Tennis & Coronavirus

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Chas Tennis

G.O.A.T.
Two of the issues might be
1) how to reduce Coronavirus transmission at our tennis courts?
2) what is going to happen with tournaments?
3) others

For example, carry disinfecting hand sanitizers or wipes? Have some available at the courts?

But

"There is a lot of advice emphasizing cleaning the hands.

If a person gets Coronavirus through their hand by touching their eyes or other body part, does the virus move through the body and seek out the lungs?

But if infections are occuring mostly by directly inhaling the virus, the emphasis should be on filtering and distancing, I guess.

Any links on this issue?

Chas Tennis"

This long thread regarding Photography and the Coronavirus has some interesting posts.

It seems that this is the time to collect information and discuss the Coronavirus. With the membership, we might get a world perspective here.
_______________________________________________________________________________________________________________________________________________________________

INDEX to some posts in this thread:

2003 SARS Analysis
https://tt.tennis-warehouse.com/index.php?threads/tennis-coronavirus.664757/page-6#post-14196512

Some observations of coughs, sneezes and breathing. Are there some fine particles being produced?
https://tt.tennis-warehouse.com/index.php?threads/tennis-coronavirus.664757/page-6#post-14195689

One Hopkins expert mentions aerosol/airborne and another mentions large droplets and dismissed aerosol/airborne.
https://tt.tennis-warehouse.com/index.php?threads/tennis-coronavirus.664757/page-5#post-14193999

Particle size & lung penetration
https://tt.tennis-warehouse.com/index.php?threads/tennis-coronavirus.664757/page-5#post-14192296

USA Today - what does this article and its picture of the face say about the advice to not wear a mask?
https://tt.tennis-warehouse.com/index.php?threads/tennis-coronavirus.664757/page-5#post-14191371

The penetration of particles into the Thoracic lungs vs particle size.
https://tt.tennis-warehouse.com/index.php?threads/tennis-coronavirus.664757/page-5#post-14190460

Larry Brilliant statement. The interview was on TV.
https://tt.tennis-warehouse.com/index.php?threads/tennis-coronavirus.664757/page-5#post-14189911

Rachael Maddow and McNeil on the Chinese halting the virus.
https://tt.tennis-warehouse.com/index.php?threads/tennis-coronavirus.664757/page-4#post-14183365

Maddow & Dr Ho a Dr that had successes on the HIV virus.
https://tt.tennis-warehouse.com/index.php?threads/tennis-coronavirus.664757/page-4#post-14185354

First thoughts about tennis courts
https://tt.tennis-warehouse.com/index.php?threads/tennis-coronavirus.664757/page-4#post-14185429

Masks & Wuhan.
https://tt.tennis-warehouse.com/index.php?threads/tennis-coronavirus.664757/page-3#post-14178900

Surgeon General's advice on masks.
https://tt.tennis-warehouse.com/index.php?threads/tennis-coronavirus.664757/page-3#post-14178733

PurpleAir sensors and observations of airborne particles, size 0.3 um, from cooking smoke in my condo and outside. The virus size is 0.1 um and it is believed to be emitted in droplets. Large droplets fall to the ground in under 6 feet and small ones are airborne or aerosols.
https://tt.tennis-warehouse.com/index.php?threads/tennis-coronavirus.664757/page-3#post-14179090

Reference discussing viruses, viruses in large droplets, viruses in small droplets, and 'droplet nuclei' or what is left over after water in droplets evaporates in the air. Important work started with the work of F. Wells (1934). Maybe what is said in these references has been disproved, if so, we need references for that.
https://tt.tennis-warehouse.com/index.php?threads/tennis-coronavirus.664757/page-3#post-14179595

Chinese government treatment of Covid 19 with many facts.

PurpleAir Sensors and monitoring monitoring outside your home and inside.

This is what I currently think is most reasonable regarding transmission.(3/22/2020)

WHO report on China visit with many original source observations. Maria Van Kerkhove
 
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Chas Tennis

G.O.A.T.
Slide show on viruses.

