Imposing a stay-at-home order sooner rather than later ha a profound effect on how many people come down with coronavirus.
The person-to-person spread of the coronavirus in the Houston region would peak in two weeks and burn out by mid-May if the stay-at-home order invoked Tuesday is continued until then, according to modeling by local scientists.
The modeling, which informed Harris County Judge Lina Hidalgo’s order, considered the effect on the spread of COVID-19, the illness caused by the virus, if she’d taken the stringent intervention immediately or waited a week or two weeks to act. Spread would increase exponentially had she waited, it found.
“From our modeling, it was clear that waiting is not a good thing,” said Eric Boerwinkle, dean of the University of Texas School of Public Health, who conducted the study with a biostatistician at that Houston institution. “The numbers are sobering, but the message is clear: early intervention is better than late intervention and more stringent intervention is better than less stringent.”
UTHealth released the modeling data as the city of Houston began gearing up — scouting sites that easily can be converted into medical centers, looking for hotel rooms for COVID-19 patients who cannot isolate at home or in a hospital — for what’s expected to be the next, worse phase of the pandemic: the exponential increase in disease numbers.
The UTHealth modeling, shared with city and county officials Monday, provided data backing the warnings. It found that intervening immediately would limit the number of cases in the region to a peak at about 150 a day around April 7 and stop the spread around May 12. In that time, the cumulative total of cases would reach nearly 3,500, it found.
Cases would peak at more than 1,000 a day on April 15 if Hidalgo had waited a week and more than 6,600 a day on April 22 if she’d waited two weeks. Transmission would last until May 29 under the first scenario and June 16 under the second.
All three of the scenarios are based on the premise the restrictions would continue until mid-May. Hidalgo’s order is scheduled to expire April 3.
This is what “exponential growth” means. The basic idea is that if everyone is out there living their normal lives, anyone who has coronavirus – remember, it takes about a week for people to become symptomatic, so you can be walking around for quite some time not knowing you have it, infecting people wherever you go – will be spreading the disease to a larger number of people, who will then do the same thing, than if everyone were at home where they will encounter far fewer people. This is one of the reasons why South Korea was as successful as it was at stopping the spread in that country – they jumped on this kind of action right away. (They also did a crapload of testing and were able to aggressively track people’s movements, but never mind that for now.) For that matter, look at the difference between Kentucky and Tennessee. Which outcome would you prefer?
Point is, putting the stay-at-home restrictions in place now, or even later, after the disease has had time to spread even if the known number of infections is still low, would mean we’ve given it an unfettered head start. That’s the scenario we need to avoid, and it’s the reason why the death wish cultists aren’t just wrong, they’re deeply dangerous. Listen to the experts. The fondest hope we have right now is that in a few weeks, when we can think about beginning to go back to normal, we can say it wasn’t nearly as bad as it could have been. We have a chance for that now.
UPDATE: Read this. Look at the chart. Consider this excerpt: “It means that on average, every infected person infects three other people, not 2.5 other people—which makes the spread of the virus much wider and faster. Without any control measures, for example, it means that after ten generations a single person will be responsible for 80,000 infections instead of 10,000 infections.” That’s what we’re talking about here.