Masks – Protection against CV19

Michael Osterholm at CIDRAP, Center for Infectious Diseases Research and Policies at Univ. of Minnesota states that there is little to
no substantiated data//evidence that cloth and/or surgical masks will offer ex/inhalation protection against micro aerosol droplets
containing CV19.

However wearing these mask types can/does mitigate /divert larger droplets from sneezing/coughing individuals from being sprayed into the air.

The issue : asymptomatic/presymptomatic carriers exhale ~50 micro aerosol droplets/sec or 3000 droplets /min based upon normal breathing/exhalation patterns. If these individuals yell or sing they exhale/expel a larger volume of the air at increased air passage flow rates from the 6-8 liters of air/micro aerosol droplets contained in their lungs.

These micro aerosol droplets have been shown to travel up to 26 ft (MIT studies) from a source in an invisible gaseous cloud which can
remain suspended in the air for several hours depending upon air currents/turbulence/movement in a closed facility or room.

Venues like rallies, church choirs, and other mass gatherings, such as sporting events in closed facilities are prime opportunities for super spreader events and mass infections.

Brownian motion and electrostatic charges present in an environment/atmosphere/mask material may prevent some of these
micro aerosol droplets from being ex/inhaled by some mask wearers.

More qualified studies need to be conducted to verify percentage of protection from various mask material types.

These hypotheses/theories have been studied using N95-N100 masks which prevent 95-98% particles measuring 0.3 microns and larger
from being ex/inhaled. Virus particles measure ~0.08-0.17 microns.

There are scientific studies which have been performed and more studies which need to be performed.

No one , CDC, NIH, NIAD, WHO has all the answers because all studies have not been performed and data have not been
generated/determined/evaluated/peer reviewed.

Politics does get involved when the entire economy is shut down. However, we all need to approach this disease and it’s prevention with open minds and utilize the best available science we have at this time and practice utilizing hygiene and best available PPE for mitigating this virus.

I would also recommend fortifying our immune system by eating
proper foods, supplementing vitamins, minerals, enzymes, probiotics, exercising, getting a good night’s sleep, and reducing mental stress/anxiety.

Initial studies ( Nature/Science Articles) using table salt water impregnation into paper and cloth masks we’re shown to desiccate
virus particles upon contact with the dried salt mask and prevent
viral infection because the virus is stripped of essential fluids.

However, further studies need to be conducted on duration of exhaled breath and effect of total moisture accumulation over time on salt

Same with nano silver impregnation
and other possible anti viral disinfectants mask applications.

Let’s all try to practice patience, respect, and reserve judgments of others because of being in this extended quarantine and economic
recession together.

We can defeat this virus using science and safe logic but it will take time.

Excerpt Conclusion from CIDRAP MASK studies:
While this is not an exhaustive review of masks and respirators as source control and PPE, we made our best effort to locate and review the most relevant studies of laboratory and real-world performance to
inform our recommendations.

Results from laboratory studies of filter
and fit performance inform and support the findings in real-world settings.

Cloth masks are ineffective as source control and PPE, surgical masks have some role to play in preventing emissions from infected patients, and respirators are the best choice for protecting healthcare and other
frontline workers, but not recommended for source control.

These recommendations apply to pandemic and non-pandemic situations.

Leaving aside the fact that they are ineffective, telling the public to wear cloth or surgical masks could be interpreted by some to mean
that people are safe to stop isolating at home.

It’s too late now for anything but stopping as much person-to-person interaction as

Filter efficiency was measured across a wide
range of small particle sizes (0.02 to 1 µm) at
33 and 99 L/min.

N95 respirators had efficiencies greater than 95% (as expected).

For the entire range of particles tested, t-shirts had 10% efficiency, scarves 10% to 20%, cloth
masks 10% to 30%, sweatshirts 20% to 40%,
and towels 40%.

All of the cloth masks and materials had near zero efficiency at 0.3 µm, a particle size that easily penetrates into the lungs.4

Another study evaluated 44 masks, respirators, and other materials with similar methods and small aerosols (0.08 and 0.22 µm).

Medical masks exhibited 55% efficiency, general masks 38%, and handkerchiefs 2% (one layer) to 13% (four layers)

N95 FFR filter efficiency was greater than 95%.

homemade masks will have very low filter
efficiency (2% to 38%). Medical masks are
made from a wide range of materials, and
studies have found a wide range of filter
efficiency (2% to 98%), with most exhibiting
30% to 50% efficiency.6-12

Masks may confuse that message and give people a false sense of security.

If masks had been the solution in Asia, shouldn’t they have stopped the pandemic before it spread elsewhere?

Ways to best protect health workers:
We recommend that healthcare organizations follow US Centers for Disease Control and Prevention (CDC) guidance by moving first
through conventional, then contingency, and finally crisis scenarios to optimize the supply of respirators.

We recommend using the CDC’s burn rate calculator to help identify areas to reduce N95 consumption and working down the CDC checklist for a strategic approach to extend
N95 supply.

For readers who are disappointed in our recommendations to stop making cloth masks for themselves or healthcare workers, we
recommend instead pitching in to locate N95 FFRs and other types of respirators for healthcare organizations. Encourage your local or state government to organize and reach out to industries to locate
respirators not currently being used in the non-healthcare sector and coordinate donation efforts to frontline health workers.


Airborne Lifetime of Small Speech Droplets National Academy of Sciences

CV19 Super-spreader Events in 28 Countries

Salt Masks

Face Protection

The Risks- Know Them, Avoid Them

Mask Documentary Series

Published by enoch2345

Retired Biochemist with over 40 years of problem solving experience in oil, environmental, and toxicology.

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