The size distribution of viruses is pretty wide.

"A virus is an infectious agent of small size and simple composition that can multiply only in living cells of animals, plants, or bacteria. They range in size from about 20 to 400 nanometres in diameter (1 nanometre = 10-9 meters). By contrast, the smallest bacteria are about 400 nanometres in size.
https://courses.lumenlearning.com/boundless-microbiology/chapter/overview-of-viruses/
Overview of Viruses | Boundless Microbiology - Lumen Learning"

A wavelength of light is in the 400-680 nm range or so. This means that you cannot examine the structure of a virus using a light microscope, you need an electron microscope that works with a wavelength much less than the size of the virus.
 
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Raul_SJ

G.O.A.T.
There have been ZERO deaths in the U.S. while thousands have died from the flu.
Stay calm. Do not panic. Take the same precautions as for the flu (provided you are otherwise healthy and not in high risk group).

We need to keep a proper perspective on this.

 
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Chas Tennis

G.O.A.T.
There have been ZERO deaths in the U.S. while thousands have died from the flu.
Stay calm. Do not panic. Take the same precautions as for the flu (provided you are otherwise healthy and not in high risk group).

We need to keep a proper perspective on this.

This post discusses the flu and a New Zealand study of the effect of a pandemic.
 

Searah

Semi-Pro
i've heard from a few friends that some of the chinese opponents refused to shake hands at end of match due to corona concerns. but they've been passing the ball back and forth with there hands for hours so you'd think they could catch it that way regardless. /breathing same nearby air?

way i see it.
it's just badluck if you catch it.
 

Pctopcool

Rookie
There have been ZERO deaths in the U.S. while thousands have died from the flu.
Stay calm. Do not panic. Take the same precautions as for the flu (provided you are otherwise healthy and not in high risk group).

We need to keep a proper perspective on this.

This thing spread exponentially. The current number means nothing. If left uncontrolled, it's a matter of weeks to reach the level in Wuhan, which will likely overwhelm the healthcare system here. The death rate will likely pick up if that happens.

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Raul_SJ

G.O.A.T.
This thing spread exponentially. The current number means nothing.
Doesn't the flu spread exponentially as well?

The numbers are not in yet from China regarding the numbers recovered. We do know that the official deaths is about 3000.
 

Pctopcool

Rookie
The death rate of this virus is more than 10 times higher than the common flu that we had in the recent years. And it's as contagious as, if not more so than, the flu. They are totally different beasts.

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Addxyz

Professional
There have been ZERO deaths in the U.S. while thousands have died from the flu.
Stay calm. Do not panic. Take the same precautions as for the flu (provided you are otherwise healthy and not in high risk group).

We need to keep a proper perspective on this.

False. There was one this morning. https://www.cnn.com/2020/02/29/health/us-coronavirus-saturday/index.html

The problem now is that it's being spread by folks that did not travel from China. It's even being spread by asymptomatic people.
 

Chas Tennis

G.O.A.T.
* The population of Wuhan China is 11.8 million.

* If anyone finds the size of the Covid 19 virus please post the link. If it is in the range or 20-400 nm then certain filters may be useful for the larger size range. ??
 
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Chas Tennis

G.O.A.T.
World Health Organization

Situation daily report for March 1

See SURVEILLANCE table. For cities in China, I believe that Wuhan has a population of 11.8 million. Wuhan is located in Hubei which has a population of about 59 million.

See especially the curves of cases outside China in Figure 2. Note the daily changes through February.
"Figure 2. Epidemic curve of confirmed COVID-19 cases (n=6567) reported outside of China, by date of report and WHO region with complete days of reporting through 29 February 2020"

This graph looks similar to Figure 2 of the Epidemic curve of the WHO website. Note the time scale and changes over the last two weeks.



We can all just look at this table and graph each day or week and get an idea of what is going on world wide.

I'm in full panic mode until I find some information clearly showing why the situation should turn around.
 
