elsewhere in the world.


“Our results demonstrate the dramatic impact that earlier interventions could have had on the COVID-19 pandemic in the US,” the authors wrote.

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Seeking to understand the impact of timing when implementing non-pharmaceutical interventions, Sen Pei from Columbia University in New York and colleagues first built a metapopulation model of COVID-19 transmission in all 3,142 US counties during the period spanning February 21 through May 3.

They built the model using county-level data of confirmed cases and deaths compiled by USAFacts.org and commuter mobility data from the U.S. Census, adjusting the latter for reductions in mobility due to non-pharmaceutical interventions implemented beginning around March 15.

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The model revealed notable yet asynchronous reductions in disease transmission rates, reflected in changes to the estimated effective basic reproduction number (Re) in most counties during this time period.


Over 9.7 million people in the US have tested positive for COVID-19 so far, while more than 236,000 have died, according to data from Johns Hopkins University. Pixabay

They then performed counterfactual simulations with the same model, moving the timing of non-pharmaceutical interventions implementation either one week or two weeks sooner.

In the first model, advancing non-pharmaceutical interventions by a week, to March 8, resulted in 601,667 fewer confirmed cases and 32,335 fewer deaths nationwide as of May 3.

Want to read more in Hindi? Checkout: भारत में क्रॉस ब्रीडिंग से विकसित हुए थे अजीब आकार के जानवर

In the second model, implementing NPIs a full two weeks earlier, on March 1, resulted in over one million fewer confirmed cases and 59,351 fewer deaths.

The researchers acknowledged that their modeling simplifies some assumptions related to general uncertainty, economic concerns, administrative decision-making, and public adherence to social distancing rules.

However, they also pointed to continuing successes in countries such as South Korea, New Zealand, Vietnam, and Iceland that did implement non-pharmaceutical interventions in early March.

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Over 9.7 million people in the US have tested positive for COVID-19 so far, while more than 236,000 have died, according to data from Johns Hopkins University. (IANS)


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