[ARC5] AB5S Kung Flu Update, 13 June - source?

Sun Jun 14 16:19:02 EDT 2020

...and this illustrates why choral singing is unfortunately one of the 
best ways to make others sick. This is a drag for me, a choral singer 
the last 63 years.

Stay healthy,

Scott Robinson

> On 6/14/2020 11:54 AM, Michael Hanz wrote:
>> That pretty much aligns with my view, Scott, with the addition of 
>> information from an interesting study about aerosols produced by 
>> simply "normal" talking, reported at 
>> https://www.nytimes.com/2020/05/14/health/coronavirus-infections.html 
>> (The National Academy of Sciences detailed report is at 
>> https://www.pnas.org/content/117/22/11875 ).
>>
>> The gist of the article was:
>> "To see how many droplets are produced during normal conversation, 
>> researchers at the National Institute of Diabetes and Digestive and 
>> Kidney Diseases and the University of Pennsylvania, who study the 
>> kinetics of biological molecules inside the human body, asked 
>> volunteers to repeat the words “stay healthy” several times. While the 
>> participants spoke into the open end of a cardboard box, the 
>> researchers illuminated its inside with green lasers, and tracked 
>> bursts of droplets produced by the speaker.
>>
>> The laser scans showed that about 2,600 small droplets were produced 
>> _per second_ while talking. When researchers projected the amount and 
>> size of droplets produced at different volumes based on previous 
>> studies, they found that speaking louder could generate larger 
>> droplets, as well as greater quantities of them.
>>
>> Although the scientists did not record speech droplets produced by 
>> people who were sick, previous studies have calculated exactly how 
>> much coronavirus genetic material can be found in oral fluids in the 
>> average patient.  Based on this knowledge, the researchers estimated 
>> that a single minute of loud speaking could generate at least 1,000 
>> virus-containing droplets."
>>
>> Here's a picture of the test setup:
>>
>>
>> That makes it even more than a courtesy to wear a mask, especially 
>> since most coronavirus spreaders aren't even aware when they are in 
>> the early stages of their infection.  The cloth masks are indeed not 
>> perfect, but they are only intended to reduce the frequency of the 
>> much larger droplets, not the much smaller virus which is attached to 
>> them.
>>
>> - Mike  KC4TOS
>>
>>
>> On 6/14/2020 2:00 PM, Scott Johnson wrote:
>>> I consider the primary reason for masks, or bandanas, or whatever, 
>>> not to
>>> protect yourself, but to protect other from you.  It is a courtesy, 
>>> if you
>>> sneeze, cough, or slobber when you talk, it effectively prevents the 
>>> aerosol
>>> from going further than the fabric.  Not wearing anything in 
>>> proximity to
>>> the public identifies one as  careless and reckless.  If you are in a 
>>> high
>>> risk group, and truly worried about your own safety, then you 
>>> shouldn't be
>>> exposing yourself needlessly.  I have heard so many opinions, some 
>>> that are
>>> diametrically opposed, and all from supposed experts.  Don't care to 
>>> hear
>>> any more. Common sense coupled with common decency should prevail.  
>>> BTW, one
>>> of my engineers did a CFD model in Solidworks of a sneeze in a room with
>>> closed loop HVAC.  It propogates and dissipates pretty much like a fart.
>>>
>>> Scott V. Johnson W7SVJ
>>> 5111 E. Sharon Dr.
>>> Scottsdale, AZ 85254-3636
>>> H (602) 953-5779
>>> C (480) 550-2358
>>> scottjohnson1 at cox.net
>>> scott.johnson at ieee.org
>>>
>>> -----Original Message-----
>>> From:arc5-bounces at mailman.qth.net  <arc5-bounces at mailman.qth.net>  On 
>>> Behalf
>>> Of Hubert Miller
>>> Sent: Saturday, June 13, 2020 11:21 PM
>>> To:arc5 at mailman.qth.net
>>> Subject: Re: [ARC5] AB5S Kung Flu Update, 13 June - source?
>>>
>>> Generally good advice, but I question the non-cough non-sneeze 26 foot
>>> business, no matter what your doctor said.
>>> I have read several articles in the New York Times precisely on this
>>> question, and those articles are well informed, very well informed,
>>> frequently updated. Ask your doctor his source for his information. I 
>>> recall
>>> now they also had an article comparing actual effectiveness of different
>>> kinds of masks, both homemade and commercial, and gave actual numbers
>>> compared to N95, and what thickness required even with homemade.
>>> Also, masks are dry material, so what is your informed reckoning of 
>>> how long
>>> virus lives on them ?
>>> As for health professionals dying despite masks, well, you would have to
>>> know the extent of their exposure and their full suiting equipment to 
>>> assign
>>> this to mask inefficiency.
>>> Don't forget UV exposure either, to kill virus. These parameters apply
>>> outside also.
>>> I found Elderberry anything to be pretty much sold out locally last 
>>> time I
>>> shopped, but I'll take another look in the next days.
>>> -Hue Miller
>>>
>>>
>>>
>>>
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>>
>> -- 
>> Michael Hanz - KC4TOS
>>
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