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Addxyz

Professional
* The population of Wuhan China is 11.8 million.

* The word corvid means of the crow family. Has it been stated that Corvid 19 originated from a bird or crow?

* If anyone finds the size of the Corvid 19 virus please post the link. If it is in the range or 20-400 nm then filters may be useful for the larger size range. ??
It's not CORVID. It's COVID. COVID 19 stands for COrona VIrus Disease 2019.


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Ruark

Professional
This is more than just media hype. Yes, we had about 60,000 deaths from flu last year, But that's out of over 40,000,000 *reported* cases, a fatality rate of less than 1/100th of 1 percent. Plus, we have protocols, vaccines, treatments, seasons, etc. for it, and the fatalities are invariably elderly or people with compromised health. With coronavirus, fatality rates go anywhere from 1 to 15 percent, with no vaccines, no treatments, a latency period of up to a month during which it's communicable, and we're not even sure how it's communicated yet. This saga is still unfolding, and no telling where it's going to end.
 

BBender716

Semi-Pro
For severity, ironically, a good place to look is at the markets. You can compare the Ebola impact on the markets versus what we're seeing right now. It's the latency and communicability that has caused this to be taken extremely seriously by governments and businesses. I work at a big bank and they cancelled all international travel, domestic travel for anyone who isn't visiting a client, and is requiring people to register their personal travel if visiting any country on an internal "list". And when they return, a mandatory 14 days work from home period.

They are not screwing around and markets are reflecting that.

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sredna42

Hall of Fame
LOL at this thread

but if you want a serious suggestion, don't shake hands for starters. That whole tradition of having to shake hands at the end of a match needs to dropped.
Man I hate having to shake someone's slimy hand after a match, dumbest idea ever.
 

BBender716

Semi-Pro
I am a freelance photographer, and many of my clients cancelled all travel too. I do a lot of high end international work, so this situation will have a large impact on a small business like mine.

Do any of you think that the FFP 3 mask will actually protect you ?
No. The rule of thumb for most retail masks is it really helps you to stop spreading it if you are contagious but does not protect you from getting it.

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Chas Tennis

G.O.A.T.
No. The rule of thumb for most retail masks is it really helps you to stop spreading it if you are contagious but does not protect you from getting it.
Do you have any links for that piece of information. I have only recently heard that during this coronavirus epidemic. ?

I would guess that most retail masks are sold for dust from miscellaneous sources like tools.

Besides if they reduce virues getting out why shouldn't they help prevent them from getting in also?
 

Harry_Wild

G.O.A.T.
If you stay 6 feet or further from anyone who has it, you will be safe! Otherwise you have to have at least a N95 class surgical mask! N99 is better. P100 would be 100%! Of course, any military grade gas mask from 1990s on would be the best protection. Gas mask degrade over time so the latest is the best! If you have the dough, mask with it own oxygen supply is the most comfortable to use and the safest too. A eye shield is recommended too!

Best to not travel to areas that have a large outbreak of Coronavirus!
 

Kobble

Hall of Fame
If you stay 6 feet or further from anyone who has it, you will be safe! Otherwise you have to have at least a N95 class surgical mask! N99 is better. P100 would be 100%! Of course, any military grade gas mask from 1990s on would be the best protection. Gas mask degrade over time so the latest is the best! If you have the dough, mask with it own oxygen supply is the most comfortable to use and the safest too. A eye shield is recommended too!

Best to not travel to areas that have a large outbreak of Coronavirus!
P100 is not a 100%. It is at least 99.97% for 0.3 micron particles. For 1 micron it is about 99.999%.
 

Chas Tennis

G.O.A.T.
P100 is not a 100%. It is at least 99.97% for 0.3 micron particles. For 1 micron it is about 99.999%.
Viruses have a size listed as 20-400 nm or 0.02-0.4 micron (micrometer). See post #2.

But I have not found the size of this Coronavirus.

There are complications and seemingly inconsistent data on some filter specs for how they handle the smaller sizes. For example, some filters claim static electric effects to help trap particles and those effects might trap smaller particles than their specs show with some % efficiency. ?

