Daily Status, Sept. 5

 Daily Status, Sept. 5:

Reminder:  any sections that are unchanged since yesterday are grayed out.

I fixed the problem with the age plot.

I have added ODU to the college charts.

Summary/Situational Awareness

Usually, during the pandemic, at a given time, parts of the commonwealth have low case counts, parts have high...some areas are improving, and others are getting worse.  That remains the case now, with one group growing at 13% per day, while the state (excluding that group) is decreasing at about 2% per day.  But, the poor performing group is not geographically defined, rather it is students at colleges.  The good news is few of the hospitalizations are from college students (possibly 1 from VA Tech, 2 from JMU, and 2 more throughout the state).  In terms of numbers, the schools that were having issues (UVA, VT, Radford, JMU, VCU) continue to have issues.  The other schools are doing ok.  

Across the commonwealth, there were 948 reported new cases .  This is nearly exactly inline cases in the last three week.  Overall, cases are increasing at just over 1% per day. It is worth noting that 21% (198) of the cases are directly related to colleges.  Regionally, all parts of VA are increasing except NOVA and eastern VA. SW VA & NW VA are leading the pack, largely the result of the outbreak at Radford, VT, and JMU.  The testing numbers across the state remain ok, but not great, at around 7% positive.  I would like to see the overall positive rate under 5%

Outside of college towns and a few smaller cities/towns, the state is doing well. In fact, 20% of the cases are affiliated with a combination of Radford, JMU, VT, UVA, and VCU; those schools account for 1.5% of the population.


Over the last several weeks, we have seen a trend where the more rural parts of the state, with a few isolated large colleges have been trending poorly compared the more urban setting (even if those with colleges).  For example, Hampton Roads and NOVA have not seen impacts with the colleges reopening whereas SW & NW are being swamped.  In particular, the New River area is showing 0.7% of the population positive in the last 10 days or so.  This is 100% the result of the annual migration of college students to Blacksburg and Radford.  

The three week growth rates are (in fraction per day)

NOVA: 1.001 -- GMU

Central VA: 1.011 -- UVA & VCU

Hampton Roads/Eastern VA:  0.980 -- W&M, CNU & ODU

SW VA: 1.025 -- VT & Radford

NW VA:  1.021-- JMU


The state as a whole is is increasing at 1.011.

The following charts are for the 5 regions/trends.  Again, SW VA, even with the lower population, has more cases than any other region.

Local/Northern VA:

The overall trend in Northern Virginia indicates, that after correcting for testing, the case load has dropped by more than a factor of 10x since our early may peak, though significantly higher than the early July minimum.  However, over the last several weeks, Northern VA has been essentially flat, at about 240 new confirmed cases a day, but over the last week, has started to increase again.  The current rate is  more than twice the rate from early July (120 / day), but down from about 3000 cases per day at the peak (because of the availability of testing, 40% of the tests were positive in northern VA, indicating that only 1 in 8 cases were confirmed).  Hospitalizations and deaths are also down from the peak, but up in the last month.

Right now, no jurisdiction is increasing by more than 1%.  But, Fairfax and NOVA is increasing.  A 1% increase (1.01 Rt) is doubling in 70 days.  

Fairfax Co.: 1.006
Arlington Co.: 0.973
City of Alexandria: 0.977
Prince William Co.: 0.998
Loudoun Co.: 1.011

The growth rate is defined as Rt, or the growth time constant.  Simply, todays number are approximately the growth rate times yesterday's numbers.  This is the exponential time constant.  Fortunately, the time constants are about 1, and our rate of cases is about 7/100,000 per day.  Ideally, we would be 0, but 7 is much better than our peak in which was around 30/100000K. 

About 10 day ago, Arlington began enforcing social distancing guidelines. Since then, there trend has gone from 1% per day to -5% per day.

What is most noteworthy of the NOVA Zip code map is the the overall lack of contrast:  the bad areas are doing better, and the good areas are doing worse, with the exception of two areas near the fringe of "Northern VA".  (The state would call those NW VA). 

In Fairfax County, the cases are about static over the last few weeks.  By comparison, Arlington and Alexandria are showing significant declines since Arlington started enforcing social distancing in late August.

Age Distribution: 

First of all, I fixed the problem with this chart.

The trends/growth for the the middle aged gas dropped to be similar to the teen/tween and elderly. If we look at state-wide numbers, we see a very different trend set:  all ages are doing well except those that include college ages (18-24).  
             <10        10-19.    20-39.     39-59.     60+
  NOVA  1.0134    1.0070    1.0107    1.0098    1.0086
  AllVA   0.9912    1.0224    0.9989    0.9877    0.9927

Unfortunately, I can not parse out 18-24 seperate from the other groups.


Before I get into details, there are at least three COVID hospitalizations in colleges that are from ages consistent with college students.  2 at JMU, one at VT.  There could be more, if upon admission, the student gave the home address.

