Why do you think that you are better qualified to determine findings from their study? They concluded: " Our results indicate that surgical face masks could prevent transmission of human coronaviruses and influenza viruses from symptomatic individuals. "
On Sun, Jul 19, 2020 at 4:36 PM Meade Dillon via Mercedes < mercedes@okiebenz.com> wrote: > https://www.nature.com/articles/s41591-020-0843-2 > > Read the whole study at least through the Discussion, don't stop at the > abstract. > > "Some health authorities recommend that masks be worn by ill individuals to > prevent onward transmission (source control)4 > <https://www.nature.com/articles/s41591-020-0843-2#ref-CR4>,8 > <https://www.nature.com/articles/s41591-020-0843-2#ref-CR8>. Surgical face > masks were originally introduced to protect patients from wound infection > and contamination from surgeons (the wearer) during surgical procedures, > and were later adopted to protect healthcare workers against acquiring > infection from their patients. However, most of the existing evidence on > the filtering efficacy of face masks and respirators comes from in vitro > experiments with nonbiological particles9 > <https://www.nature.com/articles/s41591-020-0843-2#ref-CR9>,10 > <https://www.nature.com/articles/s41591-020-0843-2#ref-CR10>, which may > not > be generalizable to infectious respiratory virus droplets. There is little > information on the efficacy of face masks in filtering respiratory viruses > and reducing viral release from an individual with respiratory infections8 > <https://www.nature.com/articles/s41591-020-0843-2#ref-CR8>, and most > research has focused on influenza11 > <https://www.nature.com/articles/s41591-020-0843-2#ref-CR11>,12 > <https://www.nature.com/articles/s41591-020-0843-2#ref-CR12>. > > Here we aimed to explore the importance of respiratory droplet and aerosol > routes of transmission with a particular focus on coronaviruses, influenza > viruses and rhinoviruses, by quantifying the amount of respiratory virus in > exhaled breath of participants with medically attended ARIs and determining > the potential efficacy of surgical face masks to prevent respiratory virus > transmission." > > Key parts from the Discussion: > > " Among the samples collected without a face mask, we found that the > majority of participants with influenza virus and coronavirus infection did > not shed detectable virus in respiratory droplets or aerosols, whereas for > rhinovirus we detected virus in aerosols in 19 of 34 (56%) participants > (compared to 4 of 10 (40%) for coronavirus and 8 of 23 (35%) for > influenza). For those who did shed virus in respiratory droplets and > aerosols, viral load in both tended to be low (Fig. 1 > <https://www.nature.com/articles/s41591-020-0843-2#Fig1>). Given the high > collection efficiency of the G-II (ref. 19 > <https://www.nature.com/articles/s41591-020-0843-2#ref-CR19>) and given > that each exhaled breath collection was conducted for 30 min, this might > imply that prolonged close contact would be required for transmission to > occur, even if transmission was primarily via aerosols, as has been > described for rhinovirus colds." > > " The major limitation of our study was the large proportion of > participants with undetectable viral shedding in exhaled breath for each of > the viruses studied. We could have increased the sampling duration beyond > 30 min to increase the viral shedding being captured, at the cost of > acceptability in some participants. An alternative approach would be to > invite participants to perform forced coughs during exhaled breath > collection12 <https://www.nature.com/articles/s41591-020-0843-2#ref-CR12>. > However, it was the aim of our present study to focus on recovering > respiratory virus in exhaled breath in a real-life situation and we > expected that some individuals during an acute respiratory illness would > not cough much or at all." > > Here in South Carolina, we have about 2000 new cases reported. Let's say > for each person with a positive case, there's another 10 that are infected, > so perhaps there are 20,000 people out there in South Carolina with Wuhan > Red Death (WRD). State population is about 5,000,000 which means that > about 0.4% of the population MIGHT be walking around with WRD. So if I go > to Costco, and there are about 200 people in the store, maybe one of them > is infected. > > I'm about 50, in good health with none of the health conditions that > "experts" think might make me more likely to get seriously ill or die from > this, so I'm not too worried. If there is one person that is sick, and for > 30 minutes of them breathing next to me there's about a 6 in 10 chance that > they aren't expelling any virii in their breath, and they don't cough on > me, then neither they nor I really need a mask, right? I don't stay next > to anyone for 30 minutes in any store that I go to, generally I'm in and > out in 30 minutes or less. > ------------- > Max > Charleston SC > _______________________________________ > http://www.okiebenz.com > > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > -- OK Don "Whenever you find yourself on the side of the majority, it is time to pause and reflect." Mark Twain “Basic research is what I’m doing when I don’t know what I am doing.” Wernher Von Braun 2013 F150, 18 mpg 2017 Subaru Legacy, 30 mpg 1957 C182A, 12 mpg - but at 150 mph! _______________________________________ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
