Restrictions Are Slowing Coronavirus Infections, New Data Suggest
By
Donald G. McNeil Jr
Harsh measures, including stay-at-home orders and restaurant closures, are contributing to rapid drops in the numbers of fevers — a signal symptom of most coronavirus infections —
recorded in states across the country, according to intriguing new data produced by a medical technology firm.
https://www.nytimes.com/2020/03/30/health/coronavirus-restrictions-fevers.html
At least 248 million Americans in at least 29 states have been told to stay at home. It had seemed nearly impossible for public health officials to know how effective this measure and others have been in slowing the coronavirus.
But the new data offer evidence, in real time, that tight social-distancing restrictions may be working, potentially reducing hospital overcrowding and lowering death rates, experts said.
The company, Kinsa Health, which produces internet-connected thermometers, first
created a national map of fever levels on March 22 and was able to spot the trend within a day. Since then, data from the health departments of New York State and Washington State have buttressed the finding, making it clear that social distancing is saving lives.
The trend has become so obvious that on Sunday, President Trump extended until the end of April his recommendation that Americans stay in lockdown. Mr. Trump had hoped to lift restrictions by Easter and send Americans back to work.
Kinsa’s thermometers upload the user’s temperature readings to a centralized database; the data enable the company to track fevers across the United States.
Kinsa has more than one million thermometers in circulation and has been getting up to 162,000 daily temperature readings since Covid-19 began spreading in the country.
The company normally uses that data to track the spread of influenza. Since 2018, when it had more than 500,000 thermometers distributed, its predictions have routinely been two to three weeks ahead of those of the Centers for Disease Control and Prevention, which gathers flu data on patient symptoms from doctors’ offices and hospitals.
By Friday morning, fevers in every county in the country were on a downward trend, depicted in four shades of blue on the map.
Fevers were dropping especially rapidly in the West, from Utah to California and from Washington down to Arizona; in many Western counties, the numbers of people reporting high fevers fell by almost 20 percent. The numbers were also declining rapidly in Maine.
As of Monday morning, more than three-quarters of the country was deep blue. A separate display of the collective national fever trend, which had spiked upward to a peak on March 17, had fallen so far that it was actually below the band showing historical flu fever trends — which meant that the lockdown has cut not only Covid-19 transmission but flu transmission, too.
“I’m very impressed by this,” said Dr. William Schaffner, a preventive medicine expert at Vanderbilt University. “It looks like a way to prove that social distancing works.”