{"id":30251,"date":"2020-03-25T12:00:33","date_gmt":"2020-03-25T18:00:33","guid":{"rendered":"https:\/\/www.uchealth.org\/today\/?p=30251"},"modified":"2024-07-18T15:25:52","modified_gmt":"2024-07-18T21:25:52","slug":"physical-distancing-critical-to-change-coronavirus-math","status":"publish","type":"post","link":"https:\/\/www.uchealth.org\/today\/physical-distancing-critical-to-change-coronavirus-math\/","title":{"rendered":"Physical distancing \u2013 based on the harsh realities of math \u2013 is a vital step to fighting the coronavirus pandemic"},"content":{"rendered":"
<\/div>
\"Crowd
The coronavirus math is stunning. \u201cIt took three months to reach 100,000 coronavirus cases worldwide. The second 100,000 only took 12 days.” Photo: Getty Images.<\/figcaption><\/figure>\n

We in Colorado and many around the country are now taking extraordinary measures to try stem the tide of the coronavirus pandemic sweeping across Colorado, the US and the globe.<\/p>\n

Gov. Jared Polis has issued a statewide “stay-at-home” order. Our schools and most offices are closed. We have no sports, no events, no conferences, no skiing and no restaurants (besides take-out here and there).<\/p>\n

To some, these extraordinary measures may seem like overkill, but make no mistake: all our efforts now to slow the spread of the coronavirus will make an enormous difference in how we come out of the coronavirus pandemic on the other side.<\/p>\n

One of UCHealth\u2019s top doctors now is admonishing Coloradoans to immediately do all they can to slow the spread of the virus that causes COVID-19<\/a>.<\/p>\n

\"Dr.
Dr. Richard Zane has put out an urgent call for people to practice physical distancing.<\/figcaption><\/figure>\n

\u201cLives are on the line. Please everyone. Get more serious,\u201d said Dr. Richard Zane<\/a>, UCHealth\u2019s chief innovation officer and chair of the University of Colorado School of Medicine\u2019s Department of Emergency Medicine<\/a> on the Anschutz Medical Campus<\/a>.<\/p>\n

\u201cThere is no longer any debate. All medical experts agree that the spread of coronavirus is now on pace to overwhelm the U.S. health care system by this summer,\u201d Zane said. \u201cThe most powerful, and really only, tool we have left to change this alarming projection is social distancing. Yet far too many people are falling short of what\u2019s needed.\u201d<\/p>\n

You might ask why Zane is speaking out in such a direct way. After all, the number of COVID-19 cases that we know about and deaths thus far remain relatively small, adjusted for population.<\/p>\n

For updated numbers in Colorado, please click here<\/a>; to view the numbers globally, please see the tracker<\/a>\u00a0that Johns Hopkins University is updating in real time.<\/p>\n

In a country of 327 million people, the current number of cases as of midday on Wednesday, March 25, translates into about one per roughly 5,400 people (these numbers are changing hourly). Now, given the challenges with testing, the late start, and other factors contributing to undercount, let\u2019s say the actual number of cases is 10 times higher \u2013 no one knows for sure. That\u2019s still only one case for every 540 people \u2013 about two tenths of one percent. As it happens, Colorado\u2019s ratios track about the same as the national numbers right now. So the question: why all the fuss \u2013 and in particular, why is physical distancing, also known as social distancing, so important \u2013 in the face of perhaps 1-in-500 odds?<\/p>\n

The essential exponential function for COVID-19<\/strong><\/h3>\n

Because the coronavirus pandemic is progressing as an exponential function, and if we as a society don\u2019t catch it early, we risk that we will have too many patients and too few hospital beds<\/a>, ventilators, and health care providers all over the country \u2013 and yes, in Colorado, too \u2013 much sooner than makes intuitive sense.<\/p>\n

There\u2019s a reason for this \u2013 one often cited by the late Al Bartlett, the University of Colorado Boulder physics professor who emphasized during 1,742 talks<\/a> he gave prior to his death in 2013: \u201cThe greatest shortcoming of the human race is our inability to understand the exponential function.\u201d<\/p>\n

Please don\u2019t glaze over with the terms \u201cexponential\u201d and \u201cfunction.\u201d For most of us, they evoke grinding through math homework years or decades ago. But in practice, exponential functions are everywhere, and at some level, we can intuit them. The old phone tree is an exponential function: you call two people, they call two people, they call two people and you\u2019ve just spread the word to 14 people. The \u201cnetwork effect\u201d that has made Facebook CEO Mark Zuckerberg a billionaire many times over is an exponential function.<\/p>\n

There are, though, exponential functions that seem outlandish. Put one grain of rice on the first square of a chess board and double the quantity on each of the next 63 squares (the second square has two rice grains, the third four, the fourth eight, and so on), you have, on that last square, a number grains about 100 million times greater than the number of stars in the Milky Way galaxy. And here\u2019s one from a recent Washington Post<\/em> headline: \u201cIt took three months to reach 100,000 coronavirus cases worldwide. The second 100,000 only took 12 days.\u201d<\/p>\n

