Stay-at-home orders significantly associated with reduced spread of COVID-19, study finds

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Stay-at-home orders significantly associated with reduced spread of COVID-19, study finds
This map highlights the share improve in epidemic doubling time between pre-stay-at-home order and through stay-at-home order time intervals, by state. Credit: Brown University

Across the globe, COVID-19 has contaminated greater than 18 million folks to this point and has killed lots of of 1000’s—and the United States has been hit particularly arduous. Although the U.S. contains simply 4.2% of the worldwide inhabitants, it accounted for about 33% of all reported infections by the top of April.

However, the bulk of U.S. states ultimately imposed stay-at-home orders, and people orders seem to have significantly slowed the spread of the illness for the nation as a complete.

These findings—alongside with a state-by-state breakdown of how rapidly COVID-19 spread earlier than and after lockdown orders—have been printed within the Journal of Infectious Diseases on Saturday, Aug. 1.

“Understanding the trajectory of the epidemic in the U.S. is critical, and measuring the impact of stay-at-home orders on epidemic growth offers evidence for current and future COVID-19 control and containment measures,” stated Mark Lurie, an affiliate professor of epidemiology at Brown University. “While this was not a , and therefore we cannot establish causation, what was clear in our study is that stay-at-home orders were significantly associated with slowing epidemic growth rates.”

Lurie was the lead co-author for the study as half of a group of researchers from Brown’s School of Public Health and Warren Alpert School of Medicine.

The study calculated the pandemic doubling time—the quantity of time it takes for the quantity of instances to double—on each a nationwide degree and for particular person states. An improve in doubling time signifies a slowing pandemic.

This map highlights the share improve in epidemic doubling time between pre-stay-at-home order and through stay-at-home order time intervals, by state.

Before the results of widespread lockdowns grew to become obvious—from March Four till April 4—the nationwide pandemic doubling time was 2.68 days. This doubling time elevated significantly, to a median of 15 days, within the interval between April 5 and April 30. In different phrases, the quantity of instances doubled in lower than three days earlier than mitigation measures have been put into place. In distinction, after mitigation measures, the quantity of instances took greater than two weeks to double.

But whereas doubling time elevated in all states, the speed of improve different. On common, the 45 states with stay-at-home orders in place added about 12.27 days to their doubling time, indicating vital slowing of illness spread. Meanwhile, the 5 states with out stay-at-home orders—Arkansas, Iowa, Nebraska, North Dakota and South Dakota—added solely about six days to their doubling time, and 4 of these states exhibited some of the worst doubling charges within the nation.

“We hope that these findings contribute to a growing body of evidence aimed at studying the full course of COVID-19 in America,” stated Joe Silva, a Ph.D. scholar at Brown’s School of Public Health and one other lead co-author on the study. “This study does not imply stay-at-home orders were the sole factor that drove the observed increase in epidemic doubling time, but the data may be representative of the impact of multiple measures.”

As the researchers printed their findings, they did so conscious that the U.S. is much from having efficiently addressed the COVID-19 pandemic, he added.

“Our study period included data through the end of April, and since then cases have increased beyond what was previously thought to be the peak of the pandemic within our borders,” Silva stated. “During this time, states have also removed stay-at-home orders, and it will be just as important to study the potential impacts on disease spread after these measures were no longer in place.”


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More data:
Mark N Lurie et al, COVID-19 epidemic doubling time within the United States earlier than and through stay-at-home restrictions, The Journal of Infectious Diseases (2020). DOI: 10.1093/infdis/jiaa491

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Brown University

Citation:
Stay-at-home orders significantly associated with reduced spread of COVID-19, study finds (2020, August 12)
retrieved 12 August 2020
from https://medicalxpress.com/information/2020-08-stay-at-home-significantly-covid-.html

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