[Libs-Or] face shields

Mon Aug 17 19:29:55 PDT 2020

To supplement Matthew’s list, this Lancet source is pro-eye protection (defined as visors, faceshields, or goggles) :

Physical distancing, face masks, and eye protection for prevention of COVID-19 <https://doi.org/10.1016/S0140-6736(20)31183-1> 

C Raina MacIntyre, Quanyi Wang.

The Lancet, Volume 395, Issue 10242, Pages 1950 – 1951, June 27 2020.

Published: June 01, 2020               DOI: https://doi.org/10.1016/S0140-6736(20)31183-1

It’s a commentary and concise summary on a lengthy study from that same issue:

Physical distancing, face masks, and eye protection to prevent person-to-person transmission of SARS-CoV-2 and COVID-19: a systematic review and meta-analysis. <https://www.sciencedirect.com/science/article/pii/S0140673620311429> 

Derek K Chu, Elie A Akl, Stephanie Duda, et al.

The Lancet, Volume 395, Issue 10242, 2020, Pages 1973-1987, June 27 2020.

Published: June 01, 2020               DOI: https://doi.org/10.1016/S0140-6736(20)31142-9 .

(http://www.sciencedirect.com/science/article/pii/S0140673620311429)

Abstract: Summary

Background

Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) causes COVID-19 and is spread person-to-person through close contact. We aimed to investigate the effects of physical distance, face masks, and eye protection on virus transmission in health-care and non-health-care (eg, community) settings.

Methods

We did a systematic review and meta-analysis to investigate the optimum distance for avoiding person-to-person virus transmission and to assess the use of face masks and eye protection to prevent transmission of viruses. We obtained data for SARS-CoV-2 and the betacoronaviruses that cause severe acute respiratory syndrome, and Middle East respiratory syndrome from 21 standard WHO-specific and COVID-19-specific sources. We searched these data sources from database inception to May 3, 2020, with no restriction by language, for comparative studies and for contextual factors of acceptability, feasibility, resource use, and equity. We screened records, extracted data, and assessed risk of bias in duplicate. We did frequentist and Bayesian meta-analyses and random-effects meta-regressions. We rated the certainty of evidence according to Cochrane methods and the GRADE approach. This study is registered with PROSPERO, CRD42020177047.

Findings

Our search identified 172 observational studies across 16 countries and six continents, with no randomised controlled trials and 44 relevant comparative studies in health-care and non-health-care settings (n=25 697 patients). Transmission of viruses was lower with physical distancing of 1 m or more, compared with a distance of less than 1 m (n=10 736, pooled adjusted odds ratio [aOR] 0·18, 95% CI 0·09 to 0·38; risk difference [RD] −10·2%, 95% CI −11·5 to −7·5; moderate certainty); protection was increased as distance was lengthened (change in relative risk [RR] 2·02 per m; pinteraction=0·041; moderate certainty). Face mask use could result in a large reduction in risk of infection (n=2647; aOR 0·15, 95% CI 0·07 to 0·34, RD −14·3%, −15·9 to −10·7; low certainty), with stronger associations with N95 or similar respirators compared with disposable surgical masks or similar (eg, reusable 12–16-layer cotton masks; pinteraction=0·090; posterior probability >95%, low certainty). Eye protection also was associated with less infection (n=3713; aOR 0·22, 95% CI 0·12 to 0·39, RD −10·6%, 95% CI −12·5 to −7·7; low certainty). Unadjusted studies and subgroup and sensitivity analyses showed similar findings.

Interpretation

The findings of this systematic review and meta-analysis support physical distancing of 1 m or more and provide quantitative estimates for models and contact tracing to inform policy. Optimum use of face masks, respirators, and eye protection in public and health-care settings should be informed by these findings and contextual factors. Robust randomised trials are needed to better inform the evidence for these interventions, but this systematic appraisal of currently best available evidence might inform interim guidance.

Funding

World Health Organization.

-----------------------------------------

Perry Stokes | Library Director / Reference Librarian

Baker County Library District | 2400 Resort St | Baker City, OR 97814

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From: Libs-Or <libs-or-bounces at omls.oregon.gov> On Behalf Of Nelson, Julie
Sent: Monday, August 17, 2020 3:52 PM
To: Alan Cordle Villegas <acordle at pcc.edu>
Cc: libs-or at listsmart.osl.state.or.us; Jan Alderman <jalderman at summitlc.org>
Subject: Re: [Libs-Or] face shields

All of this reminds me of an SRA article I read back in the sixth grade.  I loved those science facts.  It said a sneeze can linger in the air for 30-45 minutes after the sneeze, because the force makes it a super fine mist.  Growing up on the southern Oregon coast, watching fog, triggered that mist concept in my mind.  The idea that you can walk into a sneeze you never even knew happened, is mind boggling.  

Myth Busters has done some interesting episodes on the spread of germs.  The sneeze in particular.  

I have a nice pair of safety shield glasses to go over my glasses.  The way they close up makes my glasses get less steamed up from my mask.  

Please stay safe and stay healthy.

On Mon, Aug 17, 2020, 2:44 PM Alan Cordle Villegas <acordle at pcc.edu <mailto:acordle at pcc.edu> > wrote:

I appreciate those sources too, Matthew. Thank you. Personally, I would not rely on a shield now that they've determined that coronavirus is in aerosols, floating significantly farther than six feet away from the source.

https://www.nytimes.com/2020/08/11/health/coronavirus-aerosols-indoors.html

*****
Alan Cordle Villegas
He/Him/His/El

On Mon, Aug 17, 2020 at 2:27 PM Adam Carlson <Adam.Carlson at mcminnvilleoregon.gov <mailto:Adam.Carlson at mcminnvilleoregon.gov> > wrote:

Thank you for finding those sources Matthew, 

If anyone knows of any study that has looked at the effectiveness of face masks vs face shields, please share. I realize not all face shields or masks are created equal. But it would be good to have something that compares the two in the same study. I get the impression that face masks are more effective. I think most people would see the sense in that more of the mouth and nose are contained. But just how much more effective a mask is would be nice to learn about. 