RED means there is clear evidence for community spread
YELLOW means there may be community spread; still ambigious
GREEN means no evidence of community spread
BLACK means they went online.


% Positive

VDH Cases*

Estimates Cases**

Dasshboard Cases

% of population infected ***

Va Tech




























































* VDH cases are based on the cases either in the zipcodes containing the student population or the community.  In addition, I remove the rate of cases prior to students arriving on campus
** estimated number of cases is an attempt to normalize for testing limitations. Specifically, I assume at 5% positive, 100% of the cases would be caught. so I normalize it to that value.  If the % positive is very high (>40%) I am likely overestimating the numbers.
*** Dashboard cases are only counted if I can find the dashboard.  In some cases, it is difficult to distinguish positive tests from cases (1 case may have multiple positive tests; that is mostly at VT).  I include active cases if reported, otherwise, I use total cases.
****% population uses the total reported number of students rather than just those on campus; it may be off when the percent positive is above >40%.
***** Old data, not updated for today.

Large Scale Community Spread:

RADFORD (linked to the university Dashboard)

Radford administration seems to think the virus is under control, according to press reports.  However, as long as the percent positive is running more than 50%, it tells me they are missing a lot of positive cases.  I can not assess how things are:  they are testing at full capacity; the growth rate in confirmed cases reflects the testing ability rather than the caseload. At this point, my only recommendation is to perform serology/antibody studies to retrospectively determine the number of cases.   Radford tested the students prior to arrival, but allowed students on campus prior to the test results.


JMU is going on line.  JMU has been fairly transparent with the situation, but could not get ahead of it.  At this point, it is mitigation.    If you have a student from JMU, try to get them tested prior to bringing them home, and it would be advisable to assume the student is infected.  There are now two hospitalizations in Harrisonburg that are of the age group expected for College students.  JMU did not require testing prior to arrival on campus.
We have seen the prevalence of the virus in Blacksburg increase with the return of the students.  Estimates indicate more than 2% of the student body is positive. VT will start updating the dashboard each day next week.   The school has a plan, but is not clear how much impact the plan is having on off campus students.  The rate of infection may be at tipping point. VT claims there is no uncontrolled community spread, but the data does not support that assertion. Virginia Tech tested only on-campus students.  


VCU is showing signs of community spread.   VCU's problem, though is the space for isolation is and quarantine is near capacity.  Being in an urban setting the zip-code and regional surveillance that works well at some of the other schools is not particularly helpful here.  So, I have to rely on the dashboard.  

The With the students return, there has been a marked increase in cases.  It appears there is community spread. And it is growing.  Between the increase in the percent positive and the absolute numbers increasing, UVA is trending in the wrong direction.  UVA tested all students prior to arrival on campus.

 Watch List: emp[tu

Other schools:

William & Mary -- so far so good -- No evidence of community spread (no cases with several thousand students on campus now.   Currently, the upperclassmen are returning to campus.   It is worth noting that pre-arrival testing has identified 20 cases, which were not allowed on campus. W&M will retest all students next week. W&M tested all students prior to arrival in town. 

CNU -- Just reopening; looks ok but the student have not been present long enough to see community spread.

ODU -- Nothing noteworth; I do not know where the dashboard is.

UMW -- Not open yet.

GMU -- Nothing noteworthy.  GMU tested all students.


Based on the above charts, the issue is no longer the communities.  The issue is the campuses.  We are seeing the growth in New River (VT/Radford) and Harrisonburg.  The sad thing is those communities had the lowest numbers prior to the students return.    


I try to keep my political biases out of it.  Unfortunately, some politicians have turned data into a political issue.  Yesterday, while driving home, I heard a prominent politician state that the America's numbers would be much better if we excluded NY.  I am not sure when the quote was captured.  But, I am a data and science person; based on that, I wonder how policy can follow when data is fabricated.  The data for cases in the USA, with and without NY are shown below. In April, our cases there about 50% NY, since then NY has been doing better.  Since June 1, NY has accounted for 1.5% of the cases nationally, even though it has 5.8% of the population.  So, currently, NY is outperforming the country.  Even including the early days, NY is at 7.2% the cumulative cases, about 25% higher than you would expect.  By comparison, Florida accounts for 10.2% of the cases but 6.3% of the population.  And FL should have known better.  (VA is at 2% of all cases, and 2.5% of the population).

The numbers do not lie.


1) You can repost / share in the entirety by forwarding the link, 2) If you want share partial content, you must receive my permission – I need to make sure you understand what I am saying. If anyone sees this work being used without attribution, please let me know as soon as possible. I am willing to have an informed discussion / debate on my approach, but I want to make sure the proper context is captured.


Source data is from the Virginia Dept of Health COVID Site

Why I did this:  About the blog

State Actions: Impact on Growth:  TBD

Figure Descriptions:  TBD

Other Sites:  John's Hopkins

Kids can pass covid to parents: Pediatric SARS-CoV-2: Clinical Presentation, Infectivity, and Immune Responses

A fun video showing masks work, guy style:


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