The epidemiology of the coronavirus pandemic boils down to exponential math. With exponents, numbers seem to creep up early and then explode when they hit a certain threshold \u2013 an inflection point. With coronavirus, keeping people away from each other to avoid transmission is the very best tool we have right now to avoid reaching that inflection point and the enormous problems doing so will cause.<\/p>\n

Colorado Gov. Jared Polis\u2019 orders to shut down Colorado\u2019s ski areas and nearly all non-essential businesses here, along with sweeping actions by his peers in California, New York, Illinois, New Jersey and Ohio are all based on math and the urgent need to take truly drastic measures to avoiding a runaway exponential function in human illness.<\/p>\n

Among others who have investigated coronavirus\u2019s exponential math in depth \u2013 and advocated powerfully for physical distancing and other measures to thwart that math \u2013 include a team at Imperial College London<\/a> and the analyst and entrepreneur Tomas Pueyo<\/a>.<\/p>\n

\u201cWhen you’re on an exponential curve every moment is dangerous,\u201d Francis Collins, the director of the National Institutes of Health, told<\/a> the USA Today<\/em>. \u201cThis is a particularly critical moment for us to\u00a0try to bring all the resources and determination of government and the American people to try to get off of it.\u201d<\/p>\n

The coronavirus math doesn’t lie<\/strong><\/h3>\n

Getting off that curve means physical distancing, vastly expanded coronavirus testing, case-tracking, and other measures that contribute to the now-famous nugget \u201cflattening the curve<\/a>.\u201d (Pueyo covers these measures in great depth here<\/a>).<\/p>\n

Despite all of this, there has been skepticism in some corners. Yes, one might argue, but most people don\u2019t get that sick, right? True enough: about 80% of patients have mild to moderate symptoms<\/a> \u2013 these include high fevers, nasty coughs, stomach problems, and \u201cmild to moderate\u201d breathing difficulties. And young people, listen up: you\u2019re not immune. Nearly 40% of patients sick enough to be hospitalized in the United States have been age 20 to 54.<\/p>\n

Either way, 10% or so of COVID-19 patients end up \u201cseverely ill\u201d and hospitalized, and perhaps 4% of the overall total become critical in intensive care units. The math here is simpler. And math, it turns out, is important.<\/p>\n

The American Hospital Association counts<\/a> 6,146 U.S. hospitals with 924,2017 beds. That includes about 70,000 ICU beds once you subtract neonatal and pediatric ICUs. There will be some surge capacity in terms of adding ICU beds, as we\u2019ve seen in Italy and, in particular, China.<\/p>\n

\"A
Practicing physical distancing so we don’t infect others is critical now to change the coronavirus math. Photo: Getty Images.<\/figcaption><\/figure>\n

There will be limits on critical care beds as well as on the number of available ventilators and extracorporeal membrane oxygenation (ECMO) machines that people with serious COVID-19 cases may need to survive as their bodies clear virus. Also, there are only so many doctors, nurses, and staff trained in emergency medicine and critical-care, and some will inevitably become ill and have to take time off. Maybe even as many as 20% for two weeks at a time.<\/p>\n

Estimates vary, but without the curve-flattening that physical distancing, case quarantining, and other steps require, the numbers of very sick \u2013 while small in percentage terms \u2013 are expected to far exceed the health care system\u2019s ability to care for everyone who needs care. Also important, there is the impact of not being able to care for \u201cregular\u201d illness like heart attacks, stroke and other emergencies which do not slow down.\u00a0 Abiding by the requests in the near term to keep our distance from one another and to stay home if we are sick, however, can sap the exponent\u2019s power. If we abide by orders to change our behavior drastically, we will also buy valuable time to develop therapies and vaccines, build medical-system capacity, and train and retrain medical staff.<\/p>\n

\n

For all updates and to read more articles about the new coronavirus, please visit uchealth.org\/covid19<\/a><\/h4>\n<\/div>\n

That\u2019s \u201cus\u201d because we\u2019re all in this together, and the better we understand the exponential nature of coronavirus, the more conviction we will have in playing our part in what\u2019s shaping up to be a monumental battle against a stubborn microscopic foe. Our success will enhance our odds of following the paths of Korea, Japan, Singapore, and, of late, China, in keeping caseloads below capacity and saving many lives along the way.<\/p>\n

Dr. Zane called on all of us<\/a> to make sacrifices now so we can save lives in the months ahead.<\/p>\n

\u201cThere is no question that consistently practicing physical distancing will require personal sacrifice and at times may be painful, but lives depend on it and that life may be your loved one or mine,\u201d he said.<\/p>\n

\u201cThe United States, Colorado, your friends and family need you to do this and you need everyone else to as well.\u201d<\/p>\n","protected":false},"excerpt":{"rendered":"

We in Colorado and many around the country are now taking extraordinary measures to try stem the tide of the coronavirus pandemic sweeping across Colorado, the US and the globe. Gov. Jared Polis has issued a statewide “stay-at-home” order. Our schools and most offices are closed. 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