Adam Carlson

Circulation Supervisor

McMinnville Public Library

(503) 435-5556

From: Libs-Or <libs-or-bounces at omls.oregon.gov <mailto:libs-or-bounces at omls.oregon.gov> > On Behalf Of Matthew Baiocchi
Sent: Monday, August 17, 2020 10:21 AM
To: Alan Cordle Villegas <acordle at pcc.edu <mailto:acordle at pcc.edu> >; Jan Alderman <jalderman at summitlc.org <mailto:jalderman at summitlc.org> >; libs-or at listsmart.osl.state.or.us <mailto:libs-or at listsmart.osl.state.or.us> 
Subject: Re: [Libs-Or] face shields

This message originated outside of the City of McMinnville.

  _____  

I had to do some research on this last week. Here's what I found out. Unfortunately it seems to depend who you listen to.

Pro face shields:

- https://govstatus.egov.com/or-oha-face-coverings (State of Oregon  mentions it as a requirement)

- https://www.co.lincoln.or.us/hhs/page/face-covering-directive (Lincoln County says they're good (via state))

- https://jamanetwork.com/journals/jama/fullarticle/2765525 (JAMA article saying they help)

- https://osha.oregon.gov/Documents/COVID19-Face-Covering-Advisory-Memo.pdf (Oregon OSHA recommends)

Anti face shields:

- https://www.cdc.gov/coronavirus/2019-ncov/prevent-getting-sick/cloth-face-cover-guidance.html (CDC says face shields bad)

- https://medical.mit.edu/covid-19-updates/2020/07/face-shield-instead-mask (MIT Medical says no)

Waffling:

- https://health.clevelandclinic.org/will-a-face-shield-protect-you-from-the-coronavirus/ <https://health.clevelandclinic.org/will-a-face-shield-protect-you-from-the-coronavirus>  (Cleveland Clinic seems to be playing CYA)

- https://www.hopkinsmedicine.org/health/conditions-and-diseases/coronavirus/coronavirus-face-masks-what-you-need-to-know (Johns Hopkins says maybe)

- https://www.bbc.com/future/article/20200806-are-face-shields-effective-against-covid-19 (BBC says it depends)

- https://www.nytimes.com/article/face-shield-mask-california-coronavirus.html (NY Times: Ehhhhhhhhh)

Matthew Baiocchi

REFERENCE LIBRARIAN

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City of Lincoln City  |  Driftwood Public Library

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W: Driftwoodlib.org <http://Driftwoodlib.org>  | W: LincolnCity.org <http://LincolnCity.org> 

  _____  

From: Libs-Or <libs-or-bounces at omls.oregon.gov <mailto:libs-or-bounces at omls.oregon.gov> > on behalf of Alan Cordle Villegas <acordle at pcc.edu <mailto:acordle at pcc.edu> >
Sent: Monday, August 17, 2020 9:40 AM
To: Jan Alderman; libs-or at listsmart.osl.state.or.us <mailto:libs-or at listsmart.osl.state.or.us> 
Subject: Re: [Libs-Or] face shields 

Please note that shields are not recommended as a substitute for masks. I suppose there's nothing wrong with using them together. 

https://www.cdc.gov/coronavirus/2019-ncov/prevent-getting-sick/cloth-face-cover-guidance.html#face-shields

*****
Alan Cordle Villegas
He/Him/His/El

On Mon, Aug 17, 2020 at 8:46 AM Jan Alderman <jalderman at summitlc.org <mailto:jalderman at summitlc.org> > wrote:

Hi there,

I also wear eyeglasses.

Masks tend to have glasses fog up...This is the Faceshield I have found to be absolutely wonderful!! <https://www.amazon.com/gp/product/B08862CTDT/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1> https://www.amazon.com/gp/product/B08862CTDT/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

 These faceshields are sooo comfortable and fit right over my glasses!

It was so comfortable that I forgot I had it on and went to apply lip moisturizer and ended up getting it on the shield...LOL, wiped right off with no scratches.

No issue with fogging up either.

Pretty reasonably priced.

Let me know what you think :-)

On Wed, Aug 12, 2020 at 11:38 AM dan cawley via Libs-Or <libs-or at omls.oregon.gov <mailto:libs-or at omls.oregon.gov> > wrote:

Can anyone recommend a decent universal face shield?

Many of the staff wear eye glasses.  

Some reviews say the headband models are constricting.

Cheaper shields tend to scratch and/or fog up.

I haven't a clue where to begin...

Any and all suggestions welcomed.

thanks, 

dan @ seaside

Daniel D. Cawley

Seaside Public Library

1131 Broadway

Seaside, Oregon  97138

503.738.6742

www.seasidelibrary.org <http://www.seasidelibrary.org> 

-- 

Sincerely,

Mrs. Alderman

Jan Alderman

HS Educational Advisor A - F

Summit Learning Charter

503.630.5001 ext 2226

503.757.2554 cell

jalderman at summitlc.org <mailto:jalderman at summitlc.org> 

https://summitlc.zoom.us/j/8958259992

https://summitlc.zoom.us/my/alderman.homeroom

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