Did the Sturgis rally lead to 250,000 new cases?



This morning, the Washington Post briefly mentioned a new paper from San Diego State University that says the ten-day Sturgis, SD motorcycle rally, which attracted about 500,000 people in early August, probably led to 250,000 new cases nationwide, or one fifth of total new cases reported in the US from August 2 through September 2. The paper also states that the public health cost of this event will be over $12 billion.

Of course, Gov. Kristi Noem staunchly defended allowing the rally to proceed, saying she wouldn’t dream of violating the principle that everyone is personally responsible for their own actions. So she needs to live up to her words and take personal responsibility for that $12 billion, as well as the probably hundreds of deaths that will result from her decision. I suggest she start diverting her paycheck to the US Treasury starting tomorrow. She’ll have the whole bill paid off in 60,000 years, no problem.

The numbers
These numbers are updated every day, based on reported US Covid-19 deaths the day before (taken from the Worldometers.info site, where I’ve been getting my numbers all along). No other variables go into the projected numbers – they are all projections based on yesterday’s 7-day rate of increase in total Covid-19 deaths, which was 3%.

Note that the “accuracy” of the projected numbers diminishes greatly after 3-4 weeks. This is because, up until 3-4 weeks, deaths could in theory be predicted very accurately, if one knew the real number of cases. In other words, the people who are going to die in the next 3-4 weeks of Covid-19 are already sick with the disease, even though they may not know it yet. But this means that the trend in deaths should be some indicator of the level of infection 3-4 weeks previous.

However, once we get beyond 3-4 weeks, deaths become more and more dependent on policies and practices that are put in place – or removed, as is more the case nowadays - after today (as well as other factors like the widespread availability of an effective treatment, if not a real “cure”). Yet I still think there’s value in just trending out the current rate of increase in deaths, since it gives some indication of what will happen in the near term if there are no significant intervening changes.

Week ending
Deaths reported during week/month
Avg. deaths per day during week/month
Deaths as percentage of previous month’s
March 7
18
3

March 14
38
5

March 21
244
35

March 28
1,928
275

Month of March
4,058
131

April 4
6,225
889

April 11
12,126
1,732

April 18
18,434
2,633

April 25
15,251
2,179

Month of April
59,812
1,994
1,474%
May 2
13,183
1,883

May 9
12,592
1,799

May 16
10,073
1,439

May 23
8,570
1,224

May 30
6,874
982

Month of May
42,327
1,365
71%
June 6
6,544
935

June 13
5,427
775

June 20
4,457
637

June 27
6,167
881

Month of June
23,925
798
57%
July 4
4,166
 595

July 11
5,087
727

July 18
 5,476
782

July 25
 6,971
996

Month of July
26,649
860
111%
August 1
8,069
1,153

August 8
7,153
1,022

August 15
7,556
1,079

August 22
7,552
1,079

August 29
6,675
954

Month of August
30,970
999
116%
September 5
5,961
852

September 12
5,956
851

September 19
6,140
877

September 26
6,329
904

Month of Sept.
25,644
855
83%
Total March – September
213,385


Red = projected numbers

I. Total deaths
Total US deaths as of yesterday: 193,541
Deaths reported yesterday: 288
Percent increase in total deaths in the last seven days: 3% (This number is used to project deaths in the table above; it was 4% two days ago. There is a 7-day cycle in the reported deaths numbers, caused by lack of reporting over the weekends from closed state offices. So this is the only reliable indicator of a trend in deaths, not the three-day percent increase I used to focus on, and certainly not the one-day percent increase, which mainly reflects where we are in the 7-day cycle).

II. Total reported cases
Total US reported cases: 6,485,837
Increase in reported cases since previous day: 25,416
Percent increase in reported cases in the last seven days: 5%  

III. Deaths as a percentage of closed cases so far in the US:
Total Recoveries in US as of yesterday: 3,758,629
Total Deaths as of yesterday: 193,541
Deaths so far as percentage of closed cases (=deaths + recoveries): 5%
For a discussion of what this number means – and why it’s so important – see this post. Short answer: If this percentage declines, that’s good. It’s been steadily declining since a high of 41% at the end of March. But a good number would be 2%, like South Korea’s. An OK number would be 4%, like China’s.

IV. 7-day average of test positive rate for US: 5.4%
For comparison, the recent peak for this rate was 27% in late July, although the peak in late March was 75%. This is published by Johns Hopkins (recent rates for New York state: .8%. For Texas: 11.2%. For Florida: 12.3%.  For Arizona: 7.2%).

I would love to hear any comments or questions you have on this post. Drop me an email at tom@tomalrich.com

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