COVID-19 Spread: Updates from the Washington Post - Updated

When a novel virus spreads, it's important to have access to trusted sources of information. Here's an article from the Washington Post regarding the spread of the COVID-19 virus around the world. This article will be updated from time to time.

Here's the link: https://www.washingtonpost.com/world/2020/01/22/mapping-spread-new-coronavirus/?arc404=true

One more thing ... if you take a look at the end of the article, there's a table of history of various diseases. One of the things that I did, was from the data provided to determine the death rate of COVID-19. Using the reported numbers, the death rate is 3.46%. (86013 inflected and 2977 deaths.) That could be high because not all COVID-19 cases are likely to have been detected. 

I updated the parameters in my quick model to 1) number of persons that an infected person would infect = 2 and 2) death rate = .0346. Number for multiple generational points = 75. 

This is what the model produced:

Generation	0	1	2	3	4	5	6	7	8	9	10	11
Number infected in Generation	1	2	4	8	16	32	64	128	256	512	1,024	2,048
Running total infected	1	3	7	15	31	63	127	255	511	1,023	2,047	4,095
Total deaths	0	0	0	1	1	2	4	9	18	35	71	142
Multiple Origination Points Infected	75	150	300	600	1,200	2,400	4,800	9,600	19,200	38,400	76,800	153,600
Running total infected	75	225	525	1,125	2,325	4,725	9,525	19,125	38,325	76,725	153,525	307,125
Total deaths	3	8	18	39	80	163	330	662	1,326	2,655	5,312	10,627

UPDATE: Of note, I reported the COVID-19 death rate as 3.46% based on the numbers supplied by the Washington Post in the article shown above. I reported that value as a death rate with caveats. However, about a week after I stated the above COVID-19 death rate, the World Health Organization (WHO) reported a death rate of 3.4%. I was about to alter my death rate to 1% based on recent reporting. But for now I'm not going to update what my model has predicted with respect to the number of deaths until I receive an updated number from WHO or the CDC.

Changing the number for multiple generational points to 42, here's what you get:

Generation	0	1	2	3	4	5	6	7	8	9	10	11
Number infected in Generation	1	2	4	8	16	32	64	128	256	512	1,024	2,048
Running total infected	1	3	7	15	31	63	127	255	511	1,023	2,047	4,095
Total deaths	0	0	0	1	1	2	4	9	18	35	71	142
Multiple Origination Points Infected	42	84	168	336	672	1,344	2,688	5,376	10,752	21,504	43,008	86,016
Running total infected	42	126	294	630	1,302	2,646	5,334	10,710	21,462	42,966	85,974	171,990
Total deaths	1	4	10	22	45	92	185	371	743	1,487	2,975	5,951

So based on the assumptions embedded in the model (and these are speculative assumptions ... please note that fact) the current state of spread of and the number of deaths from the COVID-19 virus has 42 points of origination, spread over 10 generations where the person-to-person infection rate is 2.0 and the death rate is .0346. 

This also suggests that the spread to the next generation could result in a substantial jump in the number of cases (5 figures to 6 figures) as well as well as in the number deaths. But as with all things monitoring the data and updating the model with the new data is essential.

Update

From NBC News, I received a new person-to-person infection rate and the seemingly minor change makes a pretty significant change in the numbers. Here are the parameters: 1) person-to-person infection rate = 2.2, 2) death rate remains at .0346 and the number of origination points = 39 (to match up with current data). Here's the table:

Generation	0	1	2	3	4	5	6	7	8	9	10	11
Number infected in Generation	1	2	5	11	23	52	113	249	549	1,207	2,656	5,843
Running total infected	1	3	8	19	42	94	207	456	1,005	2,212	4,868	10,712
Total deaths	0	0	0	1	1	3	7	16	35	77	168	371
Multiple Origination Points Infected	39	86	189	415	914	2,010	4,422	9,728	21,402	47,083	103,584	227,884
Running total infected	39	125	314	729	1,642	3,652	8,074	17,802	39,204	86,287	189,871	417,755
Total deaths	1	4	11	25	57	126	279	616	1,356	2,986	6,570	14,454

To reach the current number of reported infected people with 39 originating people is the 9th generation as opposed to the 10th generation. Also the jump in numbers to the next generation suggest that approximately 18,000 more people will be infected than in the previous table. 

The point I want to make is that even a slight uptick in the infection rate can have significant consequences.  This is why testing is so important. Keeping the infection rate down makes the epidemic more manageable. This is why informing the public regarding what they should be doing to not become or lower the chances of being infected is so important. This is why having competent people managing this public health emergency is so important. 

The Trump Administration

However, it seems that at the level of the Trump Administration, we have people who have no idea of what to do. Who have been denial for weeks about the likely spread of the virus outside of China and into the US. Trump's recent decision to restrict travel to and from Iran, Italy and South Korea in addition to China is not only short sighted, but utterly inane. The virus is in the US, it is spreading in the US. It's too late for travel restrictions to have any real effect. And besides, travel restrictions only buy you time to prepare, something the Trump Administration neglected to do in it's state of denial about how the virus could spread to the US.