If an infected person is wearing a mask and exhales with virus infected droplets and those droplets are trapped, then what? It seems as if the droplets would evaporate and might free some of the virus. ? I don't assume that evaporating infected droplets in masks has been researched.

Everyone is using a lot of cut-and-paste information. I think telling uninfected people not to wear masks is very questionable. I don't believe that it makes sense. Why doesn't wearing a mask reduce virus entry for everybody?

I wore an P100 mask with a rubber face seal when we had smoke from the Camp fire in 2018. I took it off after 15 or 20 minutes because the air resistance made me uncomfortable.

Maybe a HEPA air cleaner would reduce viruses in the air to some extent. But you need solid information to determine that.

I'm certain that I don't have the information that I need......................
 
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Kobble

Hall of Fame
Viruses have a size listed as 20-400 nm or .02-0.3 micron (micrometer). See post #2.

But I have not found the size of the Coronavirus. There are complictions and seemingly inconsistent data on some filter specs for how they handle smaller sizes.
I read the virus is about 100-120 nm, or 0.1 micron. It is more than likely not flying around that small, and is attached to other moisture and particles making it bigger. I saw one study that measured only 42% of flu particles from measured coughs were under 1 micron, and influenza is listed as 90-120 nm. I assume it is rare that this virus particle will be around 0.3 micron. This virus, from what I can make of it, is basically SARS round two. SARS was clearly airborne over hospital room distances, and they proved it with capture devices. Filter theory is pretty complicated, but every mask material I looked up that was put against virus particles, performed better than its rating. N95's only let like 0.5-2% of 0.1 micron through. N100 were 99.98-99.998% against 100 nm. There are alot of idiots just parroting what they hear on tv about N95 are useless, or even harmful. Chances are, if you are using N95 or better, and it seals well, you should be ok. I have P100 and a gas mask, but I still wouldn't unnecessarily test it by going into a hot zone.
 

Chas Tennis

G.O.A.T.
I read the virus is about 100-120 nm, or 0.1 micron. It is more than likely not flying around that small, and is attached to other moisture and particles making it bigger. I saw one study that measured only 42% of flu particles from measured coughs were under 1 micron, and influenza is listed as 90-120 nm. I assume it is rare that this virus particle will be around 0.3 micron. This virus, from what I can make of it, is basically SARS round two. SARS was clearly airborne over hospital room distances, and they proved it with capture devices. Filter theory is pretty complicated, but every mask material I looked up that was put against virus particles, performed better than its rating. N95's only let like 0.5-2% of 0.1 micron through. N100 were 99.98-99.998% against 100 nm. There are alot of idiots just parroting what they hear on tv about N95 are useless, or even harmful. Chances are, if you are using N95 or better, and it seals well, you should be ok. I have P100 and a gas mask, but I still wouldn't unnecessarily test it by going into a hot zone.
If you come across that virus size information again please, post the link. Also, the N95 and N100 filtering vs particle size measurements.

From your information, it would seem that the health care workers should be using N100 masks and that massive filtering with large filters might be applied in all crowded areas to catch much of the 0.1 micron particles. The difficulty with fine filtering is the cost of the fine filters and the finer they are the quicker they clog. But they can also be used with less fine filters in series to reduce the clogging the finest filter. It seems that the filters are over priced and the cost could probably be much lower.

It seems that the time for fine filtering in airplanes is now. Do airplanes have filtering? Here's some information -

I read some strange sounding information on filters, not masks. As we would expect, the catch percentage was going down as the particle size got smaller and produced the 99.97% type filtering data vs particle size. But then as the particle size got even smaller, the capture rate somehow increased again. That sounded too good to be true and I can't account for that claimed spec. Maybe it was related to static electricity, that some filters use, that might deflect and capture smaller particles. ??

Ultra-Violet radiation can kill viruses, I guess, but UV can also produce ozone which is bad for the lungs.
 
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sureshs

Bionic Poster
My thread on this seems to have been deleted. I think there are certain people worried about the impact to tennis industry sales.
 

Chas Tennis

G.O.A.T.
On a forum format, a lot of people searching for evidence and supplying links can move things in the right direction. Often there are disagreements and then the readers can consider the evidence presented by opposing sides. The forum format is an effective way for quickly presenting evidence from both sides of an issue. Of course, in a 'cut and paste' information environment it can take longer to get to the truth..........
 
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Tmano

Professional
I honestly I did not play any tennis in the last 3 weeks at the UW tennis facility because kind of freaked by the virus. There are so many students from anywhere!
It sucks!
 

Kobble

Hall of Fame
If you come across that virus size information again please, post the link. Also, the N95 and N100 filtering vs particle size measurements.

From your information, it would seem that the health care workers should be using N100 masks and that massive filtering with large filters might be applied in all crowded areas to catch much of the 0.1 micron particles. The difficulty with fine filtering is the cost of the fine filters and the finer they are the quicker they clog. But they can also be used with less fine filters in series to reduce the clogging the finest filter. It seems that the filters are over priced and the cost could probably be much lower.

It seems that the time for fine filtering in airplanes is now. Do airplanes have any filtering?

I read some strange sounding information on filters, not masks. As we would expect, the catch percentage was going down as the particle size got smaller and produced the 99.97% type filtering data vs particle size. But then as the particle size got even smaller, the capture rate somehow increased again. That sounded too good to be true and I can't account for that claimed spec. Maybe it was related to static electricity, that some filters use, that might deflect and capture smaller particles. ??

Ultra-Violet radiation can kill viruses, I guess, but UV can also produce ozone which is bad for the lungs.
Seems like the size is not something that is easily agreed on
Claims 120 nm - https://www.pptaglobal.org/media-and-information/ppta-statements/1055-2019-novel-coronavirus-2019-ncov-and-plasma-protein-therapies
Claims 70- 80 nm - https://jkms.org/DOIx.php?id=10.3346/jkms.2020.35.e84

Viruses vs. Filters
N95, N99 - https://academic.oup.com/annweh/article/52/5/385/167089
N95 - https://academic.oup.com/annweh/article/52/3/177/312528
N95 and P100 - https://www.ncbi.nlm.nih.gov/pubmed/24011377

Those particle penetration curves are reasonably accurate, but not always uniform. They can vary based on flow rate and filter type (static charge, etc.) There are some curves which have a rise in penentration as particles shrink from 0.1 to 0.04 microns. I definitely believe penetration rises below a certain level because particle filters do not protect against vapors, or even air from getting through. All tests show good filtration for anything that would be a virus size or bigger, though.

FIlter fiber theory (basic) -https://www.youtube.com/watch?v=f62tNfKWb38&list=PLEQSJUPSu3vmVNfVyqq_0WpJ2UQ2PrV5U&index=1
 

Chas Tennis

G.O.A.T.
There have been a few comments on the internet about smoking and Covid-19.

This publication describes smoking and lung cancer in China and has some information on the incidence of smokers in China and the percentage that are men and women.

If Covid-19 mortality depends on smoking then we should see some indication because this publication says that

"Abstract
China is in the midst of a lung cancer epidemic on an unprecedented scale. In 2015, there were an estimated 733,000 new lung cancer cases (17% of total cancer incidence) and 610,000 deaths (21.7% of total cancer mortality) in China. Lung cancer is the most commonly diagnosed cancer and the leading cause of cancer mortality in China. Tobacco smoke exposure is the primary factor driving current lung cancer trends. In 2015, smoking prevalence was 27.7% (52.1% among men and 2.7% among women). China has taken substantial steps to control tobacco use in recent years, including 19 cities implementing comprehensive smoke free laws and expansion of cessation services. However, significant challenges remain in order to meet the 2030 Healthy China goal of reducing smoking prevalence to 20%. In particular, ongoing attention is needed to continuing to control secondhand smoke exposure, to further enhance smoking cessation services, and to address novel alternative nicotine delivery devices (ANDS)."

".....In 2015, smoking prevalence was 27.7% (52.1% among men and 2.7% among women)............"
I believe that the small percentage of women smokers should show up in the number of Covid-19 deaths in China, male and female, if smoking is a significant factor.
 
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Chas Tennis

G.O.A.T.
Electron Microscope Pictures of the Covid-19 Virus. Click on the picture to see a series of other virus pictures. The pictures are followed by an informative video discussing vaccine development.
https://flic.kr/p/2ivepiE
Details of what is going on prior to these images would be in the original publication.
 
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Kobble

Hall of Fame
In Denmark we only have 4 registred cases of Corona Virus (120 persons are on observations and isolated at home). Our National Health Authority just announced that they estimate that about 10-15% of the population would be contaminated within the next 4 month.

I guess that you can call that out of control.
I was plannning on leaving the states since last year, but got stuck here due to family deaths and people playing games with money. At this point, I am not sure what to do. No way I can sell my house in time, and to get food in another country might be hard at this point. I am just going to have to wait this out, I guess. It sucks being stuck in a situation caused by politics you never believed in.
 

Edhead-Fedhead

Hall of Fame
Do you have any links for that piece of information. I have only recently heard that during this coronavirus epidemic. ?

I would guess that most retail masks are sold for dust from miscellaneous sources like tools.

Besides if they reduce virues getting out why shouldn't they help prevent them from getting in also?
What BBender716 said is what I have heard from numerous sources. There are special protective masks/respirators to help protect healthcare workers, but they are not readily available for the general public.
 

beltsman

Legend
In Denmark we only have 4 registred cases of Corona Virus (120 persons are on observations and isolated at home). Our National Health Authority just announced that they estimate that about 10-15% of the population would be contaminated within the next 4 month.

I guess that you can call that out of control.
Really? 10-15% would be insanely bad. Do you have a link?
 

Bender

G.O.A.T.
Do you have any links for that piece of information. I have only recently heard that during this coronavirus epidemic. ?

I would guess that most retail masks are sold for dust from miscellaneous sources like tools.

Besides if they reduce virues getting out why shouldn't they help prevent them from getting in also?
TBH I think it's mostly a narrative being told to stop panic buying, which as you may have read has caused shortages for people who desperately need them, like medical professionals.

If you have a compromised immune system, one of the first things doctors will tell you is to wear a mask to prevent catching contagious diseases like the cold and flu. Since COVID-19 seems to spread in a similar way, I doubt masks are as useless as they say, and I remember seeing an article somewhere that even the worst of masks may lower the chances of infection by up to 35 odd percent.

Edit: I think this is the link (old article but nonetheless)


 

Chas Tennis

G.O.A.T.
This information concerns the history of the Covid 19 epicdemic in China. I did not appreciate that the epidemic had peaked in new cases per day in January 2020 (check my conclusion as I'm just now reading this). The rate of spread of the epidemic apparently has been slowed by the Chinese measures. Wuhan has 11.8 million people. So the great majority of people in that city have not been infected.

China has slowed the spread of Covid-19 virus. Regarding masks their policy or behavior is, if you go out you wear a mask.

Here is a World Health Organization (WHO) report.



If anyone finds other graphs of new cases of Covid-19 in China VS time, the history of the epidemic, please post.
 
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onehandbh

Legend
There have been ZERO deaths in the U.S. while thousands have died from the flu.
Stay calm. Do not panic. Take the same precautions as for the flu (provided you are otherwise healthy and not in high risk group).

We need to keep a proper perspective on this.
Sadly, there have been deaths in the U.S. from the latest Coronavirus.
Hopefully, the U.S. can keep it from spreading too much, as there are quite a large number of people there with pre-existing health conditions such as diabetes.
 

sureshs

Bionic Poster
The virus will stop spreading in the US once Nadal arrives at Indian Wells. His topspin balls create powerful vortices which will kill the virus.
 
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